Variety changing of winter soft wheat as a method to improve productivity and resistance to abiotic environmental factors

Abstract

The article deals with the use of variety changing to increase productivity and resistance of winter wheat varieties to abiotic environmental factors. As a result of the variety changing and sequence of varieties successively replacing each other, the productivity increased from 3.3 t/ha (stage I) to 6.2 t/ha (stage VII). It has been established that the varieties belonging to the steppe ecotype possess a higher level of drought resistance in comparison with the varieties of the forest-steppe ecotype. According to the stages of variety changing drought tolerance ranged from 69–70% (stage I) to 95–99% (stage VII). The level of heat resistance from I to V stage of the variety changing was low (48–70%), excluding the variety “Rostovskaya” (III stage of variety changing) with its heat resistance of 81%. The varieties of the sixth and seventh stage of the variety changing possess high heat resistance (90–99%). The replacement of the cultivated varieties with new, more adaptive and highly productive ones will allow stabilizing grain production and rising its quantity.

Keywords

• winter wheat
• variety changing
• productivity
• drought resistance
• heat resistance
• protein
• water and temperature stresses