Effects of phosphate deficiency on the lipid composition in cucumber thylakoid membranes and PSII particles
Effects of phosphate deficiency on the lipid composition in cucumber thylakoid membranes and PSII particles
复制标题
缺磷对黄瓜类囊体膜和 PSII 颗粒脂质组成的影响
DOI：
10.1016/j.plantsci.2004.02.010
复制
发表时间：
2004
期刊：
影响因子：
5.2
通讯作者：
T. Kuang
中科院分区：
文献类型：
--
作者：
W. Yang;Shuang Liu;F. Feng;Haitong Hou;G. Jiang;Yinong Xu;T. Kuang
磷脂酰甘油（PG）是类囊体膜中唯一的磷脂。缺磷明显影响了黄瓜叶片类囊体膜的脂质组成。缺磷导致黄瓜叶片中PG含量减少，同时双半乳糖二酰甘油（DGDG）和磺基喹诺酰二酰甘油（SQDG）含量增加。虽然缺磷导致类囊体PG减少44mol%，但缺磷下的叶绿素荧光系数和光系统II（PSII）释氧活性与磷充足下相比几乎没有差异。研究表明，磷酸盐缺乏对 PSII 功能没有明显影响。此外，在缺磷条件下，PSII中的PG仍保持较高水平。这些结果表明，缺磷会导致某些类囊体膜域中的PG减少，但对类囊体PSII膜域中的PG含量影响不大。也许，类囊体膜中存在两种类型的PG。有些PG分子只在类囊体膜的结构中发挥作用，缺磷时其他脂质分子如SQDG可以替代它们，而有些PG分子可能在维持PSII的结构和功能中发挥重要作用，其他脂质分子无法替代它们。
Phosphatidylglycerol (PG) is the sole phospholipid in thylakoid membranes. Phosphate deficiency clearly affected the thylakoid membrane lipid composition of cucumber leaves. Phosphate deficiency induced the decrease in PG content and the concomitant increases in the content of digalactosyl diacylglycerol (DGDG) and sulfoquinovosyl diacylglycerol (SQDG) in cucumber leaves. Although phosphate deficiency led to the 44mol% decrease of thylakoid PG, the chlorophyll fluorescence coefficients and photosystem II (PSII) oxygen-evolving activity under phosphate deficiency showed virtually no difference compared with those under phosphate sufficiency. It was suggested that phosphate deficiency had no clear effect on PSII function. Besides, PG still maintained in a high level in PSII under phosphate-deficient conditions. These results showed that phosphate deficiency could result in PG decrease in some thylakoid membrane domains but had little effect on the content of PG existed in PSII membrane domains of thylakoid. Maybe, there were two types of PG in thylakoid membrane. Some PG molecules only played a role in the structure of thylakoid membrane and other lipid molecules such as SQDG can substitute for them under phosphate deficiency while some PG molecules may play an important role in maintaining the structure and function of PSII and other lipid molecules cannot substitute for them.
影响因子：
2.9
作者：
Gombos, Z;Várkonyi, Z;Wada, H
通讯作者：
Wada, H