USPP5335P - Elm tree called Regal - Google Patents
Elm tree called Regal Download PDFInfo
- Publication number
- USPP5335P USPP5335P US06/473,176 US47317683V US5335P US PP5335 P USPP5335 P US PP5335P US 47317683 V US47317683 V US 47317683V US 5335 P US5335 P US 5335P
- Authority
- US
- United States
- Prior art keywords
- ulmus
- elm
- regal
- sup
- tree
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 241001106462 Ulmus Species 0.000 title claims abstract description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims description 6
- 241001286670 Ulmus x hollandica Species 0.000 claims abstract description 6
- 201000010099 disease Diseases 0.000 claims abstract description 6
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 claims abstract description 6
- 244000058281 Ulmus pumila Species 0.000 description 11
- 241000051616 Ulmus minor Species 0.000 description 9
- 235000001547 Ulmus pumila Nutrition 0.000 description 6
- 238000011161 development Methods 0.000 description 6
- 230000018109 developmental process Effects 0.000 description 6
- 241000196324 Embryophyta Species 0.000 description 4
- 241000221671 Ophiostoma ulmi Species 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 230000006378 damage Effects 0.000 description 4
- 238000011081 inoculation Methods 0.000 description 4
- 241001149163 Ulmus americana Species 0.000 description 3
- 241000417365 Ulmus davidiana var. japonica Species 0.000 description 3
- 239000002054 inoculum Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 208000035240 Disease Resistance Diseases 0.000 description 2
- 240000007313 Tilia cordata Species 0.000 description 2
- 235000015450 Tilia cordata Nutrition 0.000 description 2
- 238000009395 breeding Methods 0.000 description 2
- 230000001488 breeding effect Effects 0.000 description 2
- 239000003415 peat Substances 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 230000001932 seasonal effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- HHBOUFYYHJJTNU-UHFFFAOYSA-N 1,3,6-thiadiazepane-2,7-dithione Chemical compound S=C1NCCNC(=S)S1 HHBOUFYYHJJTNU-UHFFFAOYSA-N 0.000 description 1
- 101100124609 Caenorhabditis elegans zyg-12 gene Proteins 0.000 description 1
- 241000221866 Ceratocystis Species 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- 241000533849 Gleditsia Species 0.000 description 1
- 102000011842 Serrate-Jagged Proteins Human genes 0.000 description 1
- 108010036039 Serrate-Jagged Proteins Proteins 0.000 description 1
- 241000736285 Sphagnum Species 0.000 description 1
- 241000082085 Verticillium <Phyllachorales> Species 0.000 description 1
- 241001123668 Verticillium dahliae Species 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 230000006578 abscission Effects 0.000 description 1
- 230000011681 asexual reproduction Effects 0.000 description 1
- 238000013465 asexual reproduction Methods 0.000 description 1
- 239000012677 causal agent Substances 0.000 description 1
- 238000013100 final test Methods 0.000 description 1
- 239000005556 hormone Substances 0.000 description 1
- 229940088597 hormone Drugs 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- SNICXCGAKADSCV-UHFFFAOYSA-N nicotine Chemical compound CN1CCCC1C1=CC=CN=C1 SNICXCGAKADSCV-UHFFFAOYSA-N 0.000 description 1
- 244000052769 pathogen Species 0.000 description 1
- 230000010152 pollination Effects 0.000 description 1
- 230000010076 replication Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000012882 rooting medium Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 244000201518 thornless honey locust Species 0.000 description 1
- 235000005703 thornless honey locust Nutrition 0.000 description 1
- 230000017260 vegetative to reproductive phase transition of meristem Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Definitions
- the present invention relates to a new and distinct variety of elm tree which is primarily distinguished by its high resistance to Dutch elm disease caused by Ceratocystis ulmi.
- the tree has remained symptomless in environments known to contain Verticillium dahliae, the causal agent of Verticillium wilt and appears to have limited susceptibility to black leaf spot disease caused by Stegophora ulmea.
- the tree is characterized by a columnar growth habit. Soon after planting it develops a strong central leader and the young plantings require a minimum of care to maintain a strong, upright (columnar) growth habit even when subjected to partial shading. Development of older plantings (10 years) in good sites suggests a long-lined, tidy tree which will perhaps reach heights of 20 m or greater.
- Foliation of the tree tends to be less dense than in the American elm with shade density resembling more closely trees such as thornless honey locust (Gleditsia triacanthas L.) or little leaf linden (Tilia cordata Mill.)
- the foliation and uniform upright growth characteristics of the tree allow full lawn development while maintaining an attractive columnar habit.
- the tree is an ideal candidate for planting in lines along drives or roads or in modern urban settings such as shopping malls and housing developments. Additionally, ice storms or severe winds have not produced injury in the parent tree under conditions causing large branch damage to U. pumila.
- New spring growth is varleys-green in color (R#31'm) (Ridgway, 1912). As leaves mature they change to a glossy, trichome-free dusky yellowish green (R#27'"m) and then to a mature forest green (R#29'm). The lower leaf surface is a deep, dull yellow greeen (R333"k). Trichomes on the lower leaves are not prominent and are confined to the bases of the veins. Mature leaves exposed to full sun are lanceolate-ovate, unequal at the base, acuminate at the tip, doubly serrate at the leaf margins, 8-12 cm long and 3 to b 6 cm wide. The short petioles vary from 0.8 to 1.5 cm in length. Fall leaf color is not distinctive and leaves tend to be retained through several early frosts before abscission occurs. This characteristic is common in certain sources of U. pumila growing in south-central Wisconsin.
- Young branches are a light brownish gray (light brown drab R#9""b) with green showing through the bark cracks.
- Prominent brownish lenticels 1.3 to b 1.5 cm long form an attractive pattern on the larger branches and lower trunk of young trees. This pattern is broken at regular (2 to 2.5 cm) intervals by horizontal brownish-green bark cracks.
- Mature bark is a dark neutral to mouse gray (R315""') and the substance bark is colored a light Sanford's brown (R#11k).
- Mature bark development occurs relatively late in the tree's life and only the basal portions of specimens at least 8-10 years old have appreciable mature bark development.
- the parent tree is located in a dense planting of elm sections, and these conditions have generally retarded its growth as contrasted with other plantings on more fertile urban planting sites.
- the parent tree began flowering sporadically at about 15 years of age, but trees from rooted cuttings have flowered in 10 years. Floral and seed characteristics are not distinctive and most closely resemble its strong U. carpinifolia ancestry.
- the "Regal” elm is derived from a controlled pollination of the "Commelin” elm N274 (U. ⁇ Hollandica vegeta ⁇ U. carpinifolia #1) with N215 (U. pumila ⁇ U. carpinifolia hoersholmiensis).
- the "Regal" elm cultivar can be propagated from root cuttings allowed to sprout in the greenhouse in moist sphagnum peat and sand. Hormone-treated sprouts can be transplanted as rooted cuttings after approximately 20 days in a perlite-peat rooting medium under fine intermittent mist. This is the preferred method of propagation. Bud-grafting has been of limited success on a range of root stocks.
Landscapes
- Breeding Of Plants And Reproduction By Means Of Culturing (AREA)
Abstract
An elm tree characterized by high resistance to the Dutch elm disease.
Description
The present invention relates to a new and distinct variety of elm tree which is primarily distinguished by its high resistance to Dutch elm disease caused by Ceratocystis ulmi. The tree has remained symptomless in environments known to contain Verticillium dahliae, the causal agent of Verticillium wilt and appears to have limited susceptibility to black leaf spot disease caused by Stegophora ulmea.
The tree is characterized by a columnar growth habit. Soon after planting it develops a strong central leader and the young plantings require a minimum of care to maintain a strong, upright (columnar) growth habit even when subjected to partial shading. Development of older plantings (10 years) in good sites suggests a long-lined, tidy tree which will perhaps reach heights of 20 m or greater.
Foliation of the tree tends to be less dense than in the American elm with shade density resembling more closely trees such as thornless honey locust (Gleditsia triacanthas L.) or little leaf linden (Tilia cordata Mill.)
The foliation and uniform upright growth characteristics of the tree allow full lawn development while maintaining an attractive columnar habit. Thus the tree is an ideal candidate for planting in lines along drives or roads or in modern urban settings such as shopping malls and housing developments. Additionally, ice storms or severe winds have not produced injury in the parent tree under conditions causing large branch damage to U. pumila.
New spring growth is varleys-green in color (R#31'm) (Ridgway, 1912). As leaves mature they change to a glossy, trichome-free dusky yellowish green (R#27'"m) and then to a mature forest green (R#29'm). The lower leaf surface is a deep, dull yellow greeen (R333"k). Trichomes on the lower leaves are not prominent and are confined to the bases of the veins. Mature leaves exposed to full sun are lanceolate-ovate, unequal at the base, acuminate at the tip, doubly serrate at the leaf margins, 8-12 cm long and 3 to b 6 cm wide. The short petioles vary from 0.8 to 1.5 cm in length. Fall leaf color is not distinctive and leaves tend to be retained through several early frosts before abscission occurs. This characteristic is common in certain sources of U. pumila growing in south-central Wisconsin.
Apical dominance is very strong and results in limited side branching on the developing shoot of the current season's growth. Current season side branching is usually restricted to short spurs which continue subdominant growth the following season. This results in the stiff, upright growth and resulting light density foliage.
Young branches are a light brownish gray (light brown drab R#9""b) with green showing through the bark cracks. Prominent brownish lenticels 1.3 to b 1.5 cm long form an attractive pattern on the larger branches and lower trunk of young trees. This pattern is broken at regular (2 to 2.5 cm) intervals by horizontal brownish-green bark cracks. Mature bark is a dark neutral to mouse gray (R315""') and the substance bark is colored a light Sanford's brown (R#11k). Mature bark development occurs relatively late in the tree's life and only the basal portions of specimens at least 8-10 years old have appreciable mature bark development.
The parent tree is located in a dense planting of elm sections, and these conditions have generally retarded its growth as contrasted with other plantings on more fertile urban planting sites. The parent tree began flowering sporadically at about 15 years of age, but trees from rooted cuttings have flowered in 10 years. Floral and seed characteristics are not distinctive and most closely resemble its strong U. carpinifolia ancestry.
The accompanying photographs show a specimen tree of the new variety in winter and in full foliage. The specimen shown is approximately nine years old and has an approximate height of 5 meters and an approximate diameter of 20 centimeters. The columnar growth habit is readily seen from the photographs. There is no tendency for the branches nearer the base of the tree to spread and branches emanating from the trunk tend to remain relatively uniform in size.
The "Regal" elm is derived from a controlled pollination of the "Commelin" elm N274 (U.×Hollandica vegeta×U. carpinifolia #1) with N215 (U. pumila×U. carpinifolia hoersholmiensis).
The hardiness (survival in Wisconsin winters) and disease resistance may be attributed in part to its 25% U. pumila ancestry as well as the northern (Denmark) origin of its U. carpinifolia hoersholmiensis grandfather.
The "Regal" elm cultivar can be propagated from root cuttings allowed to sprout in the greenhouse in moist sphagnum peat and sand. Hormone-treated sprouts can be transplanted as rooted cuttings after approximately 20 days in a perlite-peat rooting medium under fine intermittent mist. This is the preferred method of propagation. Bud-grafting has been of limited success on a range of root stocks.
Methods for screening elm introductions and breeding progeny for DED resistance have been previously described (Smalley and Kais, 1966, in H. D. Gerold et al (eds.) Breeding Pest Resistant Trees, Pergamon Press, New York, pp. 279-292; Lester and Smalley, I.U.F.R.O. Genetics-SABARAO Joint Symposia, Tokyo, 1972, C-5(V):1-10). In general, seedlings are grown for one year in out-door seedbeds, transplanted into field locations the second season, maintained under clean cultivation, and artificially inoculated with Certocystis ulmi in the 3rd and 4th year. Initial screening trials of plants from the Dutch seed lots from which "Regal" was derived utilized 10-15 different Wisconsin isolates of the pathogens. Trees were inoculated in one-year-old wood in the tree's upper crown and the inoculum contained approximately 106 spores/ml. Survivors of this procedure were re-inoculated in subsequent years. As a final test (called the seasonal susceptibility test), selected resistant clones were clonally propagated in large numbers, grown in randomized field plants for one or two years, and different individuals of each clone were inoculated at 10 different times during the growing season (Table 1). In this test, the inoculum consisted of a mixed conidial suspension from 10 different isolates of the fungus from different North American locations. Observations on disease development were then recorded periodically through the year following inoculation. The cultivar herein described, named "Regal", possessed superior resistance to C. ulmi as shown in Tables 1 and 2.
TABLE 1
______________________________________
Seasonal susceptibility of selected elm clones to Dutch elm disease.
Percent crown damage at final reading (7/17/74).sup.ab
Clone
Elm species.sup.c
Number 1973 dates of inoculation
______________________________________
5/17 5/24 5/31 6/7 6/17
______________________________________
Ulmus americana
185-2 22.2 0 29.4 0 0
185-4 33.3 62.5 33.3 41.3 11.0
Ulmus pumila 44-26 0 0 0 0 0
× 44-27 0 2.5 0 0.1 0
Ulmus japonica
Ulmus hollandica
5-2 82.0 83.8 90.5 25.5 38.8
×
Ulmus pumila
Ulmus carpinifolia
134-2 6.0 11.1 12.5 0.1 8.3
380-1 0.2 0 0 0 0
Ulmus pumila 196-5 0 0 0 0 0
× 196-6 1.4 0 9.5 3 23.3
Ulmus carpinifolia
196-7 0 13 10.0 15.5 16
196-8 0.4 0 0 1.3 0
Ulmus (complex.sup.c
228-5 0/3 0/6 0/3 0/3 0/4
hybrid) `Regal`
______________________________________
6/21 6/28 7/5 7/19 8/2
______________________________________
Ulmus americana
185-2 0 0 0 0 0
185-4 0 26.7 0 0 0
Ulmus pumila 44-26 0 0 0 0 0
× 44-27 0 0 0 0.1 0
Ulmus japonica
Ulmus hollandica
5-2 36.5 13.2 26.7 14.4 7.5
×
Ulmus pumila
Ulmus carpinifolia
134-2 12.5 0 18.7 0.4 16.7
380-1 1.0 0 0.2 0 0.2
Ulmus pumila 196-5 0 0.1 0.6 0.8 0
× 196-6 31.8 7.4 10.0 0.5 1.3
Ulmus carpinifolia
196-7 11.3 0 1.7 0.3 0
196-8 0 1.3 1.5 1.3 0.6
Ulmus (complex.sup.c
228-5 0/6 0/1 0/6 0/4 0/5
hybrid) `Regal`
______________________________________
.sup.a Elm clones derived from trees previously symptomless following one
or more inoculations with Wisconsin strains of Ceratocystis
.sup.b Mixed inoculum from isolates of C. ulmi from Wisconsin, Kansas,
Massachusetts, Illinois, Nebraska, Minnesota, New York, Conneticut, and
Maine.
.sup.c Trees planted as rooted cuttings in 1971, 3 plants per clone per
block, 15 clones per block, and 40 blocks (some clones incompletely
represented in blocks because of transplant mortality or shortage of
plants). Not all clones in the study are shown.
TABLE 2
______________________________________
Response of elm clones to inoculation in the field with an
aggressive and a nonaggressive isolate of Ceratocystis ulmi
and their single ascospore progeny.
Clone Crown damage (%).sup.a
Elm num- Ascospore lines Parental
species
ber 1 2 3 4 5 6 7 10 11 99.sup.b
116.sup.c
______________________________________
Ulmus 412-1 48 44 83 91 33 81 81 -- -- 80
97
ameri- 411-3 -- 27 78 78 -- 84 78 32 -- 95 99
cana
Ulmus 44-11.sup.d 0 0 0 0 0 0 0 0 0 0 0
pumila 44-26 0 0 0 0 0 0 2 -- 2 2 0
× 44-27 0 0 0 0 0 0 0 0 0 0 0
Ulmus
japon-
ica
Ulmus 5-2 14 0 1 1 0 0 33 1 -- 67 2
hol- 5-2 2 0 5 0 1 -- -- -- -- 7 6
landica
×
Ulmus
pumila
Ulmus 368-2 37 0 19 25 0 15 -- -- -- 62 32
carpini- 368-8 19 0 14 -- -- -- -- -- -- 97 15
folia 368-10 25 2 24 -- -- -- -- -- -- 95 17
Ulmus 196-5 0 0 -- 1 12 0 3 -- -- 7 0
pumila 196-6 0 0 0 0 0 0 0 0 2 5 0
× 196-8 0 0 0 0 0 0 2 0 -- 0 0
Ulmus
carpini-
folia
Ulmus 228-5 0 0 0 0 0 0 0 -- -- 0 0
(com-
plex.sup.c
hybrid)
`Regal`
______________________________________
.sup.a Each value is a mean of six replications (trees) inoculated in
early June, 1975. Data adapted from Gkinis, 1977.
.sup.b Aggressive isolatetype B from Minnesota
.sup.c Nonaggressive isolatetype A from Maine.
.sup.d Sapporo Autumn Gold elm.
Claims (1)
1. A new and distinct variety of elm tree called Regal as herein described and illustrated primarily characterized by its high resistance to Dutch elm disease and its columnar growth habit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/473,176 USPP5335P (en) | 1983-03-07 | 1983-03-07 | Elm tree called Regal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/473,176 USPP5335P (en) | 1983-03-07 | 1983-03-07 | Elm tree called Regal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| USPP5335P true USPP5335P (en) | 1984-11-13 |
Family
ID=23878501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US06/473,176 Expired - Lifetime USPP5335P (en) | 1983-03-07 | 1983-03-07 | Elm tree called Regal |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | USPP5335P (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USPP6227P (en) | 1985-10-15 | 1988-07-19 | Elm Research Institute | Elm tree named Independence |
| USPP8684P (en) * | 1992-06-18 | 1994-04-12 | Wisconsin Alumni Research Foundation | Elm tree named New Horizon |
| USPP8683P (en) * | 1992-03-26 | 1994-04-12 | Wisconsin Alumni Research Foundation | Elm tree named "Cathedral" |
-
1983
- 1983-03-07 US US06/473,176 patent/USPP5335P/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USPP6227P (en) | 1985-10-15 | 1988-07-19 | Elm Research Institute | Elm tree named Independence |
| USPP8683P (en) * | 1992-03-26 | 1994-04-12 | Wisconsin Alumni Research Foundation | Elm tree named "Cathedral" |
| USPP8684P (en) * | 1992-06-18 | 1994-04-12 | Wisconsin Alumni Research Foundation | Elm tree named New Horizon |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: WISCONSIN ALUMNI RESEARCH FOUNDATION THE, MADISON, Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:SMALLEY, EUGENE B.;LESTER, DONALD T.;REEL/FRAME:004196/0640 Effective date: 19831111 |