title: Molecular distinction in genetic regulation of nonphotochemical quenching in rice.
abstract: Nonphotochemical quenching (NPQ) regulates energy conversion in photosystem II and protects plants from photoinhibition. Here we analyze NPQ capacity in a number of rice cultivars. NPQ was strongly induced under medium and high light intensities in rice leaves. Japonica cultivars generally showed higher NPQ capacities than Indica cultivars when we measured a rice core collection. We mapped NPQ regulator and identified a locus (qNPQ1-2) that seems to be responsible for the difference in NPQ capacity between Indica and Japonica. One of the two rice PsbS homologues (OsPsbS1) was found within the qNPQ1-2 region. PsbS protein was not accumulated in the leaf blade of the mutant harboring transferred DNA insertion in OsPsbS1. NPQ capacity increased as OsPsbS1 expression increased in a series of transgenic lines ectopically expressing OsPsbS1 in an Indica cultivar. Indica cultivars lack a 2.7-kb region at the point 0.4 kb upstream of the OsPsbS1 gene, suggesting evolutionary discrimination of this gene.
authors.affiliation: Institute for Environmental Science and Technology, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama City, Saitama 338-8570, Japan.
authors.forename: Ichiro
authors.initials: I
authors.lastname: Kasajima
authors.forename: Kaworu
authors.initials: K
authors.lastname: Ebana
authors.forename: Toshio
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Kentaro
authors.initials: K
authors.lastname: Takahara
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yano
authors.forename: Maki
authors.initials: M
authors.lastname: Kawai-Yamada
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Uchimiya
mesh_terms: D004735:Energy Transfer; D019143:Evolution, Molecular; D018506:Gene Expression Regulation, Plant; D056426:Genetic Loci; D045342:Light-Harvesting Protein Complexes; D012275:Oryza / Q000235:genetics* / Q000378:metabolism; D045332:Photosystem II Protein Complex / Q000235:genetics*; D018515:Plant Leaves; D010940:Plant Proteins / Q000235:genetics; D013045:Species Specificity
chemical_list: D045342:Light-Harvesting Protein Complexes; D045332:Photosystem II Protein Complex; D010940:Plant Proteins