《Table 2–SNP and SSR markers linked to Els1 locus developed from BSR-Seq and comparative genomics an

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《Mapping a leaf senescence gene els1 by BSR-Seq in common wheat》

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Gene annotation of the corresponding 9.2 Mb genomic region in Chinese Spring revealed two cytochrome P450，one NB-ARC domain protein，one leucine-rich receptor-like protein kinase，one transduction/WD40 repeat-like superfamily protein and one WRKY transcription factor in the mapping interval（Table S1）.Cytochrome P450 monooxygenase CYP89A9 as being responsible for nonfluorescent dioxobilin-type chlorophyll catabolites accumulation is involved in the formation of major chlorophyll catabolites during leaf senescence[41].In Arabidopsis，ORE9，a693 amino acid polypeptide containing 18 leucine-rich repeats functions in limiting leaf longevity by removing，through ubiquitin-dependent proteolysis，target proteins that are required to delay programmed leaf senescence[42].Protein kinases and autophagy-related gene also were reported to play an important role in leaf senescence[43].In Arabidopsis，WD40 protein played important roles in development and also during stress signalling[44].The plant specific WRKY transcription factor family，especially WRKY4，WRKY6，WRKY11，and WRKY53 have been suggested to play an important role in leaf senescence[45].In particular，NB-ARC domain protein usually triggers R-gene mediated pathogen recognition with programing cell death that is a typical feature of necrosis，leaf rust resistance and leaf senescence[46].The coincidence of hybrid necrosis gene Ne2，leaf rust resistance gene Lr13 and early senescence gene Els1 in this genomic region may provide interesting information to understand the relationship between cell death and leaf development in wheat.