响应滞差作为度量杨树耐旱性指标的可能性(Ⅰ)  

A Possible Index for Drought Tolerance-Response Lag(Ⅰ)

作　　者：胡新生[1] 王世绩[1] 

机构地区：[1]中国林业科学研究院林业研究所

出　　处：《东北林业大学学报》1997年第4期1-9,共9页Journal of Northeast Forestry University

基　　金：FAO和UNDP援助项目

摘　　要：为探讨响应滞差作为一种度量植物耐旱性指标的可能性。选择两个杨树无性系，群众杨４４和欧美杨２５／８６，应用多因子试验，研究在水分胁迫和不同温、湿条件下净光合速率（Ｐｎ）与对光量子密度（Ｉ）以余弦波形式连续刺激下的滞差响应。应用谐波分析法估计滞差的时间。结果表明，随着胁迫程度的加深，Ｐｎ与Ｉ的关系由线性相关逐步转为非线性关系，滞差时间由短变长，温度、湿度对这种变化有一定影响。响应滞差（Δｔ）及Ｐｎ与Ｉ的相关关系与无性系的耐旱性有一定关系。因此，响应滞差有可能成为度量杨树无性系耐旱性的指标，用于无性系筛选。A possible index for measuring drought tolerance, the response lag, was presented A multilevel factorial experiment was established where temperature, humidity and water stress were varied for Populus popularis 44 (Clone C) of drought tolerance and P euramericana 25/28 (Clone D) of drought sensitive by hydroponic method The instaneous reaponses of the net photosynthesis rate (P n) to photosynthetically active photon flux density (Ⅰ), which was continually changed according to a pattern of cosine function, were monitored The response lags were estimated by harmonic wave analysis Results indicated that the relationship between P n and I was variable, but predictable With the increase of water stress, the relationship changed from linear to non-linear, and the response time lag from short to long These response patterns could be modified by diffrent temperature and relative humidity They were also correlated with clones of different levels drought tolerance The response lag might be a good predictor for screening clones of drought tolerance

关 键 词：杨树 耐旱性 响应滞差 温度 相对湿度 

分 类 号：S792.110.1[农业科学—林木遗传育种]