Abstract
Jasmonate ZIM-domain (JAZ) proteins and DELLA proteins are key negative regulators of jasmonates (JAs) and gibberellin (GA) signaling, respectively. In this study, we found JA and GA synergistically promote fiber cell initiation. We characterized the cellular function of a JAZ protein (GhJAZ3), and a DELLA protein (GhSLR1) of cotton (Gossypium hirsutum). GhJAZ3 is specifically expressed in elongating fibers, while GhSLR1 is expressed in different tissues and at a relatively higher level in 3 DPA ovules. GhSLR1 and GhJAZ3 proteins are localized in the cell nucleus. Yeast two-hybrid analysis indicated that GhSLR1, GhJAZ3 and GhDEL65 could interact with each other, and GhSLR1 could also interact with GhBZR1. Overexpression of GhJAZ3 in Arabidopsis increased hypocotyl and root length, leaf trichome length, and plant height, but decreased the number of leaf trichome, while overexpression of GhSLR1 in Arabidopsis decreased hypocotyl length, leaf trichome length and density. Expression of several leaf trichome initiation determinators (GL3, GL2, TTG2 and MYB23) was down-regulated in GhJAZ3 or GhSLR1 transgenic Arabidopsis, while expression of the cell elongation related genes (EXP1, EXP8, EXPL2 and XTH4) was altered in the GhJAZ3 and GhSLR1 transgenic Arabidopsis. Taken together, these results demonstrate that GhJAZ3 and GhSLR1 function in jasmonate and gibberellin mediated epidermal cell differentiation and elongation.
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This work was supported by National Natural Sciences Foundation of China (Grant No. 31271317).
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GQH, XBL, and XCX designed the experiment, analyzed the data and wrote the manuscript. XCX, and QQH performed most of the experiments. YC, WL, LHH, WYW, and MT performed some of the experiments and assisted in data analysis. All authors have read and approved the final manuscript.
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Communicated by Nobuhiro Kotoda.
Xiao-Cong Xia and Qian-Qian Hu have contributed equally to this manuscript.
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Xia, XC., Hu, QQ., Li, W. et al. Cotton (Gossypium hirsutum) JAZ3 and SLR1 function in jasmonate and gibberellin mediated epidermal cell differentiation and elongation. Plant Cell Tiss Organ Cult 133, 249–262 (2018). https://doi.org/10.1007/s11240-018-1378-9
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DOI: https://doi.org/10.1007/s11240-018-1378-9