Morphorogical and Physiological Studies on Nodule Formation in Soybeans : II Relations between the foliar application of carbohydrates and nodule formation

[摘要] In the previous paper, the author was led to conclude that the nodule formation in soybean plants was controlled by the level of the reducing sugar content in the host tissues by the results that a high nitrogen level in tissues or in soils on which the plants grew, had no effect on the penetration of Rhizobium japonicum into the roots and that the mere the roots contained nitrogen, the less they had sugars in their tissues. New experiments were carried out in order to prove the conclusion above mentioned by controlling artificially the sugar level of host tissues, the nitrogen content of which was very high, with foliar application of carbohydrates. Supplies of D-Glucose, D-Fructose, D-Xylose and Sucrose promoted the formation of nodules on the plants even when they were grown under rich nitrogen conditions (Table 1), or also when grown by sand culture deficient in nitrogen, the plants being actually rich in the element even in the latter case (Fig. 1). Of course, these sugars enough for giving such effects are usually contained in soybeans by nature.

[学科分类] 农业科学（综合）