اثر تنش كمبود آب بر عملكرد و اجزاي عملكرد ژنوتيپ هاي لوبيا چيتي

Effect of water deficit stress on yield and yield components of pinto bean (Phaseolus vulgaris L.) genotypes

Bayat.A. A., A. Sepehri, G. Ahmadvand and H. R. Dorri. 2010. Effect of water deficit stress on yield and yield components of pinto bean {Phaseolus vulgaris L.) genotypes. Iranian Journal of Crop Sciences. 12 (1):42- 54 (in Persian). To study the effect of water deficit stress on yield and yield components of pinto bean {Phseolus vulgaris L.) genotypes, a split plot experiment in a complete randomized block design with three replications was conducted at the National Khomein Bean Research Field Station in 2007 cropping season. Irrigation regimes including irrigation after 60 (II), 80 (12) and 100 (13) mm evaporation from class A pan asigned to main plots and pinto bean genotypes (Khomein, Talash, Tylor, Cosl6, KS21193, KS21191, KS21189, G01437 and G14088) were randomized in subplots. Results showed that water deficit stress reduced biological yield, grain yield, number, of pods plant"1, 100 grain weight and harvest index (HI). However, the number of grains.pod"1 was not significantly affected by water deficit stress. Irrigation after 60 mm evaporation with 5427.8 kg ha"1 of biological yield, 2526.4 kg ha"1 of grain yield, 38.3 g of 100 grain weight and 46.4% of harvest index, was the best irrigation regime for pinto bean genotypes. Number of pods.plant"1,was relatively influenced by water deficit stress. Response of pinto bean genotypes to water deficit stress was significantly different. Cos 16 and Tylor had the best response to the water stress in 13 treatment and were identified as water deficit stress tolerant genotypes. On the other hand, KS21193 with 33.8% and 69.9% yield reduction in 12 and 13 water deficit treatments when compared with 13 treatment was the most sensitive genotype to water deficit stress.