論文の公開元へ山形県朝日町のミツバアケビ栽培系統間における交雑（不）和合性
概要
Three-leaf akebia (Akebia trifoliata (Thunb.) Koidz.) is a local fruit tree, mainly cultivated in Yamagata Prefecture. Akebia species is known to exhibit late-acting self-incompatibility. Pollination with cross-compatible lines is recommended to facilitate stable fruit production. The genetic mechanism of self-incompatibility in Akebia has not been uncovered. Furthermore, cross-(in)compatibility among the cultivated akebia local lines has not been reported. In the present study, we investigated the cross-(in)compatibility relationship among 6 three-leaf akebia local lines in the Asahi-machi Region of Yamagata Prefecture, namely Shuuka, Pack, Yoshi-2, Kouoku, Fujimurasaki, and Hatsuhime. Almost all self-pollinated pistils of these lines abscised during 2–4 weeks after pollination, and the pollinated pistils in several crosses also completely abscised at the same time as selfed pistils. Based on the fruit set at six weeks after pollination and the pattern of pistil/fruit-abscission, the cross-(in)compatibility among six lines was estimated. Most crosses were found to be compatible, whereas, some crosses, especially with Kouoku, were incompatible. The reciprocal cross between Kouoku and Hatsuhime yielded inconsistent results, and the cross between Yoshi-2 and Fujimurasaki, both of which were incompatible with Kouoku, was compatible. These results indicate the possibility that self-incompatibility in three-leaf akebia might be not under simple gametophytic control.
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