摘要
Two rice cDNAs (rTip1 and rMip1) homologous to soybean nodulin 26 and Arabidopsis γ Tip, encoding major intrinsic protein (Mip) were isolated. The rTip1 was expressed in shoots and roots of rice seedlings and induced by water stress, salt stress and exogenous ABA. The rMip1 was expressed only in rice shoots. Although the mRNA level of rMip1 in the shoots was induced to a small extent by exogenous ABA, it did not show any increase under water or salt stress within the course of 12 h . On the basis of the different expression patterns and evolutionary distinctions of the above Mips, it is suggested that the possible Mip channel proteins encoded by the rTip1 and rMip1 genes may function in different transport systems.
Two rice cDNAs (rTip1 and rMip1) homologous to soybean nodulin 26 and Arabidopsis γ Tip, encoding major intrinsic protein (Mip) were isolated. The rTip1 was expressed in shoots and roots of rice seedlings and induced by water stress, salt stress and exogenous ABA. The rMip1 was expressed only in rice shoots. Although the mRNA level of rMip1 in the shoots was induced to a small extent by exogenous ABA, it did not show any increase under water or salt stress within the course of 12 h . On the basis of the different expression patterns and evolutionary distinctions of the above Mips, it is suggested that the possible Mip channel proteins encoded by the rTip1 and rMip1 genes may function in different transport systems.
