اثر تنش خشکی بر هدایت روزنه‌ای، محتوای نسبی آب، عملکرد دانه و‌ بیولوژیک و شاخص برداشت ژنوتیپ‌های لوبیا چیتی

In order to estimate effects of drought stress on stomatal conductance and relative water content and grain yield and biomass and harvest index 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 biomass, grain yield, relative water content and stomatal conductance. KS21191 genotype had the highest grain yield under drought stress. It had highest relative water content and biomass and high stomatal conductance under drought stress too. Harvest index reducted in total genotypes except KS21193 genotyp.