Mechanism of genetic regulation of rice to salt atress

水稻发育及某些生化反应的研究对幼苗对盐胁迫的反应进行了研究。当幼苗暴露在中等水平的盐度(氯化钠)下时，地上部和更严重的根的生长都受到限制。解剖观察表明，在正常生长条件下，水稻种子萌发后3d即可在根中形成透气组织。通风组织的发育还伴随着根部厚壁组织和维管组织的发育。相反，在盐胁迫下，在相同生长阶段的根中没有观察到通风组织的形成。详细的组织学观察表明，盐胁迫抑制了厚壁组织和维管分子的发育。盐胁迫还引起了根组织在次生壁形成方面的其他几个解剖变化，以及一些仅与厚壁组织和维管组织相关的紫外光荧光物质。比较盐处理和未处理根组织的蛋白质谱表明，盐胁迫显著抑制了几种多肽的合成。它们在正常组织中的出现可能与充气组织的发育有关。提供了使用几种蛋白质的抗体和电子显微镜进行进一步分析的数据。

Developmental and some biochemical responses of rice (Oryza sativa L.) seedlings to salt stress were studied. Shoot and more critically root growth were limited when the seedlings were exposed to moderate levels of salinity (NaCl). Anatomical observations revealed that under normal growth conditions, aerenchyma formation in rice roots occurred 3 days after seed germination. Development of aerenchyma was also accompanied by well developed sclerenchyma and vascular tissues in roots. In contrast, under salt stress aerenchyma formation was not observed in roots of comparable growth stages. Detailed histological observations showed the developmental retardation of sclerenchyma and vascular elements by salt stress. Salinity stress also caused several other anatomical changes of root tissues with regard to secondary wall formation in vascular tissues and some UV-fluorescent substances observed exclusively associated with sclerenchyma and vascular tissues.Comparison of protein profiles from salt-treated and untreated root tissues indicated that the synthesis of several polypeptides was significantly suppressed by salt stress. Appearance of these in normal tissues could be correlated with aerenchyma development. Data on further analysis using antibodies of several proteins and electron microscopy are presented.