盐胁迫下红树植物秋茄(Kandelia candel)热值变化的研究

 研究了盐胁迫强度对培养170d的秋茄(Kandelia candel)幼苗根、茎、叶和胚轴热值及灰分含量的影响。结果表明盐胁迫强度对胚轴的热值及灰分含量的影响不明显，而根、茎和叶的热值及灰分含量明显受基质盐度影响。低盐条件下，根、茎和叶的热值随盐胁迫强度的提高而提高，而高盐胁迫时又随盐胁迫强度的提高而下降，与根、茎和叶的最高热值相对应的基质盐度分别为15‰、25‰和30‰。盐度15‰左右是秋茄幼苗最适生长区。热值可作为植物抗盐性的生理指标之一。

CHANGES IN THE CALORIC VALUES OF KANDELIA CANDEL SEEDLINGS UNDER SALT STRESS

The paper deals with the influence of salinity on the changes in caloric values and ash contents of different parts of Kandelia candel seedlings cultivated for 170 days. The results indicate that the medium salinity had little influence on the caloric values and ash contents of hypocotyls other than those of root, stem and leaf. The caloric values of root, stem, and leaf increased with the salt stress at low salinity, and decreased with the salt stress at high salinity. The caloric values of root, stem and leaf reached the peak under the medium salinity of 15‰,20‰ and 25‰ ,respectively. The medium salinity of 15‰ was the upper limit for the normal living of K. candel The caloric value was a good physiological index for determining salt-resistance of species.