The role of late embryogenesis abundant （LEA） proteins in stress tolerance was examined by using a yeast expression system. LEA protein tolerance to the abotic stresses in plants involved in salt, drought and freezi...The role of late embryogenesis abundant （LEA） proteins in stress tolerance was examined by using a yeast expression system. LEA protein tolerance to the abotic stresses in plants involved in salt, drought and freezing stresses and additional tolerance to heat, NaHCO3 （salt-alkali） and ultraviolet radiation was also investigated. The transgenic yeast harboring the Tamarix LEA gene （DQ663481） was generated under the control of inducible GAL promoter （pYES2 vector）, yeast cells transformed with pYES2 empty vector were also generated as a control. Stress tolerance tests showed that LEA yeast transformants exhibited a higher survival rates than the control transformants under high temperature, NaHCO3, ultraviolet radiation, salt （NaCl）, drought and freezing, indicating that the LEA gene is tolerant to these abiotic stresses. These results suggest that the LEA gene is resistant to a wider repertoire of stresses and may play a common role in plant acclimation to the examined stress conditions.展开更多
Drought is one of the most damaging abiotic stress. Different plants response differently to drought stress. Abiotic stresses such as drought induced diverse physicological and molecular responses in plants. These res...Drought is one of the most damaging abiotic stress. Different plants response differently to drought stress. Abiotic stresses such as drought induced diverse physicological and molecular responses in plants. These responses include changes in gene expression. One of drought tolerance gene is a gene encoding dehydrin which is belongs to the group II or D-11 LEA protein family. LEA-D11 gene produce dehydrin protein which has a role in stabilization of membrane structures and protection of macromolecules in the presence of drought. The aims of the study was to identify and to characterize the LEA-D11 gene in various soybean varieties. This research used seven varieties of soybean: Tanggamus, Nanti, Seulawah, Tidar (drought tolerant), Wilis and Burangrang (drought moderate) and Detam-1 (drought susceptible). DNA genome of those varieties was isolated using the methods from Doyle & Doyle [1]. DNA amplification was conducted using Polymerase Chain Reaction (PCR) with specific primers designed based on GmLEA-D11 gene sequence database from the NCBI. The DNA targets were sequenced using automatic sequencing machine, ABI 3130xl Genetic Analyzer, in Eijkman Institution. The result of this study showed that the sequences of Gm-LEA-D11 gene possessed by drought tolerance varieties (Tanggamus, Nanti, Seulawah and Tidar) and moderately tolerance (Wilis and Burangrang) were similar. However, the sequence of GmLEA-D11 gene detected in the drought susceptible variety Detam-1 was different from the two groups. Similarity between drought tolerance and moderately tolerance indicate that there is not only LEA-D11 gene responsible to drought tolerance but also others. The primer and sequences GmLEA-D11 gene can be used as molecular marker and capable of differentiating between drought susceptible and drought moderate to drought tolerant.展开更多
首次从长春花中克隆了Crlea（Crlea for Catharanthus roseus late embryogenesis abundant）的全长基因,采用荧光定量PCR方法对干旱胁迫下长春花叶片和根部Crlea基因的表达模式进行监测,结果表明,在0.5～8h的胁迫时间中,叶片和根部的Cr...首次从长春花中克隆了Crlea（Crlea for Catharanthus roseus late embryogenesis abundant）的全长基因,采用荧光定量PCR方法对干旱胁迫下长春花叶片和根部Crlea基因的表达模式进行监测,结果表明,在0.5～8h的胁迫时间中,叶片和根部的Crlea基因表现出相似的积累模式.长春花Crlea基因的表达随着胁迫时间的延长而表达增强.在叶片中,在6 h和8 h的干旱处理后,Crlea基因表达显著提高,分别是未处理材料的9.984和20.431倍.在根部, 在8 h的处理后,Crlea基因的表达量显著提高（2.831倍于对照）.初步结果表明Crlea基因的表达没有组织特异性,并且为干旱胁迫正调控.展开更多
基金National Key Program on Basic Research and Development of China (G1999016003)
文摘The role of late embryogenesis abundant （LEA） proteins in stress tolerance was examined by using a yeast expression system. LEA protein tolerance to the abotic stresses in plants involved in salt, drought and freezing stresses and additional tolerance to heat, NaHCO3 （salt-alkali） and ultraviolet radiation was also investigated. The transgenic yeast harboring the Tamarix LEA gene （DQ663481） was generated under the control of inducible GAL promoter （pYES2 vector）, yeast cells transformed with pYES2 empty vector were also generated as a control. Stress tolerance tests showed that LEA yeast transformants exhibited a higher survival rates than the control transformants under high temperature, NaHCO3, ultraviolet radiation, salt （NaCl）, drought and freezing, indicating that the LEA gene is tolerant to these abiotic stresses. These results suggest that the LEA gene is resistant to a wider repertoire of stresses and may play a common role in plant acclimation to the examined stress conditions.
文摘Drought is one of the most damaging abiotic stress. Different plants response differently to drought stress. Abiotic stresses such as drought induced diverse physicological and molecular responses in plants. These responses include changes in gene expression. One of drought tolerance gene is a gene encoding dehydrin which is belongs to the group II or D-11 LEA protein family. LEA-D11 gene produce dehydrin protein which has a role in stabilization of membrane structures and protection of macromolecules in the presence of drought. The aims of the study was to identify and to characterize the LEA-D11 gene in various soybean varieties. This research used seven varieties of soybean: Tanggamus, Nanti, Seulawah, Tidar (drought tolerant), Wilis and Burangrang (drought moderate) and Detam-1 (drought susceptible). DNA genome of those varieties was isolated using the methods from Doyle & Doyle [1]. DNA amplification was conducted using Polymerase Chain Reaction (PCR) with specific primers designed based on GmLEA-D11 gene sequence database from the NCBI. The DNA targets were sequenced using automatic sequencing machine, ABI 3130xl Genetic Analyzer, in Eijkman Institution. The result of this study showed that the sequences of Gm-LEA-D11 gene possessed by drought tolerance varieties (Tanggamus, Nanti, Seulawah and Tidar) and moderately tolerance (Wilis and Burangrang) were similar. However, the sequence of GmLEA-D11 gene detected in the drought susceptible variety Detam-1 was different from the two groups. Similarity between drought tolerance and moderately tolerance indicate that there is not only LEA-D11 gene responsible to drought tolerance but also others. The primer and sequences GmLEA-D11 gene can be used as molecular marker and capable of differentiating between drought susceptible and drought moderate to drought tolerant.
