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[盐胁迫对中华补血草叶绿素和有机溶质含量的影响]

[Effects of salt stress on the contents of chlorophyll and organic solutes in Aeluropus littoralis var. sinensis Debeaux].

作者信息

Liu Zhi-Hua, Shi Li-Ran, Bai Li-Rong, Zhao Ke-Fu

机构信息

Department of Life Sciences, Hengshui College, Hengshui, Hebei 053000, China; Institute of Plant Stress, Shandong Normal University, Jinan 250014, China; E-mail:

出版信息

Zhi Wu Sheng Li Yu Fen Zi Sheng Wu Xue Xue Bao. 2007 Apr;33(2):165-72.

Abstract

After seedlings of Aeluropus sinensis var. sinensis Debeaux were treated with different NaCl concentrations (0-200 mmol/L) for 14 days, some physiological indexes were measured. The higher the NaCl concentration, the more the growth of A. sinensis was inhibited. The increase in root/shoot ratio suggests that the shoots are more sensitive to salinity than the roots. The diminished leaf area may reduce the transpiration rate, and the root mainly grew longitudinally, which may help the root to reach the water source under the high salinity conditions. Chl a contents increased, so did Chl b, but the Chl a/Chl b ratio declined, which implies the stimulation of Chl a accepted from NaCl is smaller than that of Chl b. After salt treatment, the organic solute contents increased (P<0.05), the proline, amino acids and soluble sugar contents increased more than organic acids, the increase in soluble carbohydrate may inhibit photosynthesis in feedback. The percentage of sucrose in soluble carbohydrates increased too. Although the organic dry weight of whole plant declined, the proportion of organic dry weight in total dry weight increased, and the osmotic potential of plant cell juice declined, which implies that the contribution of organic matter to osmotic adjustment increased with salinity. That is, A. sinensis had ability to tolerate salinity to a certain degree.

摘要

用不同浓度(0 - 200 mmol/L)的NaCl处理中华补血草幼苗14天后,测定了一些生理指标。NaCl浓度越高,中华补血草的生长受抑制越明显。根冠比增加表明地上部分比根对盐分更敏感。叶面积减小可能会降低蒸腾速率,且根主要纵向生长,这可能有助于根在高盐条件下获取水源。叶绿素a含量增加,叶绿素b含量也增加,但叶绿素a/叶绿素b比值下降,这意味着NaCl对叶绿素a的促进作用小于对叶绿素b的促进作用。盐处理后,有机溶质含量增加(P<0.05),脯氨酸、氨基酸和可溶性糖含量的增加幅度大于有机酸,可溶性碳水化合物的增加可能会反馈抑制光合作用。可溶性碳水化合物中蔗糖的占比也增加。虽然全株有机干重下降,但有机干重在总干重中的比例增加,且植物细胞汁液的渗透势下降,这表明随着盐分增加,有机物对渗透调节的贡献增大。即中华补血草具有一定的耐盐能力。

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