اثر تنش خشکی بر محتوای کلروفیل و فلورسانس کلروفیل و عملکرد دانه‌ ژنوتیپ‌های لوبیا چیتی

In order to estimate effects of drought stress on chlorophyll and chlorophyll fluorescence and grain yield of pinto bean (Phaseolus vulgaris L.), an experiment was carried out as split plot based on complete randomized block design with four replications at Zanjan university research farm. In this experiment, two irrigation levels (optimum irrigation during growth season and post flowering drought stress) were set at main plots and six pinto bean cultivars (Khomein, COS16, sadri, KS21193, KS21191, KS21189) were set at sub plots. Results showed that drought stress decreased significantly chlorophyll b and total chlorophyll (a+b) and maximum fluorescence and Maximal PS II photochemical. But it had not significant effects on chlorophyll a and increased initial fluorescence. Also, KS21191 genotype had the highest grain yield under drought stress because of the highest chlorophyll b and the highest total chlorophyll and it had highest increasing initial fluorescence under drought stress too.