盐胁迫对4个水稻种质抗逆性生理的影响

Effects of Salt Stress on Resistance Physiology of Four Rice Germplasms

摘要:

为筛选水稻（Oryza sativa）耐盐种质资源，研究了水稻耐盐相关生理指标。结果表明，盐胁迫下，耐盐种质Pokkali、Fl478、JX99的电导率较低，细胞膜透性较小，叶片叶绿素含量较高，受盐害程度较弱。盐胁迫促进了丙二醛的大量积累，加剧了细胞膜脂过氧化程度，而耐盐种质的丙二醛积累较少，但高盐胁迫下3个耐盐种质的丙二醛含量升高，破坏了细胞膜的完整性。感盐种质R29的临界饱和亏的增幅较大，耐盐种质相对含水量降幅小。应用模糊隶属函数法综合评价，4个水稻种质的耐盐性依次为JX99 > Pokkali > FL478 > IR29。

Abstract:

In order to select salt-tolerance germplasms of rice (Oryza sativa) germplasms, the physiological indexes related salt tolerance were studied under salt stress. The results showed that the salt tolerance germplasms, such as Pokkali, Fl478 and JX99, had low conductivity, small cell membrane permeability, and high chlorophyll content in leaf, showing weak salt damage. The malondialdehyde content, the degree of cell membrane lipid peroxidation increased under salt stress. The malondialdehyde accumulated in salt-tolerant germplasm less than that in sensitive germplasm, but the malondialdehyde content in three salt-tolerant germplasms also increased under high salt stress, which destroyed the integrity of cell membrane. The critical saturation deficit in sensitive germplasm R29 greatly enhanced, while the relative water content in salt-tolerant germplasms slightly decreased. So, the order of salt tolerance was JX99 > Pokkali > FL478 > IR29 by fuzzy membership function method.