CsSh5.1, which controls hypocotyl elongation under high temperature conditions in cucumber, was mapped to a 57.1 kb region on chromosome 5 containing a candidate gene encoding a xyloglucan galactosyltransferase.
Hypocotyl growth is a vital process in seedling establishment. Hypocotyl elongation after germination relies more on longitudinal cell elongation than cell division. Cell elongation is largely determined by the extensibility of the cell wall. Here, we identified a spontaneous mutant in cucumber (Cucumis sativus L.), sh5.1, which exhibits a temperature-insensitive short hypocotyl phenotype. Genetic analysis showed that the phenotype of sh5.1 was controlled by a recessive nuclear gene. CsSh5.1 was mapped to a 57.1 kb interval on chromosome 5, containing eight predicted genes. Sequencing analysis revealed that the Csa5G171710 is the candidate gene of CsSh5.1, which was further confirmed via co-segregation analysis and genomic DNA sequencing in natural cucumber variations. The result indicated that hypocotyl elongation might be controlled by this gene. CsSh5.1 encodes a xyloglucan galactosyltransferase that specifically adds galactose to xyloglucan and forms galactosylated xyloglucans, which determine the strength and extensibility of the cell walls. CsSh5.1 expression in wild-type (WT) hypocotyl was significantly higher than that in sh5.1 hypocotyl under high temperature, suggesting its important role in hypocotyl cell elongation under high temperature. The identification of CsSh5.1 is helpful for elucidating the function of xyloglucan galactosyltransferase in cell wall expansion and understanding the mechanism of hypocotyl elongation in cucumber.
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We thank Lihuang Zhu (Institute of Genetics and Developmental Biology, Chinese Academy of Sciences) for affording technical support for the experiment. This study was supported by the Project of Science and Technology Commission of Shanghai Municipality (18391900300), the National Natural Science Foundation of China (no. 31672173), the National Natural Science Foundation of China (31972425), and. the Agri-X Interdisciplinary Fund of Shanghai Jiao Tong Univerity (Agri-X2017011).
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Communicated by Sanwen Huang.
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Zhang, K., Pan, J., Chen, Y. et al. Mapping and identification of CsSh5.1, a gene encoding a xyloglucan galactosyltransferase required for hypocotyl elongation in cucumber (Cucumis sativus L.). Theor Appl Genet (2021). https://doi.org/10.1007/s00122-020-03754-2