Contribution of genes related to grain number (Gn1a and WFP) introgressed into NERICA 1 to grain yield under tropical highland conditions in central Kenya

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dc.creatorKikuta, Mayumi
dc.creatorMenge, Daniel Makori
dc.creatorGichuhi, Emily Waringa
dc.creatorSamejima, Hiroaki
dc.creatorTomita, Rena
dc.creatorKimani, John Munji
dc.creatorMusila, Ruth Nzisa
dc.creatorDoi, Kazuyuki
dc.creatorAshikari, Motoyuki
dc.creatorAngeles-Shim, Rosalyn (TTU)
dc.creatorJena, Kshirod Kumar
dc.creatorMakihara, Daigo
dc.date.accessioned2023-09-11T21:07:25Z
dc.date.available2023-09-11T21:07:25Z
dc.date.issued2023
dc.description© 2023 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. cc-by-nc
dc.description.abstractIn Kenya and many other African countries, improving rice productivity is vital for future food security. To improve rice productivity in Kenya, near-isogenic lines (NIL) were developed by introducing Gn1a and WFP, genes that function to increase grain number per panicle by increasing secondary and primary rachis-branches, into NERICA 1, a registered variety in Kenya. The aim of this study was to determine whether the introduction of these genes has the potential to improve rice productivity under tropical highland conditions in central Kenya. Field experiments were conducted in 2016 and 2017 at a lowland rice field in Mwea, Kenya, under different nitrogen fertilization conditions using three lines of NERICA 1 introgressed with Gn1a and/or WFP (NIL-Gn1a, NIL-WFP, and NIL-Gn1a+WFP) and their recurrent parents, NERICA 1. Two years of field experiments revealed that the introgression lines enhanced grain yield by increasing the number of primary and secondary rachis-branches and the number of grains per panicle. Gn1a and WFP showed additive effects and the introgression of both genes alleviated the negative effects on yield components observed in the introgressed lines, resulting in higher grain yield. Sufficient nitrogen fertilization was required to increase yield in the single-gene introgression lines. However, the line with both Gn1a and WFP achieved reasonable yields even under low fertilizer conditions in Mwea, Kenya. As these introgression lines have similar growing characteristics to their parent variety, they are expected to contribute to increased rice production in Kenya and similar environments in sub-Saharan Africa.
dc.identifier.citationKikuta, M., Menge, D.M., Gichuhi, E.W., Samejima, H., Tomita, R., Kimani, J.M., Musila, R.N., Doi, K., Ashikari, M., Angeles-Shim, R., Jena, K.K., & Makihara, D.. 2023. Contribution of genes related to grain number (Gn1a and WFP) introgressed into NERICA 1 to grain yield under tropical highland conditions in central Kenya. Plant Production Science, 26(3). https://doi.org/10.1080/1343943X.2023.2245127
dc.identifier.urihttps://doi.org/10.1080/1343943X.2023.2245127
dc.identifier.urihttps://hdl.handle.net/2346/96011
dc.language.isoeng
dc.subjectgrain number
dc.subjectgrain yield
dc.subjectnear-isogenic line
dc.subjectNew Rice for Africa (NERICA)
dc.subjectsub-Saharan Africa
dc.subjecttropical highland
dc.titleContribution of genes related to grain number (Gn1a and WFP) introgressed into NERICA 1 to grain yield under tropical highland conditions in central Kenya
dc.typeArticle

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