Studies on the Stiffness of Culms in Barley Plants (Hordeum sativum, JESSEN) : 11. Physiological studies on the stiffness of culms by 14C tracer method (1).

[摘要] A brittle culm variety, Sekitorisai-No. 1, and a stiff culm variety, Haganemugi (Hordeum sativum, JESSEN) were used. After 14C application to plants in early heading stages, 14C-translocation was studied till maturing stage. Total 14C assimilated products of both varieties were regarded as Haganemugi » Sekitorisai-No. 1, and total 14C consumption by respiration as Haganemugi » Sekitorisai-No. 1. So it is considered that photosynthetic activity and respiration ability are larger in Haganemugi than in Sekitorisai-No. 1. Distribution of 14C among the entire plant was also determined. The distribution ratio of 14C was regarded in Sekitorisai-No. 1 as follows; leaves » leaf sheaths > culms. The ratio in Haganemugi was regarded as leaves » culms > leaf sheaths, and besides a great difference of distribution state was regarded in culms of both varieties. On the total 14C of culms, the stiff culm variety was larger than the brittle culm variety. The metabolic activity of each organ tissue was estimated as Haganemugi > Sekitorisai-No. 1. On the assimilation of 14C and translocation of 14C, the differences were regarded in the both varieties. Namely, assimilated 14C contributed to the storage substances production in Sekitorisai-No. 1, and on the other hand, assimilated 14C was used for both of storage substance production and organ tissue constitution. It is considered that such a great difference of physiological characters between both varieties has close contacts with the culm strength of them.

[学科分类] 农业科学（综合）