Hetrick B A Dantels, Kitt D Gerschefske, Wiilson G Thompson
Department of Plant Pathology, Kansas State University, Manhattan, KS 66506, USA.
New Phytol. 1987 Mar;105(3):403-410. doi: 10.1111/j.1469-8137.1987.tb00877.x.
The responses of mycorrhizal corn (Zea mays L.), sudan grass [Sorghum vulgare (Piper) Hitch.], and big bluestem (Andropogon gerardii Vitman) under drought stress were compared. Although growth of each of the plant species benefited from the mycorrhizal fungus under adequately watered conditions, inoculation had no effect on the growth of corn or sudan grass when cyclic drought stress was imposed on these plants. In contrast, growth of mycorrhizal big bluestem was significantly greater than non-mycorrhizal big bluestem, even under severe drought stress. Drought-stressed mycorrhizal plants without phosphorus amendment were not larger than drought-stressed, non-inoculated, fertilized (15 mg kg p) plants, suggesting no increased drought tolerance. The ability of Glomus etunicatum Becker & Hall to benefit plant growth under drought stress was apparently plant-mediated and possibly related to the dependency of the plant on this mycorrhizal fungus. Under adequately watered conditions, inoculated corn and sudan grass were respectively 1.23 and 1.13 times larger than non-inoculated plants, while inoculated big bluestem was 6.56-fold larger than non-inoculated control plants.
比较了菌根玉米（Zea mays L.）、苏丹草[Sorghum vulgare (Piper) Hitch.]和大须芒草（Andropogon gerardii Vitman）在干旱胁迫下的反应。虽然在水分充足的条件下，每种植物的生长都受益于菌根真菌，但当对这些植物施加周期性干旱胁迫时，接种对玉米或苏丹草的生长没有影响。相比之下，即使在严重干旱胁迫下，菌根大须芒草的生长也显著大于非菌根大须芒草。未添加磷的干旱胁迫菌根植物并不比干旱胁迫、未接种、施肥（15毫克/千克磷）的植物大，这表明耐旱性没有提高。埃氏球囊霉（Glomus etunicatum Becker & Hall）在干旱胁迫下促进植物生长的能力显然是由植物介导的，可能与植物对这种菌根真菌的依赖性有关。在水分充足的条件下，接种的玉米和苏丹草分别比未接种的植物大1.23倍和1.13倍，而接种的大须芒草比未接种的对照植物大6.56倍。
