Abstract
Premature senescence can limit crop productivity by limiting the growth phase. In the present study, a spontaneous premature senescence mutant was identified in rice (Oryza sativa L.). Genetic analysis revealed that the premature senescence phenotype was controlled by a recessive mutation, which we named Oryza sativa premature senescence1 (ospse1). The ospse1 mutants showed premature leaf senescence from the booting stage and exhibited more severe symptoms during reproductive and ripening stages. Key yield-related agronomic traits such as 1,000-grain weight and seed-setting rate, but not panicle grain number, were significantly reduced in ospse1 plants. Chlorophyll content, net photosynthetic rate, and transpiration rate of ospse1 flag leaves were similar to the wild-type plants in vegetative stages, but these parameters decreased steeply in the mutant after the heading stage. Consistent with this, the senescence-associated genes OsNYC1 and OsSgr were up-regulated in ospse1 mutant during premature leaf senescence. The ospse1 locus was mapped to a 38-kb region on chromosome 1 and sequence analysis of this region identified a single-nucleotide deletion in the 3′ region of an open reading frame (ORF) encoding a putative pectate lyase, leading to a frame shift and a longer ORF. Our results suggested that the premature senescence of the ospse1 may be regulated by a novel mechanism mediated by pectate lyase.
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Abbreviations
- ABA:
-
Abscisic acid
- CC:
-
Chlorophyll content
- MeJA:
-
Methyl jasmonate acid
- NPR:
-
Net photosynthetic rate
- ORF:
-
Open reading frame
- SAG:
-
Senescence-associated gene
- SPAD:
-
Soil plant analysis development
- TR:
-
Transpiration rate
- qRT-PCR:
-
Quantitative reverse transcription polymerase chain reaction
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Acknowledgments
This work was supported by a grant from the National High Technology Research and Development Program of China (2012AA10A303); and a grant from the Talent Introduction Projects of Guangdong Provincial Colleges and Universities (2011) to L. Chen.
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The authors declare that they have no conflicts of interests.
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Communicated by T. Sasaki.
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Wu, HB., Wang, B., Chen, Y. et al. Characterization and fine mapping of the rice premature senescence mutant ospse1 . Theor Appl Genet 126, 1897–1907 (2013). https://doi.org/10.1007/s00122-013-2104-y
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DOI: https://doi.org/10.1007/s00122-013-2104-y