Studies on Nitrogen Metabolism in Crop Plant : II. Effect of kinetin on nitrogen metabolism in detached leaves of rice plant and italian ryegrass.

[摘要] The results obtained may be summarized as follows; 1. A rapid decline in levels of protein and RNA in detached rice leaves was highly suppressed by kinetin of 2-20ppm, and these concentrations of kinetin (1-50ppm) inhibited the rooting largely. On the other hand, lower concentrations of kinetin (0.01-0.1ppm) promoted the rooting of such plants in spite of no effectiveness to the protein level of detached leaves. 2. As regard to the relation of the nitrogen compounds between blade and sheath in the detached italian ryegrass leaves, it was showed that protein and RNA breakdown occurred in leaf blade, and concomitantly, increased soluble-N translocated and accumulated in leaf sheath. However, in kinetin treated leaves, it was showed that levels of protein and RNA were highly maintained in leaf blade, and accordingly, content of soluble-N was very lower in both organs of leaf blade and sheath. 3. Especially, high ratio of RNA to DNA was maintained in kinetin treated leaves. and these results were close agreed with the data given by Osborne. It is suggested that kinetin, by maintaining RNA level, thus maintains protein synthesis which is essential for the survival of the the detached leaves.

[学科分类] 农业科学（综合）