Effect of Arbuscular Mycorrhizal Fungi (AMF) on Growth of Orchardgrass

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  • アーバスキュラー菌根の形成がオーチャードグラスの生育に及ぼす影響
  • アーバスキュラーキン コン ノ ケイセイ ガ オーチャードグラス ノ セイイク ニ オヨボス エイキョウ

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Abstract

Our prior studies indicated that Glomus clarum (Gl. clarum) had a growth inhibitory effect on orchardgrass (Dactylis glomerata L. : Akimidori). In this pot experiment, we examined the growth inhibitory effect using Akimidori and four other varieties (Natsumidori, Wasemidori, Aonami, Kitamidori) inoculated with Gl. clarum. In addition, we investigated the number and proportion of the arbuscules which showed alkaline phosphatase (ALPase) activity in the mycorrhizal roots. 1) After cultivation for 84 d, in both winter and summer tests, a growth inhibitory effect was observed in Akimidori and Natsumidori in both seasons, and a growth promoting effect was observed in Aonami and Kitamidori in both seasons. 2) The number and proportion of the arbuscules which showed ALPase activity tended to be lower in the varieties with the growth promoting effect than in the varieties with the growth inhibitory effect. From the above fact, the phenomenon that Gl. clarum had a growth inhibitory effect was not universally found for species of orchardgrass. It was indicated that the effect differed depending on the variety. The growth inhibitory effect was considered to be caused by the number and proportion of the arbuscules which showed ALPase activity in the host plant roots.

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