ВЛИЯНИЕ ОБРАБОТКИ СЕМЯН РАЗНЫМИ ДОЗАМИ ГЕТЕРОАУКСИНА НА РОСТОВЫЕ ПАРАМЕТРЫ ДВУХ СОРТОВ ФАСОЛИ

Abstract

Priming of seeds in auxin solution is a model of the action of auxin-producing bacteria on plant growth. The aim of the study was to identify auxin concentrations that stimulate and inhibit the growth of seedlings of two varieties of beans. Seeds were soaked for 3 hours in tenfold dilutions of heteroauxin 0,00001–100 mg/l, germinated on wet filters in the dark, growth parameters (germination energy, germination, length of axial organs of the seedling, number and length of lateral and accessory roots, root and shoot weight) were measured on the 7th day. For the Ufa variety, an increase in all growth indicators by 25-36% relative to the control occurred only at a dose of 0,001 mg/l, while the shoot/root ratio of 1.8 was as in the control. Changing this dose by an order of magnitude led to a neutral or negative effect on all growth indicators. For the Elsa variety, the growth of the length of the main root on the gradient of hormone concentrations was characterized by a two-vertex graph with a maximum value of an increase in root length by 23% to the control at a dose of 0,1 mg/l hormone. At the same time, the shoot/root ratio is 1,0. According to other indicators, no stimulating effect was found. The presence of one or more pessimums of the values of the growth indicators of seedlings on the concentration curve indicates that in both varieties the range of stimulating concentration of exogenous auxin is very narrow. Therefore, to stimulate growth, it is necessary to use precision and individual concentrations of exogenous hormone for each variety.