Endophyte infection accelerates morpho-physiological responses to water deficit in tall fescue
Endophyte infection accelerates morpho-physiological responses to water deficit in tall fescue
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DOI：
10.1080/00288233.2006.9513726
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发表时间：
2006-12-01
影响因子：
1.8
通讯作者：
Posse, M. A.
中科院分区：
文献类型：
--
作者：
Assuero, S. G.;Tognetti, J. A.;Posse, M. A.
内生菌感染的高羊茅植物（E+）通常比无内生菌的植物（E-）在水分亏缺下更持久。其原因尚不清楚，因为关于生长和水分状况变量的报告相互矛盾。通过温室试验，比较了E+和E-高羊茅植物在一个水分亏缺和恢复周期中的形态生理反应。在非限制性条件下，E+植物中每个容器的总干质量高于E-植物。然而，没有发现内生菌处理之间的根冠比，水分状况或叶片或分蘖基地的还原糖含量的差异。在水分限制条件下，E+植物对水分亏缺的反应加快。相对陡峭的生长停止，以及更高的叶和根衰老在E+比在E-与更高的积累的糖在茎基部的E+植物，也往往表现出更明显的降低水势。在水分限制条件下，相对根冠比在E+中呈下降趋势，而在E-中保持不变。重新灌溉后，一般恢复生长和水分状况变量进行了观察。提出了一个简单的解释，以协调我们的结果与以前的报告，但需要进一步的研究。
Endophyte-infected (E+) tall fescue plants are usually more persistent under water deficit than endophyte-free plants (E-). The reason for this is still unclear because of conflicting reports about growth and water status variables. A glasshouse experiment was carried out to compare morpho-physiological responses of E+ and E- tall fescue plants to water deficit during a cycle of water deprivation and recovery. Under non-limiting conditions total dry mass per container was higher in E+ plants than in E- plants. However, no differences were found between endophyte treatments in root:shoot ratio, water status or in reducing sugar content of leaf blades or tiller bases. Under water limiting conditions an accelerated response to water deficit was observed in E+ plants. The relatively steeper growth cessation as well as higher leaf and root senescence in E+ than in E- were linked with a higher accumulation of sugars within the stem base of E+ plants which also tended to show a more pronounced decrease in water potential. Under water limiting conditions relative root:shoot ratio tended to decrease in E+ while remaining unchanged in E-. Following re-irrigation, a general recovery in growth and water status variables was observed. A simple explanation is proposed to reconcile our results with previous reports, although further research is needed.