水分条件对红松和西伯利亚红松针叶脯氨酸与叶绿素含量的影响

Effects of Water Conditions on Proline and Chllorophy Contents in Pinus koraiensis and Pinus sibirica

以盆栽3年生红松和西伯利亚红松为材料，设置4种水分条件，土壤含水量分别为：29％～31％（C），22％～24％（L），15％～17％（M）和渍水组（W），研究不同水分条件下红松和西伯利亚红松当年生针叶和往年生针叶的脯氨酸含量和叶绿素含量变化。结果表明：1）脯氨酸含量在不同叶龄和不同树种之间存在差异。红松当年生针叶叶绿素含量高于往年生针叶，而西伯利亚红松则相反。总体上西伯利亚红松的脯氨酸含量高于红松；2）2树种在渍水条件下脯氨酸含量大量积累，红松在处理后一个月即出现胁迫反应，早于西伯利亚红松。土壤含水量在15％～17％时已对2种红松的往年生针叶产生胁迫，但对红松的胁迫程度大于西伯利亚红松；3）叶绿素积累与2种红松的耐水分胁迫能力相关性不大；4）西伯利亚红松的水分适应范围大于红松；2种红松的当年生针叶的耐水分胁迫能力均大于往年生针叶。

Effects of different water conditions on proline and chlorophyll contents in current-needles and previous-needles of Pinus koraiensis and P. sibirica were studied. Three-year-old potted P. koraiensis and P. sibirica were taken as materials with four water regimes： 29% - 31% （C）, 22% - 24% （L）, 15% - 17% （M） and waterlogging condition（W）. The results were as follows： 1 ） proline content varied with leaf age and species. Chlorophyll content of current-needles was higher than that of previousneedles in P. koraiensis, and it was opposite in P. sibirica. Proline content in P. koraiensis was generally higher than that in P. sibirica; 2） proline content was accumulated significantly in both two species under waterlogging. Water stress appeared after one month treatment in P. koraiensis, and this was earlier than in P. sibirica. The previous-needles of both two species was under water stress as the soil water contents reached 15% - 17%, but the effect in P. koraiensis was larger than in P. sibirica. 3） The accumulation of chlorophyll content had little correlation with the capacity of resistance to water stress in the two species; 4）P. sibirica had wider water fitting range than P. koraiensis; the capacity of resist- ance to water stress in current-needles was bigger than that in previous-needles in both two species.