Os03g0203200
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Contents
Annotated Information
Function
The function of Dwarf 88 was confirmed by complementation test and antisense analysis. D88, thus, represents a new category of genes that regulates cell growth and organ development and consequently plant architecture. The potential relationship between the tiller formation associated genes and D88 is discussed and future identification of the substrate for D88 may lead to the characterization of new pathways regulating plant development [1].
We propose that D14 functions downstream of strigolactone synthesis, as a component of hormone signaling or as an enzyme that participates in the conversion of strigolactones to the bioactive form [2]. The d14 mutant exhibits increased shoot branching with reduced plant height like the previously characterized strigolactone-defi cient and -insensitive mutants d10 and d3 , respectively [2].
The results suggest that the HTD2 gene could negatively regulate tiller bud outgrowth by the strigolactone pathway [3]. which is characterized by a high tillering and dwarf phenotype. Phenotypic analysis of the mutant showed that the mutation did not aVect formation of tiller bud, but promoted the subsequent outgrowth of tiller bud [3].
Expression
The gene Dwarf 88 was expressed in most rice organs, with especially high levels in the vascular tissues [1]. The mutant had excessive shorter tillers and smaller panicles and seeds compared to the wild-type. A reduction in number and size of parenchyma cells around stem marrow cavity as well as a delay in the elongation of parenchyma cells caused slender tillers and dwarfism in the d88 mutant [1].
The d14 branching phenotype could not be rescued by exogenous strigolactones. In addition, the d14 mutant contained a higher level of 2 ′ - epi -5-deoxystrigol than the wild type. Positional cloning revealed that D14 encodes a protein of the α / β -fold hydrolase superfamily, some members of which play a role in metabolism or signaling of plant hormones [2].
HTD2 transcripts were expressed mainly in leaf. Loss of function of HTD2 resulted in a signiWcantly increased expression of HTD1, D10 and D3, which were involved in the strigolactone biosynthetic pathway [3].
Evolution
we identiWed a rice mutant htd2 from one of the 15,000 transgenic rice lines [3].
Labs working on this gene
- National Center for Gene Research/Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 500 Caobao Road, 200233 Shanghai, China
- State Key Laboratory of Rice Biology, China National Rice Research Institute, Chinese Academy of Agricultural Sciences, 310006 Hangzhou, China
- Ishikawa Prefectural University, Nonoichi, Ishikawa, 921-8836 Japan
- RIKEN Plant Science Center, Tsurumi, Yokohama, 230-0045 Japan
- Graduate School of Agriculture and Life Sciences, University of Tokyo, Yayoi, Bunkyo, Tokyo, 113-8657 Japan
- Research Institute for Bioresources, Okayama University, Kurashiki, Okayama, 710-0046 Japan
- State Key Laboratory of Rice Biology, China National Rice Research Institute, 359 Tiyuchang Road, 310006 Hangzhou, Zhejiang, China
- Biotechnology Research Center, China Three Gorges University, 443002 Yichang, Hubei, China
References
1.Gao Z, Qian Q, Liu X, et al. Dwarf 88, a novel putative esterase gene affecting architecture of rice plant[J]. Plant molecular biology, 2009, 71(3): 265-276. 2.Arite T, Umehara M, Ishikawa S, et al. d14, a strigolactone-insensitive mutant of rice, shows an accelerated outgrowth of tillers[J]. Plant and cell physiology, 2009, 50(8): 1416-1424.
3.Liu W, Wu C, Fu Y, et al. Identification and characterization of HTD2: a novel gene negatively regulating tiller bud outgrowth in rice[J]. Planta, 2009, 230(4): 649-658.
