Influence of the Various Parts of the Photosynthetic Organs of Wheat and Barley in producing Grains During the Ripening Period. (II)

Abstract

Experiments were carried out in 1958 on Wheat and barley grown in field and pot culture, to ascertain the amount of contributions, indebted to the activities of several photosynthetic organs as well as to the reserve material contained in them, for the ripening of grains. The amount of contribution was estimated indirectly by the decrease caused by defoliation or shading of the ears, leaves and stems, and measuring the resulted weight of grains and plant parts. The results of both experiments were summarized in table 4. The leaf-blade of wheat contributed about 37 %, the stem with sheath 31 % and the ear itself 21 %, while about 12 % was supplied from reserve materials. In case of barley the leaf blade contributed 27 %, the stem 42 % and the ear 23 %, while 9 % was from the reserve. It was also recongnized that in wheat greater proportion of the total assimilation product of leaves was attributable than in barley. The translocation of reserve material and contribution of ear assimilation showed slight differnce between wheat and barley.