Photosynthesis of different plant organs in short-stem forms of winter rye

The intensity of photosynthesis in different organs of short-stem form of winter rye with dominant genetic control of this determinant was compared with the intensity of photosynthesis in original long-stem forms during the vegetative period. It was shown, that photosynthesis intensity in short-stem winter rye per unit of organ mass is decreased. However, in short-stem forms the range of organs in ontogenesis on degree of dioxide fixation is one of the most important factors for forming high corn productivity. The ear requirement needs for assimilates during the phase of milk ripeness in short-stem forms cause the adequate rise of photosynthesis intensity in upper and lower leaves, glumes and aristae; in long-stem forms the photosynthesis intensity is increased in two upper leaves and stem only. Consequently, the short-stem forms have a certain advantages at the forming of corn. Data obtained permit to increase the productivity of dominant short-stem forms of winter rye by the selective techniques.