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首页> 外文期刊>日本作物學會紀事 >Relationships between Environmental Conditions and Production-and Consumption Activities of Individual Leaves in the Population of Rice Plant in a Paddy Field : III. Effects of shading on photosynthesis and dark respiration of individual leaf of different position
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Relationships between Environmental Conditions and Production-and Consumption Activities of Individual Leaves in the Population of Rice Plant in a Paddy Field : III. Effects of shading on photosynthesis and dark respiration of individual leaf of different position

机译：稻田中水稻植物人口环境条件与消费活动的关系：III。阴影对不同位置单个叶片光合作用和暗呼吸的影响

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摘要

Changes of photosynthetic and respiration rates of leaves of different position under full light and shading conditions and of their recovery processes from shading to full light were investigated. 1. The photosynthesis under shading (about 95% shaded; maximum light intensity under shading was about 6 klx) was about 20% of that under full light, and the ratio of photosynthetic rate under shading to full light condition was higher at the low leaf than at the upper or middle leaf, and it declined in all leaves with time of treatment. 2. There was no remarkable after-effect of shading when plants were shaded one or two days and then transferred to full light, but 3 or 5 days' shading retarded the recovery and such a retardation was marked in the low leaf. 3. Respiration rates decreased by shading. The ratios of respiration rate to photosynthetic rate were 8-12% under full light, being larger as the leaf position was lowered, and they were about 26-33% and 36-40% at the upper leaves and the lower leaf, respectively, under shading. In general, respiration rate changed in parallel with the change of photosyntlletic rate under full light condition, and also under shading although to a smaller extent. Even the lowest leaf may not be "parasitic".
机译：研究了在全光线和遮蔽条件下不同位置的光合作用和呼吸速率的变化，以及从阴影到全光的恢复过程。 1.阴影下的光合作用（约95％阴影;阴影下的最大光强度约为6 kLx）约为20％，在全光下，阴影下的光合速率与全光状况的比率较高，在低叶上较高而不是在上叶或中叶，并且在所有叶子中均下降，随着治疗的时间。 2.当植物被遮蔽一两天时没有显着的遮蔽后效果，然后转移到全光线，但是3或5天'遮蔽延迟回收并在低叶中标记如此延迟。 3.呼吸率通过阴影降低。在全光下，呼吸率与光合速率的比率为8-12％，随着叶子位置降低而较大，分别在上叶和下叶中的约26-33％和36-40％，在阴影下。通常，呼吸率随着全灯条件下的光学速率的变化而变化，并且在阴凉处也较小。即使是最低的叶子也可能不是“寄生”。

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