Abstract
Key message
A stable QTL qSalt-A04-1 for salt tolerance in the cotton seed germination stage, and two candidate genes, GhGASA1 and GhADC2, that play negative roles by modulating the GA and PA signalling pathways, respectively, were identified.
Abstract
The successful transition of a seed into a seedling is a prerequisite for plant propagation and crop yield. Germination is a vulnerable stage in a plant’s life cycle that is strongly affected by environmental conditions, such as salinity. In this study, we identified a novel quantitative trait locus (QTL) qRGR-A04-1 associated with the relative germination rate (RGR) after salt stress treatment based on a high-density genetic map under phytotron and field conditions, with LOD values that ranged from 6.65 to 16.83 and 6.11–12.63% phenotypic variations in all five environmental tests. Two candidate genes with significantly differential expression between the two parents were finally identified through RNA-seq and qRT-PCR analyses. Further functional analyses showed that GhGASA1- and GhADC2-overexpression lines were more sensitive to salt stress than wild-type Arabidopsis based on the regulation of the transcript levels of gibberellic acid (GA)- and polyamine (PA)- related genes in GA and PA biosynthesis and the reduction in the accumulation of GA and PA, respectively, under salt stress. Virus-induced gene silencing analysis showed that TRV:GASA1 and TRV:ADC2 were more tolerant to salt stress than TRV:00 based on the increased expression of GA synthesis genes and decreased H2O2 content, respectively. Taken together, our results suggested that QTL qRGR-A04-1 and its two harboured genes, GhGASA1 and GhADC2, are promising candidates for salt tolerance improvement in cotton.
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Acknowledgments
We thank Professor Tianzhen Zhang of Zhejiang University for releasing RNA-seq data.
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This work was supported by the Fund of the Science and Technology Support Programme of Hebei Province (16226307D) and the Top Talent Fund of Hebei Province.
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ZM designed the research; QG, HK, CL, XL, ZS, ZL, WR, JY, YZ, LW, GZ, XW performed experiments; QG, XW analyzed data; QG wrote the manuscript; ZM, XW revised the manuscript. All authors read and approved the manuscript.
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Gu, Q., Ke, H., Liu, C. et al. A stable QTL qSalt-A04-1 contributes to salt tolerance in the cotton seed germination stage. Theor Appl Genet 134, 2399–2410 (2021). https://doi.org/10.1007/s00122-021-03831-0
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DOI: https://doi.org/10.1007/s00122-021-03831-0