- MajidVakil Asadolaei1, BahramMajd Nassiri2, Maryam Yousefifard3*
- Faculty of Agriculture, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
- Isfahan Agricultural and Natural Resource Research Center. Isfahan, Iran
- Department of Environment and Natural Resources, Payame Noor University, PO BOX 19395-3697, Tehran, Iran
Randomized complete block design with four replications in two drought
and non-drought environments was used for this study. Drought resistance
indices were calculated based on seed yield in stress and non-stress
conditions. The results showed that GMP and STI were the best drought
resistance indices so had the positive and significant correlation with
Yp and Ys. Three dimensional graph showed that RFG5*AF80, G-543 and
Farokh were the drought resistant hybrids. These hybrids had the highest
amount of Yp, Ys, GMP and STI that revealed the highest yield potential
as well as drought tolerance in these genotypes. Because of that these
hybrids have promised potential to cultivate in drought prone environments.
Regression analysis revealed that the traits grain filling
rate, grain filling duration and water use efficiency accounted for
97.0% of total variation exist in seed yield.Path coefficient analysis demonstrated the highest and positive direct effect of grain filling
rate and grain filling duration on seed yield in sunflower hybrids.
Water use efficiency had low direct effect while high indirect effects
via grain filling duration on seed yield.Therefore, the study revealed
the importance of total grain filling rate and grain filling duration as
indirect selection criteria for genetic improvement of seed yield in
sunflower breeding programs especially in early generations. On the
other hand, indirect effects of water use efficiency through grain
filling duration on seed yield have promising result in selection
programs. Get the full articles at: http://www.innspub.net/volume-6-number-5-may-2015-jbes/
0 comments:
Post a Comment