MYCORRHIZA AND REPEATED DROUGHT EXPOSURE AFFECT DROUGHT RESISTANCE AND EXTRARADICAL HYPHAE DEVELOPMENT OF PEPPER PLANTS INDEPENDENT OF PLANT SIZE AND NUTRIENT CONTENT
MYCORRHIZA AND REPEATED DROUGHT EXPOSURE AFFECT DROUGHT RESISTANCE AND EXTRARADICAL HYPHAE DEVELOPMENT OF PEPPER PLANTS INDEPENDENT OF PLANT SIZE AND NUTRIENT CONTENT
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DOI：
10.1016/s0176-1617(11)80339-1
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发表时间：
1992-01-01
影响因子：
4.3
通讯作者：
LINDERMAN, RG
中科院分区：
文献类型：
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作者：
DAVIES, FT;POTTER, JR;LINDERMAN, RG
有va -菌根（由真菌Glomus deserticola Trappe， blloss & Menge形成）、VAM和NVAM的辣椒植株分别通过4个干旱周期进行干旱驯化（DA）或保持水分充足（NDA）。然后，所有的植物都经历了一个额外的干旱周期。在所有处理中，nam比VAM施用更多的磷肥获得了相似的茎质量和叶面积。除少数例外，NVAM植株叶片中包括磷在内的12种元素的养分浓度均等于或高于VAM植株。在干旱胁迫高峰期，VAM-DA组合处理的植株抗旱性最强，表现为叶片水势、膨松度、相对含水量和未枯萎植株出现频率最高。单独施用VAM或DA时，有一定的抗旱性，如萎蔫的中等频率所示。营养和植株大小与这种抗旱性无关。干旱驯化增强了VAM植株的根外菌丝发育和土壤聚集，表明这些菌丝通过促进土壤水分吸收来提高抗旱性。
Pepper (Capsicum annuum L.) plants with and without VA-mycorrhiza (formed by the fungus Glomus deserticola Trappe, Bloss & Menge), VAM, and NVAM, respectively, were drought acclimated (DA) by four drought cycles or kept well watered (NDA). All plants were then subjected to an additional drought cycle. Similar shoot mass and leaf area were achieved in all treatments by giving more P fertilizer to NVAM than VAM plants. With few exceptions, leaf nutrient concentrations of 12 elements, including P, were either equal or higher in NVAM than VAM plants. During peak drought stress, plants with the combination of VAM-DA treatments had the greatest drought resistance, as indicated by the highest leaf water potential, turgor, relative water content and frequency of non-wilted plants. Some drought resistance, as indicated by intermediate frequency of wilting, occurred when VAM or DA were applied singly. Nutrition and plant size were not associated with this drought resistance. Extraradical hyphae development and soil aggregation of VAM plants were enhanced by drought acclimation, suggesting that these hyphae improved drought resistance by facilitating soil water uptake.