ارزیابی و مقایسه همبستگی برخی از صفات با عملکرد دانه گندم دوروم در شرایط تنش شوری و بدون تنش

Since the grain is economically the most important part of the wheat, grain yield improvement
through breeding and yield component improvement are among efficient methods in breeding
programs. Thus, investigating the complex relationships between quantitative trait of yield and its
components is of particular importance. In order to study and determine the correlation of traits, a
research study was conducted in 2007 on 8 lines of durum wheat under salt stress and non-stress
conditions (control) in a factorial experiment based on randomized complete block design with
three replications. The traits which were studied included spike length, root weight, number of
florets per spikelet, spikelets per spike, number of grains per main spike, seed weight, grain yield
and harvest index. The results of correlation coefficients in non-stress condition show a significant
and positive correlation between grain yield and traits including root weight, number of florets in
spikelet, number of grains per main spike and harvest index, while under salt stress condition grain
yield had a significant positive correlation with spikelets per spike trait in addition to the above
traits. Based on stepwise regression analysis, the traits including number of florets per spikelet and
spike length in non-stress condition and the traits including spikelets per spike, number of grains per
main spike and root weight in salt stress condition explained the maximum rate of change of grain
yield and were identified as the most effective traits on grain yield. Therefore, these attributes can
be used as appropriate criteria for selecting lines with high yield.