LRG1 maintains sterile lemma identity by regulating OsMADS6 expression in rice
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G1 maintains sterile lemma identity by regulating OsMADS6 expression in rice †
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Qiankun Xu , Xiaoqi Yu , Yuanjiang Cui, Saisai Xia, Dali Zeng, Qian Qian & Deyong Ren
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State Key Lab of Rice Biology, China National Rice Research Institute, Hangzhou 310006, China Received June 9, 2020; accepted September 8, 2020; published online October 30, 2020
Citation:
Xu, Q., Yu, X., Cui, Y., Xia, S., Zeng, D., Qian, Q., and Ren, D. (2020). LRG1 maintains sterile lemma identity by regulating OsMADS6 expression in rice. Sci China Life Sci 63, https://doi.org/10.1007/s11427-020-1816-x
Dear Editor, Spikelet is the unique structural unit of grass panicles with florets and diverse glume-like organs. In rice, a normal spikelet usually has two pairs of glume-like organs, including a pair of sterile lemmas and a pair of rudimentary glumes. Generally, the sterile lemma is considered to be the severely degenerated bract, but its origin is still controversial. G1/ ELE, EG1, ASP1, OsMADS34, FON4, and LRG1/NSG1 are expressed strongly in the sterile lemma, and are important regulators to determine the sterile lemma identity. In the g1/ ele, eg1, asp1, osmads34, fon4, and lrg1/nsg1 mutants, the sterile lemmas of most spekelets are elongated and homeotically transformed into the lemma-like organs (Ren et al., 2020; Xu et al., 2020; Zhuang et al., 2020). MFS1, SNB, OsIDS1, and FZP belong to the AP2/ERF families, and have the function of determining the identity of sterile lemma. In the mfs1, snb, osids, and fzp mutants, normal sterile lemma is not observed, but an organ similar to the rudimentary glume is present at the corresponding position (Ren et al., 2018). The above genes play very key roles in the regulation of the sterile lemma fate, and these findings reveal that the lemma, sterile lemma, and rudimentary glume are homologous organs. However, the origin and evolution of the sterile lemma are not completely clear in grass. Further research is still necessary to understand the evolutionary and original relationship in rice spikelet. †Contributed equally to this work *Corresponding authors (Qian Qian, email: [email protected]; Deyong Ren, email: [email protected])
In previous studies, we described a spikelet mutant lrg1 (lacking rudimentary glume 1) (Xu et al., 2020). About 43% spikelets of lrg1 mutant produced the elongated sterile lemmas with the lemma identity. Interestingly, in this study we found that the elongated sterile lemmas of some lrg1 spikelets contained two parts: one rough body with protrusions and trichomes on its epidermis and two smooth marginal tissues (Figure 1A1–A4, B1–B4). Further observation showed that the body of the elongated sterile lemmas (besl) of the lrg1 mutant, the body of the palea (bop) and lemma of the wild type or lrg1 mutant had similar cellular structures, and the two marginal regions of the elongated sterile lemmas (mresl) of the lrg1 mutant had similar cellular structures with the marginal regions of palea (mrp) in the wild type or lrg1 mutant (Figure 1A5 and A6, B5 and B6, C1–C4, D
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