干旱胁迫对引种辣椒生长特性的影响

以引种辣椒Jalapeno Early Hot Portugal Hot Sweet Banana 为材料利用自动灌溉系统控制基质不同含水量，包括5%,10%,15%,20%,25%,CK研究3 个辣椒品种对干旱胁迫的响应。结果表明院随着基质含水量的减少，3 个品种叶面积、叶绿素SPAD 值、相对含水量和水势均呈下降趋势，而根干重、根冠比和脯氨酸含量则逐渐升高；基质相对含水量为5%时，Jalapeno Early Hot 的叶面积、叶绿素含量、相对含水量、水势分别比对照下降9.79%,10.76%,8.03%和79.45%根干重、根冠比和脯氨酸增加19.43%,26.82%和201.85%,Sweet Banana 的叶面积、叶绿素含量,相对含水量水势比对照分别下降18.05%、13.51%、17.70%和149.23%，根干重、根冠比和脯氨酸增加28.79%,33.17%和115.19%说明可以通过叶片特征的调整使辣椒适应干旱胁迫其中Jalapeno Early Hot 最强Portugal Hot居中Sweet Banana 适应能力最弱。

Effects of drought stress on growth characteristicsof introduced pepper

By controlling the water content (5%, 10%, 15%, 20% and 25%) of matrix using automatic irrigationsystem, the leaf characteristics responses of three introduced peppers (i.e. Jalapeno Early Hot, Portugal Hot and Sweetbanana) to drought stress were studied. The results showed that, compared with the control (25% water content), the leafarea, chlorophyll SPAD, relative water content and water potential of Jalapeno Early Hot treated with 5% water contentwere decreased by 9.79%, 10.76%, 8.03% and 79.45% respectively, and those for Sweet Banana were decreased by18.05%, 13.51%, 17.70% and 149.23% respectively. Meanwhile, the root dry mass, root crown ratio and proline contentincreased by 19.43%, 26.82%, 201.85% respectively for Jalapeno Early Hot and 28.79%, 33.17%, 115.19% for SweetBanana. The same trend was observed for Portugal Hot. These results indicate that pepper adapts to drought stress viaadjusting its leaf characteristics. Accordingly, Jalapeno Early Hot showed the highest drought-resistance ability, followedby Portugal Hot and Sweet banana.