Abstract
Relationships between the traits associated with lodging resistance in wheat were studied within the period of 1999-2002 at Wheat Research Center, Dinajpur in both F1 and F2 generations of a 9 × 9 diallel cross without reciprocal. The genotypic and phenotypic correlation coefficients studied in F1 and F2 generations were similar with some exceptions. In both F1 and F2 generation, the second internode breaking strength was positively correlated with diameter, wall thickness and unit-stem weight of second internode, and main shoot weight but negatively with plant height and second internode length at both genotypic and phenotypic levels. It was observed from path coefficient analysis in both F1 and F2 generations that the second internode unit-stem weight had high positive direct effect on its breaking strength. Main shoot weight, second internode diameter and wall thickness positively influenced breaking strength through its unit-stem weight. Simultaneous selection for the traits contributing to lodging resistant in semi-dwarf wheat might be effective in the improvement of lodging resistance in bread wheat.DOI: http://dx.doi.org/10.3329/bjpbg.v20i2.17036
Highlights
Relationships between the traits associated with lodging resistance in wheat were studied within the period of 1999-2002 at Wheat Research Center, Dinajpur in both F1 and F2 generations of a 9 × 9 diallel cross without reciprocal
Genotypic and phenotypic correlations The genotypic and phenotypic correlation coefficients studied in F1 and F2 generations were similar in most of the cases with few exceptions (Table 1 and 2)
In both F1 and F2 generations, the second internode breaking strength was positively correlated with main shoot weight, second internode diameter, second internode wall thickness and second internode unit-stem weight, but negatively correlated with second internode length at both genotypic and phenotypic levels
Summary
Nine spring wheat genotypes were crossed in a diallel mating system excluding the reciprocals in rabi 1999-2000. In the wheat-growing season, 2001-02, the nine parents and their 36 F2s were grown in plots of 3.0m x 1.50m having 6 rows (single row for each parent and 4 rows for each F2s) placing seed 10cm apart and row-to-row 25cm at WRC farm, Dinajpur. Genotype and phenotypic correlation coefficients between characters contributing to lodging resistance as well as yield were estimated following the formula suggested by Miller et al (1958). Path coefficient of the traits related to lodging resistance were analyzed from the phenotypic and genotypic correlations assuming the second internode breaking strength (as the substitute of lodging resistance) as the dependent variable following method of Singh and Chaudhary (1985) and Dabholkar (1992) which was originally developed by Wright (1921). Path coefficient of the traits related to lodging resistance were analyzed from the phenotypic and genotypic correlations assuming the second internode breaking strength (as the substitute of lodging resistance) as the dependent variable following method of Singh and Chaudhary (1985) and Dabholkar (1992) which was originally developed by Wright (1921). Dewey and Lu (1959) employed this method for the first time in plants to disentangle the direct and indirect influences of component characters
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