DD217409A1 - Means to influence plant growth and plant development - Google Patents

Abstract

The invention relates to means for controlling plant growth and development processes, in particular for influencing the fruit set and for increasing the salt tolerance. As active ingredients, they contain mixtures of gibberellins, substances of the general formula I and substances of the general formulas II or III in addition to customary auxiliaries and tracer substances.

Description

Agent for influencing plant growth and development

Field of application of the invention

The invention relates to novel combinations for regulating plant growth and development, in particular increasing tolerance to stress conditions.

Characteristic of the known technical solutions

It is known that phytohormones and artificial regulators of plant metabolism and growth at the various receptors can attack and trigger different reactions depending on the level of development of the plant, the concentration and the preparation of the active ingredient. This results in very diverse applications. In this way, one can promote or inhibit germination processes. In addition, the vegetative and generative bud formation, the flowering process and the sexual determination are influenced and parthenocarp fruit formation to achieve. -

It is known that combinations of gibberellins, diphenylurea and β-naphthoxyacetic acid promote the fruiting of fruit (WILLIAMS et al., 1978). Similarly, benzyladenine and subsequent gibberellic acid application to tomato intolerance promote their development by altering the assimilate distribution in the shoot (KINET et al., 1978).

r * rx in the α η rs η

It is further known that various synthetic agents having a growth-influencing action are used to regulate plant growth, in particular to increase the salt tolerance of the plants (US-PS 3357130, US-PS 3357132).

However, these agents have certain disadvantages, such as often poor reproducibility, phytotoxic and toxic side effects, too great an economic burden on the production process u. a. more.

Object of the invention

The use of new means and procedures aims to favorably influence the growth and / or development of agricultural, horticultural and forestry crops. In particular, the aim is to provide simpler and more economically favorable compounds to be prepared in comparison with the hitherto known substances for increasing the salt tolerance and the fruit set.

Explanation of the essence of the invention

The invention relates to the reasons mentioned for the application of new suitable combinations of active ingredients of gibberellins with cytokinin- and auxinanalog acting agents as effectors of plant growth and plant development. '

It has been found that gibberellins in combination with substances of the general formula I

in the R is a lower alkyl or optionally substituted, aralkyl or furfuryl group, X is hydrogen, halogen, alkyl or nitro, where η = 1 or 2, and Y is oxygen or sulfur, and substances of the general formula II

o c H, coo CH

1 2 in which X and X independently of one another represent hydrogen,

C is - alkyl or halogen, R ^{1 is} hydrogen or alkyl, R is hydrogen or hydroxyl and η is 0 to 6

    2

with the proviso that in the case of R = hydroxyl η = 1

2 and in the case of R = H η = 1 to 6, or substances of general formula III

O-CH ₂ -COR

12

in which X and X, independently of one another, denote hydrogen, halogen or C.sub.-alkyl and R denotes C.sub.1-4-alkyl groups which are optionally substituted by halogen and / or hydroxyl, have growth-inhibiting properties with further advantages in terms of their application and action.

Depending on the dose, the time of application and the place of application, various processes are meaningfully influenced in practice, such as. B. changes in growth habit, regulation of flower formation, the fruit set and the fruit drop, the tolerance to stress conditions. In particular, in the salt tolerance better effects than in the known solutions can be achieved. The use of the active compound combinations is advantageously carried out in the usual means for biological process control preparations or application forms, such as solutions, emulsions, suspensions, concentrates, which prepares with the addition of liquid and / or solid carriers or diluents usually with the addition of surfactants and other formulating agents and can be diluted with water for use. The application forms depend on the intended use. You have to ensure in any case a fine distribution of the active substances. The preparation is carried out in a conventional manner by mixing or Mahlver'fahren.

embodiments

The following examples are intended to illustrate the invention without limiting it

 In the tables mean:

GS = gibberellic acid

A = N- [i-ethyl-pyrazolyl- (5)] - N'-phenylurea B = bis [2-methyl-4-chlorophenoxyacetic acid] -ethylene glycol ester. ,

Statistical security: +++ = 99.9%) '

++ = 99.0% ν significantly higher + = 95 0 y Y as control

«= 99.9 h λ significantly lower

- = 99.0 % yer than control - = 95.0%)

- 5 - '. :.

Example 1: Increase of salt tolerance in cereals

To test the increased tolerance of the plants to salinated ground wheat seeds (Triticum aestivum) was variety Hatri treated with the inventive compositions and cultured in sand with 0.2% addition of NaCl in climate room at 2O ⁰ C. * The evaluation was performed after 9 days. The criterion of the evaluation were mean baking ^time: medium shoot length, shoot and root dry weight.

Table 1: Average runtime, shoot length, shoot and root dry matter (control = 100 %)

+ A + B: 3: 2) Effort amount ppm Casserole d Sprout length mm Dry matter sprout root g g 100 100 100 100 120 Control (HgO) 250 96 157 ⁺ 117 88 82 "" GS 62.5 125 96 94 130 141 ⁺ 92 86 " 94 GS (1 250 9O ⁺ ++ 164 ^ ⁺ 106 106 5Ö0 9Q-HH 20I ⁺ ++ 122 ⁴ " ¹ " .103 1000 9I ⁺ ^ 212 ⁴ " ¹ " * " 12O ⁴⁺

Claims (2)

invention claim 1. A composition for controlling plant growth and development processes, characterized in that, in addition to customary excipients and carriers, combinations of Gibbellellins, substances of the general formula I, in the R is a lower alkyl or optionally substituted aralkyl or furfuryl group, X is hydrogen, halogen, alkyl or nitro, where η = 1 or 2, and Y is oxygen or sulfur, and substances of general formula II OCH ₂ COOCH - ß ⁴ [CH- ^) _n . II I OCH ₂ COOCH ₂ 12
in which X and X independently of one another represent hydrogen, CV - alkyl or halogen, R ^{1 is} hydrogen or alkyl, K is hydrogen or hydroxyl and η is 0 to 6 2 with the proviso that in the case of R = hydroxyl η = 1 2 ·
and in the case of R = H η can be 1 to 6, or substances of the general formula III III 1 2 in which X and X, independently of one another, denote hydrogen, halogen or C 1 -5-alkyl and R optionally denote C, C 1 -alkyl groups substituted by halogen and / or hydroxyl. 2. means for controlling plant growth and development processes according to item 1, characterized in that they can be used in combination with other pesticides and / or agrochemicals.