On the Relation between the Existence of Wheat Anthers and the Infection of Gibberella zeae (Schw.), Petch.

[摘要] The fact that the incipient infection by head blight of wheat spikelet takes place through anther corpses kept by glumes of a flower was proved by many other authers. The auther examined several wheat varieties for the phenomenon of coming out of the anthers from the flower in 1956, and found the varietal differences in this phenomerion as follows: (Group A) Varieties, most flowers of which caught anthers between the tips of the closing glumes, (for example, Norin No.4). (Group B) Varieties, most flowers of which kept anthers inside of the closing glumes, (for example, Ejimashinriki). (Group C) Varieties, most flowers of which pushed anthers out of the flowers and held little anther corpses inside (for example, Norin No. 29). (Group D) Varieties, some flowers of which had anthers caught by glumes and some ones had anthers kept inside of closing glumes, (for example, Norin No. 26). The mechanisms of retention of the anthers by floret were studied and the following results were obtained. (1) The retention of the anthers in the group A was caused by the filaments of anthers which were too short to extrude them out of the glumes. (2) The retention of the anthers in the group B was caused by the entrapping of the anthers behind the folded margin of the palea. (3) The escape of anthers from the glumes in the group C was ensured, since the length of filaments was long enough for the escape of anthers from the glumes and palea did not entrap the anthers by its folded margin. The anther corpses kept inside the floret by glumes such as in the group B were pushed up by the growing grains, and finally a part of the anther corpses appeared from the opening between the glumes. In this stage, these varieties tend to develop more blight infection than in the earlier stage, because blight attacks more easily through the exposed part of anther corpses.

[学科分类] 农业科学（综合）