Studies on the differences of physiological and ecological characteristics of the artificially raised amphidiploid in comparison with those of the parents : 〔1〕 On the drought resistance

[摘要] Studies were made on the drought resistance of "Nori-Asa" (glutinous-hemp), an amphidiploid crop raised between Abel. esculentus and Abel. Manihot, in comparison with those of its parents. The number of Stomata per 1 mm2 was the most in Manihot, and that in "Nori-Asa" was similar to that in Manihot. The concentration of cell sap and the resistance to KClO3 were the highest and the strongest respectively in Manihot, medium in esculentns, and the least in "Nori-Asa." The water content was the lowest in Manihot, medium in "Nori-Asa" and the higest in esculentus. The wilting speed was the slowest in Manihot, and that in "Nori-Asa" was similar to, that in esculentus. The amount of transpiration was the largest in Manihot, medium in esculentus, and the the smallest in "Nori-Asa" Thus, the cause of the facts that the drought resistance of the "Nori-Asa" was weeker than that of the parents in the practical cultivation was clarified from various physiological experiments. The degree of the drought resistance of "Nori-Asa" resembled that of one parent which had the larger number of chromosomes than that of the other parent.

[学科分类] 农业科学（综合）