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

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Relation http://oar.icrisat.org/11959/
https://doi.org/10.3389/fpls.2021.693680
doi:10.3389/fpls.2021.693680
 
Title Generation Mean Analysis Reveals the Predominant Gene Effects for Grain Iron and Zinc Contents in Pearl Millet
 
Creator Pujar, M
Govindaraj, M
Gangaprasad, S
Kanatti, A
Gowda, T H
Dushyantha Kumar, B M
Satish, K M
 
Subject Pearl Millet
Plant Nutrition
Biofortification
Food and Nutrition
 
Description 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 (P1, P2, F1, BCP1, BCP2, and F2) 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 x 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.
 
Publisher Frontiers Media
 
Date 2022-01
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://oar.icrisat.org/11959/1/fpls-12-693680.pdf
Pujar, M and Govindaraj, M and Gangaprasad, S and Kanatti, A and Gowda, T H and Dushyantha Kumar, B M and Satish, K M (2022) Generation Mean Analysis Reveals the Predominant Gene Effects for Grain Iron and Zinc Contents in Pearl Millet. Frontiers in Plant Science (TSI), 12 (693680). pp. 1-13. ISSN 1664-462X