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中国农科院水稻所曾大力和钱前研究团队发表叶片早衰机制研究进展
2015年12月25日,著名植物学期刊《Journal of Experimental Botany》在线发表中国农业科学院水稻研究所曾大力、钱前研究员带领的水稻功能基因组学创新团队的一篇研究论文,研究人员在叶片早衰机制研究上取得新进展。杨窑龙博士和徐杰博士为共同第一作者,曾大力研究员与钱前研究员为论文共同通讯作者。
 
研究人员借助图位克隆手段分离了水稻淡绿叶控制基因PGL,该基因编码水稻叶绿素a加氧酶,是叶绿素b形成过程中的关键基因,该基因的功能缺失会导致水稻叶片黄化、后期早衰加剧,进而影响水稻产量和品质。突变体pgl 还表现对高温的敏感,以及低光强下的活性氧清除系统受损,而致使水稻叶片表现早衰。利用该基因信息,通过对不同品种PGL等位基因变异的筛选和比较,将为探索抗早衰水稻新品种培育提供新思路。
 
叶片早衰是影响水稻产量和品质的重要因素。在水稻育种和栽培管理中,延缓叶片衰老成为保障水稻高产、稳产的重要手段。但长期以来,有关水稻叶片衰老的遗传调控机制仍不清楚。



原文链接:
 
PGL, encoding chlorophyllide a oxygenase 1, impacts leaf senescence and indirectly affects grain yield and quality in rICE
 
原文摘要:
 
Chlorophyll (Chl) b is a ubiquitous accessory pigment in land plants, green algae, and prochlorophytes. This pigment is synthesized from Chl a by chlorophyllide a oxygenase and plays a key role in adaptation to various environments. This study characterizes a rice mutant, pale green leaf (pgl), and isolates the gene PGL by using a map-based cloning approach. PGL, encoding chlorophyllide a oxygenase 1, is mainly expressed in the chlorenchyma and activated in the light-dependent Chl synthesis process. Compared with wild-type plants, pgl exhibits a lower Chl content with a reduced and disorderly thylakoid ultrastructure, which decreases the photosynthesis rate and results in reduced grain yield and quality. In addition, pgl exhibits premature senescence in both natural and dark-induced conditions and more severe Chl degradation and reactive oxygen species accumulation than does the wild-type. Moreover, pgl is sensitive to heat stress.
 
doi: 10.1093/jxb/erv529

日期:2016-01-03     来源:生物帮       网址:http://www.bio1000.com/gnjz/botany/505325.html