设为主页 加入收藏 联系我们
当前位置:您现在的位置: 作物生理生态与栽培研究中心 >> 科研进展 >> 正文科研进展
一种糖脂可使植物在缺磷环境下维持生长
发布日期:2013/3/7 17:46:03 浏览次数:4173
氮、磷、钾是植物生长必需的三大元素,缺磷会导致植物矮小,果实不饱满。日本科学家发现植物体内一种糖脂可使它们在缺磷的环境下维持生长,并确定了指导合成这种糖脂的基因。这将帮助科学家培育耐缺磷环境的农作物。
日本理化研究所和科学技术振兴机构日前联合发表新闻公报说,植物的生物膜主要由磷脂和糖脂等构成,当植物体内缺乏磷元素时,生物膜中的磷脂就会减少,与此同时,一些糖脂就会增加弥补磷脂的不足,从而维持生物膜,帮助植物正常生长。这种现象叫做膜脂质的重组,对植物在缺磷环境下生存起到重要作用。但是,具体是哪种化合物如何参与膜脂质重组,一直没有被明确。
理化研究所植物科学研究中心的团队借助独立研发的细胞内低分子代谢产物全面分析法,分析了在缺磷环境下生长的拟南芥体内的膜脂质重组,发现一种名为葡萄糖醛酸糖脂的物质在拟南芥植株的地上部分积蓄。这种糖脂之前只在部分微生物体内发现过。
研究人员还培育出和植物体内一些糖脂合成相关的基因缺损的拟南芥,发现拟南芥如果没有SQD2基因,葡萄糖醛酸糖脂就不能积蓄,在缺磷环境下就会比正常拟南芥植株更早枯死。(来源:新华社)
 
A new class of plant lipid is essential for protection against phosphorus depletion
AmandaPisces 添加于 2013-3-5 10:54:09 48次阅读 | 0次推荐 | 0个评论

Highlighting toolCompoundsGenes and ProteinsUpdate HighlightingAbstractAbstractAuthor informationSupplementary informationPhosphorus supply is a major factor responsible for reduced crop yields. As a result, plants utilize various adaptive mechanisms against phosphorus depletion, including lipid remodelling. Here we report the involvement of a novel plant lipid, glucuronosyldiacylglycerol, against phosphorus depletion. Lipidomic analysis of Arabidopsis plants cultured in phosphorus-depleted conditions revealed inducible accumulation of glucuronosyldiacylglycerol. Investigation using a series of sulfolipid sulfoquinovosyldiacylglycerol synthesis-deficient mutants of Arabidopsis determined that the biosynthesis of glucuronosyldiacylglycerol shares the pathway of sulfoquinovosyldiacylglycerol synthesis in chloroplasts. Under phosphorus-depleted conditions, the Arabidopsis sqd2 mutant, which does not accumulate either sulfoquinovosyldiacylglycerol or glucuronosyldiacylglycerol, was the most severely damaged of three sulfoquinovosyldiacylglycerol-deficient mutants. As glucuronosyldiacylglycerol is still present in the other two mutants, this result indicates that glucuronosyldiacylglycerol has a role in the protection of plants against phosphorus limitation stress. Glucuronosyldiacylglycerol was also found in rice, and its concentration increased significantly following phosphorus limitation, suggesting a shared physiological significance of this novel lipid against phosphorus depletion in plants.

作 者:Yozo Okazaki; Hitomi Otsuki; Tomoko Narisawa; Makoto Kobayashi; Satoru Sawai; Yukiko Kamide; Miyako Kusano; Toshio Aoki; Masami Yokota Hirai; Kazuki Saito
期刊名称: Nature Communications
期卷页: 2013-02-26 第4卷 第期 1510~页
学科领域:生命科学 » 植物学 » 植物生理与生化
添加人是否为作者:
原文链接:
http://www.nature.com/ncomms/journal/v4/n2/abs/ncomms2512.html
DOI: doi:10.1038/ncomms2512
ISBN:
关键词: Biological sciences, Biochemistry, Biotechnology, Plant sciences
备 注:
2011-2011 华中作物生理生态与栽培研究中心 CPPC版权所有
武汉 华中农业大学 邮编:430070 电话:027-87288188