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KMID : 0368420120550030209
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Journal of Plant Biology
2012 Volume.55 No. 3 p.209 ~ p.217
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Multiple impairments in male reproduction 1 (mimr1), a novel male-sterile mutant of Arabidopsis thaliana, shows several defects in male reproductive development
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Chen Hai-Yan
Guan Yue-Feng
Huang Xue-Yong
Wu Yu-Ting
Wang Fen-Fei
Gao Ju-Fang
Zhou Que
Yang Zhong-Nan
Liu Jia-Yao
Zhang Hong-Xia
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Abstract
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We have characterized a new male-sterile mutant in Arabidopsis that exhibits conditional sterility but has restored fertility when drought-stressed. This mutant, multiple impairments in male reproduction 1 (mimr1), shows pleiotropic defects in both vegetative and reproductive development. Examination with dissecting and scanning electron microscopes revealed that its pollen grains are not effectively released from the anther locule after dehiscence, and anther differentiation is defective. Growth of the style and stamen filaments are also abnormal. Histological analysis demonstrated that these phenomena are due not only to a noticeably reduced extension of the stamen but also greater elongation of the pistil. Genetic analysis indicated that mimr1 is a single locus recessive nuclear mutant. The mutation can be mapped to a locus strongly linked to a 1200-kb region on Chromosome 3. Meta-analysis of expression patterning presented several candidate genes in that region. No mutants with similar phenotypes have previously been reported, suggesting that mimr1 is a novel male-sterile locus. Characterization of MIMR1 will provide further insights into the molecular basis for the development of plant reproductive organs.
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KEYWORD
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Arabidopsis thaliana, cell differentiation, drought stress, exine, male sterility, mimr1
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