PJB-2018-482
EVALUATION OF PHYSIOLOGICAL AND MORPHOLOGICAL RESPONSE IN SYNTHETIC WHEAT GENOTYPES TO RAINFED CONDITIONS
WAQAS AHMAD
Abstract
Twelve morphological and physiological traits were used to evaluate 64 wheat genotypes developed by crossing SH-257 (synthetic) with Opata (bread wheat) in order to investigate the physio-morphic responses of varying wheat genotypes and to estimate the mutual correlation among various physio-morphic and yield contributing traits under rainfed conditions. All traits revealed significant differences among genotypes which elucidates the presence of substantial amount of genetic variation present among the genotypes for each trait. Correlation studies unveiled the positive and significant association of number of tillers plant-1 and flag leaf area with grain yield. Based on path coefficient analysis, fertile tiller plant-1 inflicted maximum direct effect on grain yield plant-1(0.30). This elucidates that more emphasis should be given to this trait regarding wheat breeding under drought stress as one positive selection of a character would result in the improvement of other correlated ones. Moderate residual effects were revealed which point out towards the possibility of additional components contributing to seed yield. Although, several lines were better responsive only in few characters, the lines DR132MP3, DR128MP3, DR110MP3, DR98MP3, DR122MP3, DR83MP3, DR122MP3, DR97MP3, DR85MP3 and DR98MP3 were identified as drought tolerant based on tiller plant-1, spike length, number of grains spike-1, 1000-grain weight, grain yield plant-1, ELWR, CMS, chlorophyll content, canopy temperature and flag leaf area. These genotypes may perhaps be used in the future wheat breeding programs.
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