DWARF10, an RMS1/MAX4/DAD1 ortholog, controls lateral bud outgrowth in rice

被引:490
作者
Arite, Tomotsugu
Iwata, Hirotaka
Ohshima, Kenji
Maekawa, Masahiko
Nakajima, Masatoshi
Kojima, Mikiko
Sakakibara, Hitoshi
Kyozuka, Junko [1 ]
机构
[1] Univ Tokyo, Grad Sch Agr & Life Sci, Tokyo 1130032, Japan
[2] Okayama Univ, Bioresources Res Inst, Kurashiki, Okayama 7100046, Japan
[3] RIKEN, Plant Sci Ctr, Yokohama, Kanagawa 2300045, Japan
关键词
rice; shoot branching; D10; auxin; feedback control;
D O I
10.1111/j.1365-313X.2007.03210.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Plant architecture is mostly determined by shoot branching patterns. Apical dominance is a well-known control mechanism in the development of branching patterns, but little is known regarding its role in monocots such as rice. Here, we show that the concept of apical dominance can be applied to tiller bud outgrowth of rice. In dwarf10 (d10), an enhanced branching mutant of rice, apical dominance can be observed, but the inhibitory effects of the apical meristem was reduced. D10 is a rice ortholog of MAX4/RMS1/DAD1 that encodes a carotenoid cleavage dioxygenase 8 and is supposed to be involved in the synthesis of an unidentified inhibitor of shoot branching. D10 expression predominantly occurs in vascular cells in most organs. Real-time polymerase chain reaction analysis revealed that accumulation of D10 mRNA is induced by exogenous auxin. Moreover, D10 expression is upregulated in six branching mutants, d3, d10, d14, d17, d27 and high tillering dwarf (htd1). No such effects were found for D3 or HTD1, the MAX2 and MAX3 orthologs, respectively, of rice. These findings imply that D10 transcription might be a critical step in the regulation of the branching inhibitor pathway. In addition, we present observations that suggest that FINE CULM1 (FC1), a rice ortholog of teosinte branched 1 (tb1), possibly works independently of the branching inhibitor pathway.
引用
收藏
页码:1019 / 1029
页数:11
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