FR2672465A1 - Sterile male F1 hybrid variety of tobacco of the Burley type "ITB 2001" intended for the industrial production of tobacco leaves - Google Patents

Abstract

New variety of Burley type tobacco. The invention relates to a sterile male F1 hybrid of Burley type tobacco, identified by the varietal name "ITB 2001". It was obtained by crossing between the sterile male tobacco variety "MS200", obtained from the variety "BB16" and maintained by backcrossing with the latter, and the fertile tobacco line "ITB 214", maintained by self-fertilisation, the three abovementioned lines MS 200, BB16 and ITB 214 all being maintained in the reference collection at the Tobacco Institute at Bergerac. It is characterised mainly by the purplish red colour (reference RHS 62B) of its flowers, a developed plant with an average height of 176 cm, of conical to ovoid size carrying 22 to 27 harvestable leaves and differs from the reference variety BB16 by a more developed plant, a higher number of leaves and therefore a greater yield. It is of great interest in the tobacco industry because of its high resistance to black root rot (Chalara elegans).

Description

The present invention consists of a hybrid male-sterile F1 variety of Tobacco of type "Burley", identified by the name "ITB 2001", intended for the tobacco industry and which differs from known varieties of its species by the unique combination of the following features:
- purplish red flower (RHS 62-B) and 50 mm in length;
- very developed plant with rather erect habit of conical to ovoid shape and whose leaves have a more open angle of insertion than that of BB16, Burley tobacco variety known from the trade and taken as reference variety;
- yield, quality index and properties of resistance to black rot of the roots much superior to those of the aforementioned reference variety;
The present variety responds positively to the objective set by the inventor, namely obtaining tobacco
Burley allowing to advantageously replace the reference variety BB16 thanks to a greater resistance to black root rot (Cha; lara e7egans) and to a better quality raw material.

 The present invention results from the crossing between, on the one hand, the variety MS 200, male-sterile tobacco chosen as female parent, itself resulting from the variety BB16 and, on the other hand, a stabilized fertile line, identified by the name ITB 214, used as a male parent.

 The male-sterile variety MS 200, which contains the cytoplasm of Nicotiana Suaveoiens, is maintained by backcrossing with the variety BB16.

 The fertile variety ITB 214 used as a male parent is maintained by self-fertilization.

 The three aforementioned lines MS 200, BB16, and ITB 214 above are maintained by the applicant in a reference collection at the Institut du Tabac in Bergerac.

 The invention constituted by the hybrid F1 resulting from the crossing between the two aforementioned parents was carried out for the first time in 1986 and was cultivated on an experimental basis in 1988 and 1989 in order to study its behavior and to compare it with the variety BB16 chosen as reference variety as well as various other hybrids.

 During these tests, the F1 hybrid constituting the present invention proved to be superior to the other varieties in terms of research objectives and in particular in terms of resistance to black root rot (Cha7ara e7egans).

It also made it possible to obtain a better yield by weight.

Anyone skilled in the art can reproduce the hybrid male-sterile F1 variety "ITB 2001" which is the subject of the present invention by crossing between, on the one hand, the male-sterile variety "MS 200" itself maintained by backcrossing with the variety of trade "BB16" and, on the other hand, the fertile variety "ITB 214" whose properties are maintained by self-fertilization. Samples of the three lines "" MS 200 "," BB16 "and" ITB 214 "are kept in the reference collection at the Institut du Tabac,
Domaine de la Tour in Bergerac.

DESCRIPTION
The description below is based on observations of tobacco plants in cultivation in Bergerac, France. The color connotations used below are those used in the
Color map of the RIlS (Royal Horticultural Society) itself used by the experts of the International Convention for the Protection of New Varieties of Plants known as the UPOV Convention.

This description is made according to the criteria defined by
ANITIA and ION in "The fundamental morphological characteristics for the botanical description of tobacco", 1960,
Bull. Inf. CORESTA, 4, 17-32.

1 - Conical to ovoid template
2 - Height of the plant 176 cm (+ or - 7) greater than BB16
3 - Cylindrical stem, highly albinic
4 - Upright growth habit (less upright than ITB 2201) 5 - Leaves (sessile)
. Number of sheets 22 to 27 (greater than BB16, less than
usable (> 15cm) ITB 2201)
Leaf blade smooth slightly pleated in position
wavy edge basset hound
. Light green color with lighter veins
turning green yellow when ripe
. Elliptical shape (see Figures 3,4 and 5)
. Diameter ratio (from 2.07
the largest sheet)
. Leaf tip slightly tapered to tapered
. Base of sessile leaf, decurrent auricle
Insertion on the rod at a very open angle for
lowest leaves and vertical to
vertical oblique for leaves
middle and high
6 - Flowers
. Inflorescence round, fairly compact
. Male sterile with stigmastoid anthers
. Stigma does not emerge from the chalice
. Length 45.9 (+ or - 2t2) mm
. Color purplish red RHS 62 B
Plants of the hybrid male-sterile variety F1 "ITB 2001" were observed and described during the months of August and
September 1988 and 1989. The descriptive characters listed below result from an average carried out during the aforementioned period on twenty (20) plants taken themselves at random from a plot of two hundred (200) feet. During the said tests, the variety which is the subject of the present invention has proved to be homogeneous and stable. Minimal differences, if any, which may arise depending on the conditions of the ambient climate and the terrain, are not liable to modify the combination of the essential characteristics of the present invention.

 The male-sterile F1 hybrid "ITB 2001" object of the present invention is a developed tobacco whose length of the internodes is medium. It is light in color and has a whitish stem and veins characteristic of Burley type tobacco.

 Figures 1 to 5 illustrate the following features of the present invention.

 Figure 1 shows the external morphology and section of an unfertilized flower and a cross section of the corolla.

 Figure 2 shows the general habit of the plant.

 Figures 3 to 5 show the upper, middle and lower leaves, respectively.

 Compared with the reference variety BB16, the variety "ITB 2001", whose morphology is quite close to BB16, is distinguished from this by a development, a size and a number of higher leaves as well as by a better resistance to black root rot (C. elegans).

 The results of the field trials carried out in 1988 and 1989 are shown in the table below.

Experimentation 1988:
Variety Yield by weight Quality index Total alkaloids
Crude (kg / ha) (50 to 122) (% of dry matter)
BB16 2486 82.5 2.97
ITB 2001 2654 83.4 3.07
1989 experiment:
Variety Yield by weight Quality Index Total alkaloids
Gross (kg / ha) (50 to 122) (% of ms)
BB16 3400 75.5 4.19
ITB 2001 3739 80.6 4.36 I1 results from these results that, compared to the reference variety BB16, the variety object of the present invention has a higher yield and a better quality index (expert rating taking into account the physical quality of the fabrics and their color after drying).

Claims (2)

Claims 1) distinct hybrid F1 male-sterile tobacco variety "ITB 2001", burley type, identified by the characters described above and by the samples deposited and maintained in the reference collection of the Tobacco Institute in Bergerac, characterized by the following new and unique combination of morphological and physiological characters: plant of 176 cm in average height, carrying from 22 to 27 harvestable leaves, the largest of them having a diametral ratio (length / width) of 2.07; plant with medium-erect habit and conical to ovoid shape, characterized by strong resistance to black root rot (Cha7ara e7egans); leaves elliptical in shape and light green in color with lighter veins turning greenish yellow at maturity, with smooth or slightly pleated blade with wavy edge; flowers round, of an average length of 45.9 mm and of a purplish red color (RHS 62 B). 2) tobacco plants of the variety according to claim 1 as well as the leaves, fresh or dry, from said plants.