Response of wheat cultivars to salt stress by leaf chlorophyll fluorescence method

Siberian Federal Scientific Center of Agro-Bio Technologies of the Russian Academy of Sciences, 630501 Krasnoobsk, Russia

Abstract

In laboratory experiments, the varietal specificity of the formation of adaptive reactions of 10-16 day-old seedlings of three varieties of spring wheat under chloride salinization (1.3%) according to the daily dynamics of chlorophyll fluorescence parameters (ChF) was established. The informative value of the ChF parameters Y(II), ETR, qP, Fv/Fm, Fv/Fo, Y(NPQ), qN and Y(NQ) as reliable biomarkers for early assessment of the resistance of varieties to chloride salinization at the level of photosynthetic apparatus has been confirmed. The reaction to chloride salinization of the more stable Sibirskaya 21 variety was less pronounced compared to the less stable varieties Novosibirskaya 29 and Novosibirskaya 41. The more stable variety has the smallest changes in the parameters of the ChF relative to the control. The greatest intervarietal differences in chloride salinization were manifested in 16-day-old seedlings. The level of photosynthetic activity in the formation of adaptive reactions during chloride salinization can serve as a criterion of stress resistance, which will speed up the selection of breeding material and increase its efficiency due to early rejection of unpromising samples.