Plant Growth Hormones Increase the Stimulation Efficiency of Seedlings Development for Spring Wheat Seeds upon Pre-sowin
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RAL BIOLOGY
Plant Growth Hormones Increase the Stimulation Efficiency of Seedlings Development for Spring Wheat Seeds upon Pre-sowing Treatment Corresponding Member of the RAS S. A. Shobaa, I. V. Gorepekina, G. N. Fedotova, and T. A. Grachevaa,* Received December 20, 2019; revised December 26, 2019; accepted January 20, 2020
Abstract—The influence of pre-sowing treatment of spring wheat seeds with combined use of plant growth hormones and sorption preparations based on bentonite–humate mixtures on seeds germination and their development in soils was studied. In some cases, the combined use of plant growth hormones and the sorption preparation (CB-H-BYA) that can decrease the intake of allelotoxins from soil to seeds allows noticeably increasing the efficiency of plant growth hormones used for pre-sowing treatment. The inclusion of cytokinins (6-benzylaminopurine, kinetin, and forchlorophenuron) into the sorption preparation (CB-H-BYA) had markedly different effects on seeds germination. The addition of Polysorbate 20 to the sorption preparation (CB-H-BYA) leads to an increase in the effectiveness of its action on seed germination.
Keywords: allelotoxicity, stimulation of seeds, pre-sowing seeds treatment, humates, bentonites, gibberellins DOI: 10.1134/S0012496620040080
Stimulating pre-sowing treatment of seeds has been known for a long time [1, 2]. In this case, there are effects that are not always reproduced. The instability of stimulating effects was explained by weather conditions, seed quality, etc. However, the general reasons for this instability have not been understood. It can be assumed that the small magnitude of the effects of stimulating seed treatment and their irreproducibility are explained by the action of stimulating substances against the background of the inhibitory effect of allelotoxins coming to seeds from the soil [3, 4]. As a result, the stimulating effect is manifested to varying degrees, depending on the magnitude of the inhibitory effect of allelotoxins. It was earlier shown that the protection of seeds from the inhibitory effect of allelotoxins by sorption drugs itself stimulated their development and also provided a significant increase in the efficiency of some preparations containing stimulating substances [5, 6]. It has been shown that not only allelotoxins, but also biologically active substances (BASs), which are necessary for their development, enter the germinating seeds from the soil. Fixing these BASs on sorbents slows the development of seeds [6]. Therefore, a Faculty
of Soil Science, Moscow State University, Moscow, Russia *e-mail: [email protected]
brewer’s yeast autolysate (BYA), containing a large set of various biologically active substances (vitamins, enzymes, amino acids, etc.) that were supposed to block the sorption centers of the sorbent that could fix biologically active substances entering the seeds from the soil was introduced into the sorption preparation. Thus, the negative effect of sorption preparations on seed germination was removed. The aim of the
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