Two functionally different vacuoles for static and dynamic purposes in one plant mesophyll leaf cell

被引：49

作者：

Epimashko, S ^{[1
]}

Meckel, T ^{[1
]}

Fischer-Schliebs, E ^{[1
]}

Lüttge, U ^{[1
]}

Thiel, G ^{[1
]}

机构：

[1] TH Darmstadt, Inst Bot, D-64287 Darmstadt, Germany

来源：

PLANT JOURNAL | 2004年 / 37卷 / 02期

关键词：

crassulacean acid metabolism (CAM); malate channel; Mesembryanthemum crystallinum; redox regulation; salt stress; vacuolar function;

D O I：

10.1046/j.1365-313X.2003.01958.x

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

It is a common belief that plant mesophyll cells are occupied up to 95% by a single multipurpose vacuole. The common ice plant, Mesembryanthemum crystallinum L., however, requires two contrasting functions of the vacuole under salt stress. Large amounts of NaCl have to be sequestered permanently for osmotic purpose and for protecting the cytoplasm from NaCl toxicity. A dynamic exchange with the cytoplasm is required because photosynthesis proceeds under these conditions via the metabolic cycle of crassulacean acid metabolism (CAM). Nocturnally acquired CO2 must be kept as malate in the vacuole and re-mobilized in the daytime. Here, we show that two large independent types of vacuoles with different transport properties meet the requirements for the contrasting functions within the same cell.

引用

页码：294 / 300

页数：7

共 23 条

[1] Na+/H+ exchange in the halophyte Mesembryanthemum crystallinum is associated with cellular sites of Na+ storage [J].