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Novel role of photoinsensitive alleles in adaptation of soybean [Glycine max (L.) Merr.] to rainfed short growing seasons of lower latitudes

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Abstract

Soybean is a temperate photosensitive crop but has adapted to sub-tropical and tropical countries of lower latitudes also. Photoperiodic and maturity genes confer latitudinal adaptation in this crop. Genotyping of accessions of higher latitudes have shown the role of photoinsensitivity, conferred by recessive photoperiodic alleles (e1/e2/e3/e4), in adaptation of the crop to high latitudes but information is not available for lower latitudinal countries like India. We genotyped and calculated the photosensitivity of 101 cultivated Indian soybean varieties and found that majority of the varieties (86) were photosensitive and had the dominant alleles at these loci. Four genotypic classes (e1-as/E2/E3/E4, E1/e2/e3/E4, E1/e2/E3/E4 and E1/E2/e3/E4) were observed for varieties with recessive alleles. Photoinsensitive alleles at E1 and E2 loci significantly reduced the days to flower, maturity and photosensitivity percentage. Adaptive role of photoperiodic alleles was inferred from breeder seed requirement of these varieties for 35 years. Although the photosensitive class contributed 81% to the total seed requirement the weighted mean contribution of this class (380 Q/year) was far less than that of photoinsensitive class (648 Q/year). Photoinsensitivity is essential for perpetuation of crop in higher latitudes. Present report highlights the novel role of photoinsensitive alleles in adaptation of soybean to rainfed, short growing and sub-tropical conditions of lower latitudes by conferring earliness.

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Acknowledgements

Authors are thankful to Director, ICAR-IISR, Indore for providing all the required facilities for the experiments. Authors are thankful to Department of Biotechnology, Ministry of science and technology for providing research grant.

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SG and GK planned all experiments and coordinated the work; RT performed phenotyping and genotyping for photosensitivity calculation; VSB conceptualized the idea; VN, GKS, SM and MR analyzed data; MK, PK and NA conducted large field trials and compiled seed data, RV, SC recorded data and SC helped in writing of manuscript.

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Correspondence to Sanjay Gupta.

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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.

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Tripathi, R., Agrawal, N., Kumawat, G. et al. Novel role of photoinsensitive alleles in adaptation of soybean [Glycine max (L.) Merr.] to rainfed short growing seasons of lower latitudes. Genet Resour Crop Evol 68, 2455–2467 (2021). https://doi.org/10.1007/s10722-021-01142-3

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  • DOI: https://doi.org/10.1007/s10722-021-01142-3

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