Barley plasma membrane intrinsic proteins (PIP aquaporins) as water and CO2 transporters
Barley plasma membrane intrinsic proteins (PIP aquaporins) as water and CO2 transporters
复制标题
DOI：
10.1007/s00424-007-0434-9
复制
发表时间：
2008-07-01
影响因子：
4.5
通讯作者：
Hanba, Yuko T.
中科院分区：
文献类型：
--
作者：
Katsuhara, Maki;Hanba, Yuko T.
我们鉴定了大麦水通道蛋白，并证明了其中一个，HvPIP 2;1，运输水和CO2。在植物水分平衡方面，水通道蛋白的表达在多种环境胁迫下受到调节。在盐胁迫下，一些质膜型水通道蛋白表达下调，可以防止持续脱水导致细胞死亡。与野生型水稻植株的叶片相比，表达最大量HvPIP 2;1的转基因水稻植株的叶片显示内部CO2电导增加40%。转基因植株的CO2同化率也有所提高。我们植物水通道蛋白研究的目标是确定负责水和CO2运输的关键水通道蛋白种类，并通过水通道蛋白的分子育种来改善植物水分关系，胁迫耐受性，CO2吸收或同化以及植物生产力。
We identified barley aquaporins and demonstrated that one, HvPIP2;1, transports water and CO2. Regarding water homeostasis in plants, regulations of aquaporin expression were observed in many plants under several environmental stresses. Under salt stress, a number of plasma membrane-type aquaporins were down-regulated, which can prevent continuous dehydration resulting in cell death. The leaves of transgenic rice plants that expressed the largest amount of HvPIP2;1 showed a 40% increase in internal CO2 conductance compared with leaves of wild-type rice plants. The rate of CO2 assimilation also increased in the transgenic plants. The goal of our plant aquaporin research is to determine the key aquaporin species responsible for water and CO2 transport, and to improve plant water relations, stress tolerance, CO2 uptake or assimilation, and plant productivity via molecular breeding of aquaporins.