Assessment of protein yield criteria through correlation, regression and path analysis in bread wheat (Triticum aestivum L.) cultivars
Journal Title: International Journal of Farming and Allied Sciences - Year 2013, Vol 2, Issue 1
Abstract
Study on relationship among some morphological and agronomic attributes with protein yield of bread wheat cultivars was done in randomized complete block design. Relationship among measured traits were assessed by phenotypic correlation coefficient, step-wise regression and path analysis. Correlation analysis showed the significant reltaion of seed and protein yield with all the traits except correlation of grain filling duration and peduncle length with seed yield as well as spike yield and peduncle length with protein yield. Regression analysis by using step-wise method revealed that 83.8 percent of total variation exist in protein yield accounted for by traits entered to regression model namely; grain filling rate, grain filling duration, peduncle length and spike harvest index. Grain filling rate accounted for the highest amount of variation about 46.5%. Other traits accounted for 20, 11.3 and 6 percent of variation of protein yield, respectively. Because of that, these traits are recommended as the main componenets of protein yield in bread wheat cultivars. Path analysis showed the traits grain filling rate and grain filling duration had the highest and positive direct effects on protein yield. On the other hand, peduncle length and spike harvest index showed low positive and negative direct effect on protein yield. Overall, grain filling rate and grain filling duration were recognized as the best indirect selection criteria to improve protein yield in bread wheat cultivars via seletion especially from preliminary generations of breeding programs.
Authors and Affiliations
Saied Salehi, Ghorban Noormohammadi, Sayyed Mohammadjavad Mirhadi, Akbar Ghandi
Keywords
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