Generation Mean Analysis Reveals the Predominant Gene Effects for Grain Iron and Zinc Contents in Pearl Millet.

Autor: Pujar M; International Crops Research Institute for the Semi-Arid Tropics, Patancheru, India.; Department of Genetics and Plant Breeding, University of Agricultural and Horticultural Sciences, Shimoga, Shivamogga, India., Govindaraj M; International Crops Research Institute for the Semi-Arid Tropics, Patancheru, India.; Alliance of Bioversity International, International Center for Tropical Agriculture (CIAT), Cali, Colombia., Gangaprasad S; Department of Genetics and Plant Breeding, University of Agricultural and Horticultural Sciences, Shimoga, Shivamogga, India., Kanatti A; International Crops Research Institute for the Semi-Arid Tropics, Patancheru, India., Gowda TH; Department of Genetics and Plant Breeding, University of Agricultural and Horticultural Sciences, Shimoga, Shivamogga, India., Dushyantha Kumar BM; Department of Genetics and Plant Breeding, University of Agricultural and Horticultural Sciences, Shimoga, Shivamogga, India., Satish KM; Department of Biotechnology, University of Agricultural and Horticulatural Sciences, Shimoga, Shivamogga, India.
Jazyk: angličtina
Zdroj: Frontiers in plant science [Front Plant Sci] 2022 Jan 28; Vol. 12, pp. 693680. Date of Electronic Publication: 2022 Jan 28 (Print Publication: 2021).
DOI: 10.3389/fpls.2021.693680
Abstrakt: Pearl millet [ Pennisetum glaucum (L.) R. Br.] is a climate-resilient dryland cereal that has been identified as a potential staple food crop that can contribute to alleviating micronutrient malnutrition, particularly with respect to grain iron (Fe) and zinc (Zn) contents, in Sub-Saharan Africa and India. In this regard, an understanding of the inheritance pattern of genes involved in Fe and Zn contents is vital for devising appropriate breeding methods to genetically enhance their levels in grains. In this study, we aimed to determine the genetic effects underlying such inheritance and their interactions based on the generation mean analyses. Four experimental crosses and their six generations (P 1 , P 2 , F 1 , BCP 1 , BCP 2 , and F 2 ) were independently evaluated in a compact family block design in 2017 rainy and 2018 summer seasons. ANOVA revealed highly significant mean squares ( p < 0.01) among different generations for grain Fe and Zn contents. Six-parameter generation mean analyses revealed a predominance of additive genetic effect and a significant ( p < 0.05) additive × dominant interaction for the grain Fe content. The additive genetic effect for the grain Zn content was also highly significant ( p < 0.01). However, interaction effects contributed minimally with respect to most of the crosses for the grain Zn content and hence we assume that a simple digenic inheritance pattern holds true for it. Furthermore, we established that narrow-sense heritability was high for the grain Fe content (>61.78%), whereas it was low to moderate for the grain Zn content (30.60-59.04%). The lack of superior parent heterosis coupled with non-significant inbreeding depression for Fe and Zn contents in grains further confirmed the predominance of an additive genetic effect. These findings will contribute to strategizing a comprehensive breeding method to exploit the available variability of grain Fe and Zn contents for the development of biofortified hybrids of pearl millet.
Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
(Copyright © 2022 Pujar, Govindaraj, Gangaprasad, Kanatti, Gowda, Dushyantha Kumar and Satish.)
Databáze: MEDLINE
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