نقش کاربرد خارجی IAA و کاینتین بر صفات مورفولوژیک و فیزیولوژیک برنج تحت تنش خشکی

This research was conducted to determine the effects of IAA and Kinetin on the physiological and morphological traits in vegetative and reproductive drought condition in rice (Oryza sativa L.). This experiment as Factorial experiment based on complete design with three replications was carried out in experimental field of faculty of agricultural science, University of Guilan in 2013. This experiment factors were included cultivar with four levels, stress with three levels and hormone with three levels. Results indicated that factors affected significantly all measured traits. In all studied cultivars in vegetative stage drought, reduction of tiller number was caused in reduction of yield amount. The highest amount of SPAD related to upland rice about 45.52. The lower amount of relative water content (27.38) related to Gharib sensitive cultivar in reproductive stage drought. Yield rate in vegetative and reproductive drought with application of both hormones were increased more than 50 percent. The highest amount of STI related to Sepidrood about 1.01. Also, application of both hormones was led to increasing of carbohydrate in paddy. Therefore, this research results indicated that exogenous application of this two hormones in both vegetative and reproductive drought had the effective role in the improvement of morphological and physiological traits.