title: Comparative proteomic analysis of seed embryo proteins associated with seed storability in rice (Oryza sativa L) during natural aging.
abstract: Seed storability is considered an important trait in rice breeding; however, the underlying regulating mechanisms remain largely unknown. Here, we carried out a physiological and proteomic study to identify proteins possibly related to seed storability under natural conditions. Two hybrid cultivars, IIYou998 (IIY998) and BoYou998 (BY998), were analyzed in parallel because they share the same restorer line but have significant differences in seed storability. After a 2-year storage period, the germination percentage of IIY998 was significantly lower than that of BY998, whereas the level of malondialdehyde was reversed, indicating that IIY998 seeds may suffer from more severe damage than BY998 during storage. However, we did not find correlation between activities of antioxidant enzymes of superoxide dismutase, peroxidase, and catalase and seed storability. We identified 78 embryo proteins in embryo whose abundance varied more than 3-fold different during storage or between IIY998 and BY998. More proteins changed in abundance in IIY998 embryo (67 proteins) during storage than in BY998 (10 proteins). Several redox regulation proteins, mainly glutathione-related proteins, exhibited different degree of change during storage between BY998 and IIY998 and might play an important role protecting embryo proteins from oxidation. In addition, some disease/defense proteins, including DNA-damage-repair/toleration proteins, and a putative late embryogenesis abundant protein were significantly downregulated in IIY998, whereas their levels did not change in BY998, indicating that they might be correlated with seed storability. Further studies on these candidate seed storage proteins might help improve our understanding of seed aging.
authors.affiliation: Agro-biological Gene Research Center, Guangdong Academy of Agricultural Sciences, Guangzhou, 510640, China; Hunan Agricultural University, Changsha, 410128, China.
authors.forename: Jiadong
authors.initials: J
authors.lastname: Gao
authors.affiliation: Rice Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou, 510640, China.
authors.forename: Hua
authors.initials: H
authors.lastname: Fu
authors.affiliation: Rice Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou, 510640, China.
authors.forename: Xinqiao
authors.initials: X
authors.lastname: Zhou
authors.affiliation: Agro-biological Gene Research Center, Guangdong Academy of Agricultural Sciences, Guangzhou, 510640, China.
authors.forename: Zhongjian
authors.initials: Z
authors.lastname: Chen
authors.affiliation: Agro-biological Gene Research Center, Guangdong Academy of Agricultural Sciences, Guangzhou, 510640, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Luo
authors.affiliation: Agro-biological Gene Research Center, Guangdong Academy of Agricultural Sciences, Guangzhou, 510640, China.
authors.forename: Baiyuan
authors.initials: B
authors.lastname: Cui
authors.affiliation: Hunan Agricultural University, Changsha, 410128, China. Electronic address: cgh68@163.com.
authors.forename: Guanghui
authors.initials: G
authors.lastname: Chen
authors.affiliation: Agro-biological Gene Research Center, Guangdong Academy of Agricultural Sciences, Guangzhou, 510640, China. Electronic address: liujun139@139.com.
authors.forename: Jun
authors.initials: J
authors.lastname: Liu
mesh_terms: D000975:Antioxidants / Q000378:metabolism; D001947:Breeding; D002374:Catalase / Q000378:metabolism; D018525:Germination; D005978:Glutathione / Q000378:metabolism; D012275:Oryza / Q000201:enzymology / Q000502:physiology*; D010544:Peroxidases / Q000378:metabolism; D040901:Proteomics; D055314:Seed Storage Proteins / Q000378:metabolism*; D012639:Seeds / Q000201:enzymology / Q000502:physiology*; D013482:Superoxide Dismutase / Q000378:metabolism; D013997:Time Factors
chemical_list: D000975:Antioxidants; D055314:Seed Storage Proteins; D010544:Peroxidases; D002374:Catalase; D013482:Superoxide Dismutase; D005978:Glutathione
keywords: Glutathione-related proteins; Natural aging; Proteomics; Rice (Oryza sativa L); Seed storability; Seed storage proteins