مرکز منطقه ای اطلاع رساني علوم و فناوري - Enzyme, Chlorophyll and Ion Changes in Some Common Bean Genotypes by High Temperature Stress

Abstract :

High temperature in bean growing is one of the stress factors that negatively affects the unit area yield and crop quality. In this study, it is important to determine the enzyme, chlorophyll and ion contents of tolerant and susceptible bean genotypes in order to reduce the yield and quality reductions due to the high temperature during production period. Changes in high-temperature stress in five different periods in high temperature stress tolerant (Yakutiye and V-a1) and susceptible (Zulbiye and T7) bean genotypes were investigated in the study. Bean seeds were planted in a 2 liter pot containing peat: perlite mixture in a 2:1 ratio as each pot contains three plants. When the plants reached 3 true leaf stages, they were transferred to the high tunnel in the greenhouse to expose them to high temperature stress. The day the plants were transferred to the tunnel was taken to be the zeroth (0.) day. The changes in the level of catalase (CAT), superoxide dismutase (SOD), ascorbate peroxidase (APX), malondialdehyde (MDA), chlorophyll-a, chlorophyll-b, the total chlorophyll, K, Ca and Na of the mentioned bean genotypes were examined on the 0^th, 2^nd, 4^th, 6^th and 8^th days of the high temperature stress. High temperature stress caused significant decrease in the chlorophyll a, chlorophyll b, and total chlorophyll amount of susceptible genotypes. In addition, the susceptible bean genotypes were found to have a higher MDA ratio than the tolerant genotypes. The amounts of CAT, SOD and APX in tolerant genotypes were increased with respect to susceptible genotypes.