Effects of Potassium Applications on Changes of Chlorophyl, Ion and Enzyme Activity in Heat Sensitive Bean Genotypes

Abstract

One of the most important problems in greenhouse production is the negative effect of high temperature. High temperature that is one of the stress factors negatively affects quality and yield in the cultivation of greenhouse bean. This study aimed to reduce yield and quality losses due to high temperature during production period. In this study, which investigated the effectiveness of potassium applications, Zulbiye bean variety were used that it is sensitive to high temperature stress and the V71 genotype investigated in our previous studies were used that it is sensitive to high temperature stress. Bean seeds were planted in 2-liter pot containing a 2: 1 mixture of peat and perlite. Doses of potassium (K) were in the form of 0 (control) ppm, 500 ppm, 1000 ppm and 2000 ppm, and the study was performed in the four repetitions and four pots in each repetition, and two plants in each pot, according to the factorial experimental design. Plants were irrigated with the Hoagland nutrient solution from bean seeds were planted to the end of the study. When it reaches 24 days from planting, the temperature of the control plants varies between 20-25 0 C in the greenhouse, whereas plants applied high temperature were taken an additional tunnel in the green house. In order to be able to see the effect of stress on the bean plants, in the bean genotypes, CAT, SOD, APX, MDA, chlorophyll a, chlorophyll b, total chlorophyll, K, Ca and Mg contents changes were examined. In conclusion, in the study investigating the effect of different doses K applications on tolerance to high temperature in beans, especially 1000 ppm K dose might be used to reduce adverse effects of high temperature. © 2018, Centenary University. All rights reserved.