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Agronomy 2018, 8(10), 217;

Growing Degree Days during the Late Reproductive Phase Determine Spike Density and Cognate Yield Traits

Rice Research Institute, Sichuan Agricultural University, 211-huimin Road, Chengdu 611130, Sichuan, China
Department of Plant Breeding and Genetics, University of Agriculture, Faisalabad 38000, Pakistan
Department of Renewable Resources, University of Alberta, Edmonton, AB T6G 2H1, Canada
Sugarcane Research Institute, Ayub Agricultural Research Institute (AARI), Faisalabad 38000, Pakistan
Authors to whom correspondence should be addressed.
Received: 15 August 2018 / Revised: 28 September 2018 / Accepted: 29 September 2018 / Published: 4 October 2018
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Drought has become more frequent in central Asia causing large losses in cereal yield. To surmount the existing problem, it is imperative to emphasize early maturing varietal development. However, the impact of heat units on spike morphology and its relationship with yield potential is still unclear. Thus, the current investigation was carried out to test wheat lines and varieties for variation in total heat unit’s accretion for anthesis and maturity and to understand the manipulating impact of sunlight on spike morphology, grain yield and its cognate traits. Furthermore, the gene action controlling major traits inheritance, combining ability effects, heritability, and association studies were also estimated. Following the Half Sib/Full Sib approach 27 hybrids along with 12 parents were tested. Results depicted broad variation in genetic stock. Correlation study demonstrated that earliness negatively affects the yield, while positively influencing spike density. Genetic variances were greater than variances due to environment, pointing to higher heritability (>50%) for all the characters except for grain’s weight spike−1. The degree of dominance revealed that the partial and over-dominant type of gene action conditioned inheritance of investigated traits. Thus, earliness can be used as an indirect selection criterion for yield advance. View Full-Text
Keywords: line × tester; growing degree days; dominance; association; yield potential line × tester; growing degree days; dominance; association; yield potential

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Farooq, M.U.; Khan, A.S.; Ishaaq, I.; Cheema, A.A.; Afzal, M.S.; Ali, A.; Zhu, J. Growing Degree Days during the Late Reproductive Phase Determine Spike Density and Cognate Yield Traits. Agronomy 2018, 8, 217.

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