ヤエムグラ種子の休眠覚醒作用に関する研究 : 第1報種子の組織学的ならびに生理学的変化

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The development of the dormancy breaking chemical substances that should be able to control weeds simultaneously is significant to research reasonable weed control methods. In this present paper, as a link of studies on the termination of dormancy in cleaver (Galium aparine L.) seeds and for the development of the dormancy breaking substances, the role of seed coats of dormancy seeds, and the histological and physiological changes during the process to termination of dormancy have been investigated. 1) According to the histological observation during dormancy, the cleaver seed coat is of thin and plane figure, and yet the endosperm cells are constituted with thick cell walls and arranged irregularly. The embryo is embedded in the schizogenous intercellular space in the center of the endosperm. And then on germination, the embryo elongates throughout the new schizogenous intercellular space in the endosperm at the top of the embryo. 2) Some physical and chemically resolving treatments are not able to break the dormancy in cleaver seeds, and, in the dry seeds, the phenomenon of inhibition water absorption cannot be observed. It is evident that the dormancy in cleaver seeds should not be originated in hard seed coat as well as Milk vetch (Astragalus sinicus L.) seeds. 3) The water absorption rate of cleaver seeds does not change in the process to the termination of dormancy (30℃ incubation), but the respiration activity (O_2-uptake) is decreased remarkably. Moreover, when the seeds are incubated in the optimum temperature for germination (10℃ incubation) the histological aspects of the incubated seeds are much similar to those of dormancy seeds and the elongation of the embryo tissue can not be observed till the seeds germinate. During the period, the respiration of seeds, however, is activated and the oxgen uptake rises gradually. On the contrary, the hardness of seeds are reduced in a high degree. These results signify that the action of dormancy breaking in cleaver seeds should be promoted by two temperature steps, that is at first by 30℃ and at last by 10℃.
日本雑草学会の論文
1967-12-25

ヤエムグラ種子の休眠覚醒作用に関する研究 : 第1報種子の組織学的ならびに生理学的変化

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