Photosynthesis, assimilates transport and productivity in potato plants of the Nevskii variety grown under different insolation

The authors investigated the effect of 25, 50 и 95 % insolation on 14CO2 assimilation and the distribution of photosynthetic 14C-products in potato plant's organs. It was shown, that carboxylating activity in leaves (14СО2 absorption) was increased only in the conditions of 95 % insolation, but under 25 и 50 % insolation the significant differences were not revealed. The intensity of labeled assimilate export from the 14С-donor lamina was maximal during medium lighting and minimal - during saturated one. The 14С distribution in plant organs in the conditions of high-level lighting was characterized by rise of assimilates transport to crown of stem and by reduced entry of 14С to tubers. The efficiency of photosynthetic apparatus (the mass of tubers per mass unit of potato tops) in 50 and 95 % variants was the greatest and the least, respectively.