日本作物学会紀事
Online ISSN : 1349-0990
Print ISSN : 0011-1848
ISSN-L : 0011-1848
水稲の出穂期前後に於ける風雨害に関する研究
第8~10報 風害稲の栄養生理障害について
志茂山 貞二
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ジャーナル フリー

1959 年 27 巻 2 号 p. 163-167

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With the object of throwing more light on the mechanism of deterioration of fertility of wind-damaged rice plant, a series of experiments were conducted in which potted rice plants of various stages (during 20∼30 days before and after heading) were treated with wind (15.5m/sec. hr.), and their nutritional status after treatment were examined. The following conclusions are drawn from this study. 1) Water absorption of wind-damaged rice plant increased with the rapid increase of transpiration rate ; however, as a whole, water economy of the plant was in unbalance, and leaf-withering occured, moreover, differentiation and development of growing region and panicle came to be retar ded. 2) The occurrence of leaf-withering not only cheked the transpiration rate, but also decreased water absorption by and through root, as a result, the physiological function of root degraded the absorption of solutes, their translocation, accumulation and metabolic activity were retarded. 3) The increased leaf-withering and the reduction of capillary and constitutional water hindered carbon assimilation ability, while increased respiration rate resulted the accelerated consumption of assimilated products; this, in turn, caused further nutritional deficiency. To sum up, it is concluded that the traditional views "that the deterioration of fertility of wind-damaged rice plant is to be attributed to a direct injury by wind or storm", lacks experimental bases. On the other hand, it now seems a reality that the deterioration of fertility of wind-damaged rice plant is caused by subsequent nutritional disturbance. This is especially accountable for the fact that damages of rice plant after the Earforming stage are markedly severe.
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