tailieunhanh - Combining ability studies for morpho-physiological, yield, yield attributes nitrogen use efficiency and its related traits in bread wheat (Triticum aestivum L.)

In India, wheat is the most important cereal crop and plays a major role in food and nutritional safety. Worldwide, there is a growing interest in the development of wheat cultivars that are more effective in utilizing nitrogen (N) and better suited to N constraints. he objective of this research was to investigate the comparative significance of general (GCA) and specific (SCA) combining ability in a set of wheat genotypes with promising lines and their corresponding half-diallel crosses. Combining yield ability for yield attributes, nitrogen use efficiency (NUE) and its associated characters were studied in twelve bread wheat genotypes and their sixty six F1s derived from halfdiallel crosses and assessed under 50 per cent of recommended dose of nitrogen condition using three replicated alpha lattice design. Variance due to GCA has been found to be important for all traits. This indicates the significance of additive genetic variance in regulating the expression of these characters. Significance of variance due to SCA was noted for all traits except for grain protein content and nitrogen harvest index, showing the significance of non-additive genetic variance in regulating the expression of these characters. In most of the traits, the variance ratios were less than unity except for the grain protein content and nitrogen harvest index, thus representing the preponderance of non-additive gene action for most characteristics. Parents namely, 3 SATYN 9402, K9107, HD 2967 and 46 IBWSN 1005 were the best general combiners and crosses namely, 3 SATYN 9402 x K9107, 3 SATYN 9402x HD 2967, 3 SATYN 9402x 46 IBWSN 1005, 3 SATYN 9402 x DBW 14, HD 2967x 46 IBWSN 1005 and WH 1022x K9107 found to be the best specific combiners for yield and NUE associated traits. | Combining ability studies for morpho-physiological, yield, yield attributes nitrogen use efficiency and its related traits in bread wheat (Triticum aestivum L.)