Effects of drought on grain yield and some physiological characteristics of red bean genotypes

Subject Areas : Journal of Plant Ecophysiology

M. Zadeh Bagheri ¹ (استادیار دانشگاه آزاد اسلامی واحد شیراز)
Sh. Javanmardi ² (حقق دانشگاه آزاد اسلامی واحد شیراز)
O. Alozadeh ³ (دانشیار دانشگاه آزاد اسلامی واحد شیراز)
M.M. Kamelmanesh ⁴ (استادیار دانشگاه آزاد اسلامی واحد شیراز)

Received: 2014-11-03 Accepted : 2014-11-03 Published : 2014-11-01

Keywords: Soluble sugars, Proline, Chlorophyll index, potassium ion,

Abstract :

In order to study the effect of drought stress on seed yield and some physiological characteristics of different genotypes of red bean, an experiment was performed in split plot based on randomized complete block design in three replications at the research field of Islamic Azad University of Shiraz. The main plot factor was irrigation surfaces (normal and stress) and the sub plot factor was red bean genotypes including KS31169, D81083 and Goli. Samples were taken after drought stress in the 50% flowering stage, and the amounts of soluble sugars, proline content, sodium and potassium, relative water content and leaf chlorophyll index were measured. Grain yield and 100 grain weight traits were also estimated after harvesting. The results of the experiment showed that the concentration of soluble sugars, proline content, leaf chlorophyll index and K+ increased and relative water content decreased under drought stress. Sodium ions revealed no significance different among genotypes under normal and stress conditions. KS31169 genotype had the highest rain yield, 100 grain weight, leaf chlorophyll index and proline content. D81083 genotype had the highest 100 seed weight, relative water content and soluble sugar content. Amount of potassium ions, relative water content and chlorophyll index increased in Goli genotype. The results indicated that the accumulation of excess sugars, chlorophyll, potassium and proline content in beans can make the plant resistant to drought stress.