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How diverse a farmer-managed wheat landrace can be?‎

Phenotypic variation in phenological, quantitative and qualitative traits was assessed in geographically-isolated, farmer-managed wheat landrace populations grown under subsistence farming conditions.‎ Several multivariate, genetic diversity and structural equation modeling procedures were used to build a comprehensive structure of the landrace and to (1)‎ identify and construct multivariate distances between components of the landrace, (2)‎ identify plant- and seed-related traits contributing to its composition, (3)‎ build principal components that can account for maximum variation, (4)‎ quantify variance components accounted for by major seed qualitative traits, (5)‎ partition total diversity and estimate levels of population differentiation, (6)‎ build and validate a predictive model of landrace population-trait association, (7)‎ identify traits affecting spikelet fertility as a critical component of grain yield under the prevailing hot conditions in Oman, and (8)‎ construct and interpret structural equation models to estimate the direct and indirect effects of quantitative and qualitative traits on grain yield per plant for each landrace population.‎ The results will be discussed within the context of on-farm conservation and sustainable utilization of endangered wheat landrace populations under subsistence farming and to illustrate the use of advanced multivariate statistical methods in assessing phenotypic variation in sub- divided landrace populations.‎

Authors: 
Jaradat, A.‎ A.‎, Shahid, M
Year: 
۲۰۱٤
Publication type: 
Scientific Paper
Publication Source: 
Emirates Journal of Food and Agriculture
Volume/Chapter/Issue: 
۲٦
Page Number: 
pp.‎ 93-118