S-stapfianus and E-curvula cv. Consol in vivo photosynthesis, PSII activity and ABA content during dehydration
S-stapfianus and E-curvula cv. Consol in vivo photosynthesis, PSII activity and ABA content during dehydration
复制标题
DOI：
10.1023/b:grow.0000009705.25848.e7
复制
发表时间：
1998-07-01
影响因子：
4.2
通讯作者：
Vazzana, C
中科院分区：
文献类型：
--
作者：
Di Blasi, S;Puliga, S;Vazzana, C
以弯穗画眉草为材料，研究了弯穗画眉草光合活性、CO2同化速率、Phi（PSII）和阿坝含量的变化。康索尔和Sporobolus stapfianus Gandoger对脱水的反应。第一个是一个温暖的季节草很好地适应干旱和第二个耐干燥或复苏的植物。在整个植物干燥过程中对完整叶片进行试验。经过一个循环的脱水（下降到5%RWC）和复水完全膨压复苏植物表现出恢复光合能力。E.弯孢属抗旱性强，但不耐旱，干燥至20%RWC时不能恢复。光合作用对干燥处理的敏感性在E. curvula和S. stapfianus。在干燥处理过程中，叶片失水量达40%时，E.弯孢光合作用似乎受到碳代谢的抑制，因为PSII活性尚未受到影响。In S.在同一脱水点上，高RWC下，葡萄光合作用仍能正常进行，但PSII活性（Fv/Fm）下降。非光化学叶绿素荧光猝灭（qN）进行了分析。在干燥过程中，两种植物的qN都有所增加，但复活植物的qN增加更多，尽管其同化速率受影响较小。讨论了阿坝在调节CO2同化速率中的重要性。
Changes in photosynthetic activity, CO2 assimilation rate, Phi(PSII) by fluorescence and ABA content, were monitored in the grasses Eragrostis curvula cv. Consol and Sporobolus stapfianus Gandoger in response to dehydration. The first being a warm season grass well adapted to drought and the second a desiccation-tolerant or resurrection plant. The trial was performed on intact leaves during a whole plant drying course. After a cycle of dehydration (down to congruent to 5% RWC) and rehydration to full turgor the resurrection plant showed recovery of photosynthetic capability. E. curvula is drought-resistant but not drought-tolerant being not capable of recovering when dried to congruent to 20% RWC. The sensitivity of photosynthesis to the drying treatment was different in E. curvula and S. stapfianus. During drying treatment, up to a leaf water loss of congruent to 40,%, E. curvula photosynthesis seemed to be inhibited by carbon metabolism, because PSII activity was not yet affected. In S. stapfianus at the same point of dehydration photosynthesis still worked though a down-regulation of PSII activity (Fv/Fm) occurred at a higher RWC. Nonphotochemical chlorophyll fluorescence quenching (qN) was analysed. During drying qN increased in both plants, but more in the resurrection plant though its assimilation rate was less affected. The importance of ABA in regulating CO2 assimilation rate is discussed.