In order to evaluate and classify morphological and morpho-physiological
traits of durum wheat genotypes in drought and irrigated conditions 200 durum
wheat genotypes were sown in modify augmented design with four replications
during 2013- 2014 farming season. Two replications were considered as drought
condition and two as irrigated. Factor analysis based on principal component
analysis method and varimax rotation indicated that four important factors
accounted for about 87 and 92 percent of the total variation among traits in
drought and irrigated conditions, respectively. In drought stress condition,
the first factor assigned 37 percent of total variation between traits and
was significantly related with spike yield and it?s components. Therefore,
this factor was regarded as spike seed yield factor. Other factors in drought
stress condition accounted for 22, 16 and 12 percent of variation between
traits and were entitled as plant seed yield, spike density and assimilate
transmission factors, respectively. In irrigated condition, the first factor
assigned 36 percent of total variation between traits and was significantly
related with traits plant and spike seed yield, plant and spike harvest
index, No. seed/spike and plant height. This factor was regarded as plant
seed yield factor. Other factors in irrigated condition accounted for 24, 18
and 14 percent of variation between traits and were entitled as production,
assimilate transmission and spike density factors, respectively. Overall,
results revealed effect of different environments on extracted factors,
percent of variation accounted for by factors and traits related with each
factor.
Interactive Effects of Elevated [CO2] and Water Stress on Physiological Traits and Gene Expression during Vegetative Growth in Four Durum Wheat Genotypes