Positional cloning identified HvTUBULIN8 as the candidate gene for round lateral spikelet (RLS) in barley (Hordeum vulgare L.)
文献类型: 外文期刊
第一作者: Qin, Dandan
作者: Qin, Dandan;Liu, Gang;Xu, Fuchao;Xu, Qing;Peng, Yanchun;Ge, Shuangtao;Dong, Jing;Qin, Dandan;Liu, Gang;Xu, Fuchao;Xu, Qing;Peng, Yanchun;Ge, Shuangtao;Dong, Jing;Liu, Rui;Dong, Guoqing;Wang, Chunchao;Guo, Ganggang;Ling, Yu;Li, Chengdao
作者机构:
期刊名称:THEORETICAL AND APPLIED GENETICS ( 影响因子:5.4; 五年影响因子:5.7 )
ISSN: 0040-5752
年卷期: 2023 年 136 卷 1 期
页码:
收录情况: SCI
摘要: Key messageMap-based cloning, subcellular localization, virus-induced-gene-silencing and transcriptomic analysis reveal HvTUB8 as a candidate gene with pleiotropic effects on barley spike and leaf development via ethylene and chlorophyll metabolism.Barley lateral spikelet morphology and grain shape play key roles in grain physical quality and yield. Several genes and QTLs for these traits have been cloned or fine mapped previously. Here, we report the phenotypic and genotypic analysis of a barley mutant with round lateral spikelet (rls) from cv. Edamai 934. rls had round lateral spikelet, short but round grain, shortened awn, thick glume and dark green leaves. Histocytologic and ultrastructural analysis revealed that the difference of grain shape of rls was caused by change of cell arrangement in glume, and the dark leaf color resulted from enlarged chloroplast. HvTUBULIN8 (HvTUB8) was identified as the candidate gene for rls by combination of RNA-Seq, map-based-cloning, virus-induced-gene-silencing (VIGS) and protein subcellular location. A single G-A substitution at the third exon of HvTUB8 resulted in change of Cysteine 354 to tyrosine. Furthermore, the mutant isoform Hvtub8 could be detected in both nucleus and cytoplasm, whereas the wild-type protein was only in cytoplasm and granular organelles of wheat protoplasts. Being consistent with the rare phenotype, the "A" allele of HvTUB8 was only detected in rls, but not in a worldwide barley germplasm panel with 400 accessions. VIGS confirmed that HvTUB8 was essential to maintain spike integrity. RNA-Seq results suggested that HvTUB8 may control spike morphogenesis via ethylene homeostasis and signaling, and control leaf color through chlorophyll metabolism. Collectively, our results support HvTUB8 as a candidate gene for barley spike and leaf morphology and provide insight of a novel mechanism of it in barley development.
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