3 research outputs found
Genetic and multivariate phenotypic analyses of some selection indices in pistachio (Pistacia vera L.) cultivars under drought stress conditions
Genetic and multivariate phenotypic analyses of some selection indices in pistachio (Pistacia vera L.) cultivars under drought stress conditions
Heritability and Genetic Gain are commonly used by plant breeders to estimate
the accuracy of a selection index and used for measuring the response to
selection. The aim of the present study was the genetic and phenotypic
analyses of some physiological traits to identify the most reliable of them
for selective breeding of pistachio cultivars under drought stress
condition. Nineteen Pistachio (Pistacia vera L.) cultivars with wide range
of tolerance to drought stress were collected from across the orchards of
Rafsanjan (Iran’s center of pistachio cultivation) and were used in
randomized complete block design with three replications under two
environmental conditions (normal and water stress) in 2011-2012. The results
of genetic analysis showed that high magnitude of phenotypic and genotypic
coefficient of variation along with broad sense heritability and genetic
gain were estimated in relative water protection (RWP), excised leaf water
loss (ELWL), relative water content (RWC) and relative water loss (RWL)
under drought stress condition, indicating that the inheritance of these
traits can be mainly controlled by additive gene effects followed by
reflecting the possibility of effective selection for genetic improvement of
these traits. Path analysis revealed that RWP had the highest direct and RWL
and WRC indirect effects on YSI. Principal component analysis indicated that
selected indices were reliable for classification and identification of
drought-tolerant pistachio cultivars and identified RWP, RWC and WRC as the
best indicators for screening drought tolerant genotypes