title: Genome-wide identification and characterization of cystatin family genes in rice (Oryza sativa L.).
abstract: 11 Cystatin genes in rice were identified, and their expression patterns were comprehensively analyzed, which reveals multiple roles in both seed development and plant response to environmental variations. Cystatin is a group of small proteins and known to inhibit the activities of cysteine proteases in the papain C1A and legumain C13 peptidase families in plants. Cystatin family genes have only been well characterized recently in a few plant species such as Hordeum vulgare and Nicotiana tabacum, which show their critical roles in programmed cell death and responses to biotic stresses. Up to now, little is known about cystatin family genes and their roles in Oryza sativa, a model plant for cereal biology study. Here, we identified 11 cystatin genes in rice genome. Comprehensive expression profile analysis reveals that cystatin family genes in rice display diverse expression pattern. They are temporally regulated at different developmental stages during the process of seed production and germination. Our experiments also reveal that the majority of cystatin genes are responsive to plant hormones and different environmental cues including cold, drought and other abiotic stresses, while some others are very stable under different stresses, indicating their fundamental roles in normal plant development. In addition, their distribution in rice chromosomes and their evolutionary relation to the members of Cystatin family in A. thaliana and N. tabacum have also been analyzed. These works suggest multiple roles of cystatin family genes in both seed development and plant response to environmental variations.
authors.affiliation: State Key Laboratory of Hybrid Rice, Department of Cell and Developmental Biology, College of Life Sciences, Wuhan University, Wuhan, 430072, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Peng
authors.initials: P
authors.lastname: Zhao
authors.forename: Xue-Mei
authors.initials: XM
authors.lastname: Zhou
authors.forename: Han-Xian
authors.initials: HX
authors.lastname: Xiong
authors.forename: Meng-Xiang
authors.initials: MX
authors.lastname: Sun
mesh_terms: D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D032461:Chromosomes, Plant / Q000235:genetics; D003001:Cloning, Molecular; D017124:Conserved Sequence; D015891:Cystatins / Q000235:genetics*; D020440:Gene Duplication; D020869:Gene Expression Profiling; D018507:Gene Expression Regulation, Developmental / Q000187:drug effects; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D017343:Genes, Plant; D008969:Molecular Sequence Data; D005810:Multigene Family; D012275:Oryza / Q000187:drug effects / Q000235:genetics*; D010802:Phylogeny; D010937:Plant Growth Regulators / Q000494:pharmacology; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics*; D036226:Seedlings / Q000187:drug effects / Q000235:genetics / Q000254:growth & development; D012639:Seeds / Q000187:drug effects / Q000235:genetics / Q000254:growth & development
chemical_list: D015891:Cystatins; D010937:Plant Growth Regulators; D010940:Plant Proteins