Studies on the molecular and physiological role of PMP3, which is involved in membrane depolarization, in the environmental stress responses of rice

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Most crop plants are sensitive to high salinity and the growth is repressed in saline soil, which is increasing these years. To elucidate the mechanism of salt tolerance of plants, we have isolated PMP3 gene family, which is involved in membrane depolarization in yeast cells, from rice and analyzed the expression and function of rice PMP3 (OsPMP3) genes. We have found that OsPMP3 is also involved in salt tolerance via repressing salt uptake into the cells in rice. We suggest that OsPMP3 genes are good candidates for improving salt tolerance of rice plants using a gene transformation technique.