Evaluation of Seed Resistance of Winter Durum Wheat Varieties to Lack of Moisture and Overheating

Abstract

AbstractThe article presents studies on the assessment of the relative drought resistance and heat resistance of winter durum wheat varieties. The study was conducted in 2016–2018. The object of the research was winter durum wheat varieties bred by ARC “Donskoy”. The purpose of the research is to study the resistance of seeds of three varieties of winter durum wheat to lack of moisture and overheating during germination in laboratory conditions. It was shown that high resistance to water deficiency and heat stress in the studied varieties of winter durum wheat manifest themselves in different ways. So the Onyx variety, with a moisture deficit (definition of drought resistance), did not have the highest values. But at the same time, it has the highest heat resistance values. The studied varieties of winter durum wheat Lazurit and Onyx were higher in germination than the standard variety Donchanka in all concentrations of the solution. Using an osmotic solution with a concentration of 12 and 14 atm. All varieties had high germination and belonged to the first resistance group. At a critical concentration of osmotic pressure (16 atm), the number of germinated seeds varies from 69.4% (Lazurit) to 63% (Donchanka). It was found that the seeds of the studied varieties of winter durum wheat were characterized by lower germination under conditions of increasing water stress, while the seeds of different years of reproduction had different reactions to water stress. It was revealed that the seeds of the studied varieties differed significantly in germination after heating.KeywordsVarietyWinter durum wheat (Lat. Trīticum dūrum)Drought resistanceHeat resistanceResistanceThermal testing