Abstract
Crop production is often reduced by drought, high salinity, and nonoptimal temperatures. The cellular and molecular responses of plants to environmental stress have been studied intensively. The genes encoding late embryogenesis abundant (LEA) proteins are consistently represented in differential screens for transcripts with increased levels during drought. The Vigna radiata VrDHN gene which is a Y2K-type dehydrin belongs to the Group 2 LEA proteins. In the study, pressure-volume curve of mungbean leaf was plotted to obtain parameters of water status. Turgor pressure is an important factor that signals the water status of plant cells. The VrDHN mRAN expression is significantly affected by turgor loss. Our results showed that turgor potential of 0.10 MPa is the threshold for the remarkably increase of VrDHN transcripts under water stress.