Assessment the relationship between grain yield and agronomic traits of spring wheat genotypes in dry land condition

Subject Areas : Journal of Plant Ecophysiology

ali ahmadi ¹ (مرکز تحقیقات کشاورزی و منابع طبیعی استان لرستان، خرم اباد، ایران)
R. Porghasemi ² (گروه زراعت و اصلاح نباتات، دانشگاه زابل، زابل، ایران)
T. Hosseinpor ³ (مرکز تحقیقات کشاورزی لرستان، خرم آباد، ایران)
S. Sohrabi ⁴ (گروه زراعت و اصلاح نباتات، دانشگاه زابل، زابل، ایران)

Received: 2015-01-16 Accepted : 2015-04-30 Published : 2016-06-01

Keywords: Factor analysis, Correlation, Stepwise regression, path analysis,

Abstract :

To investigate the relationship between agronomic characteristics with 18 spring wheat genotypes, an experiment was carried out in a randomized complete block design indry land condition of Agriculture and Natural Resources Research Station in Khorramabad during 2011-2012. Fourteen traits including seed yield and their components and morphological characteristics were evaluated. Correlation analysis showed that biomass has the highest positive and significant correlation coefficient (r= 0.79**) with yield. And then straw yield, harvest index and spike r = 0.56*, r = 0.50* and r = 0.49* respectively. Based on stepwise regression spike, harvest index, weight and height of the main spike yield components and grain yield were greater share of justification. Path analysis showed that the number of spike per square meter, harvest index, spike weight and height were important factors in increasing yield. The highest positive direct effects on grain yield were also related to the number of spikes and spike weight. Factor analysis showed that four factors (yield, biological yield, straw yield and seed weight) and independent of the total 72% of total variance explained data. The first factor is the factor with the greatest variance function against three traits of effective biological yield, straw yield and grain weight on grain yield confirmed.