Partitioning mycorrhizal influence on water relations of Phaseolus vulgaris into soil and plant components
Partitioning mycorrhizal influence on water relations of Phaseolus vulgaris into soil and plant components
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DOI：
10.1139/b04-020
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发表时间：
2004-04-01
期刊：
影响因子：
--
通讯作者：
Cho, KH
中科院分区：
文献类型：
--
作者：
Augé, RM;Sylvia, DM;Cho, KH
人们越来越认识到丛枝菌根对土壤性质的影响及其对植物行为的潜在影响。我们研究了菌根土壤可能直接影响植物水分关系的可能性。将野生型和非定植豆突变体种植到之前使用菌根或非菌根高粱植物产生的土壤中，我们将菌根对气孔导度和抗旱性的影响分为土壤和根部成分，测试菌根真菌的影响是否主要通过根部菌根化、土壤菌根化或两者兼而有之。突变本身对任何水关系参数没有影响。相对于大小相当的非菌根植物，Gigaspora margarita Gerdemann & Trappe 和 Glomus inradices Schenck & Smith 的定殖对致死点的叶水势和渗透压调节具有明显影响。菌根对抗旱性的影响归因于对植物本身的影响，而不是菌根土壤的影响。菌根对气孔导度的影响可归因于根和土壤的菌根化，以及仅根的菌根化。令人惊讶的是，仅在菌根土壤中生长就可以促进充足浇水和干旱植物中非菌根植物的气孔导度。菌根对干旱植物的影响似乎与土壤保水特性的改变无关，因为玛格丽塔大孢子菌和根内球霉仅轻微改变了土壤的水分特征曲线。
There is growing appreciation of arbuscular mycorrhizal effects on soil properties and their potential consequences on plant behavior. We examined the possibility that mycorrhizal soil may directly influence plant water relations. Using wild-type and noncolonizing bean mutants planted into soils previously produced using mycorrhizal or nonmycorrhizal sorghum plants, we partitioned mycorrhizal influence on stomatal conductance and drought resistance into soil and root components, testing whether effects of mycorrhizal fungi occurred mostly via mycorrhization of roots, mycorrhization of soil, or both. The mutation itself had no effect on any water relations parameter. Colonization by Gigaspora margarita Gerdemann & Trappe and Glomus intraradices Schenck & Smith had appreciable effects on leaf water potential at the lethal point and on osmotic adjustment, relative to nonmycorrhizal plants of comparable size. Mycorrhizal effects on drought resistance were attributable to an effect on the plant itself rather than to an effect of mycorrhizal soil. Mycorrhizal effects on stomatal conductance were attributable to mycorrhization of both roots and soil, as well as to mycorrhization of roots alone. Surprisingly, merely growing in a mycorrhizal soil resulted in promotion of stomatal conductance of nonmycorrhizal plants in both amply watered and droughted plants. Mycorrhizal effects on droughted plants did not appear to be related to altered soil water retention properties, as Gigaspora margarita and Glomus intraradices altered the soil's moisture characteristic curve only slightly.