CHANGES IN PHYSIOLOGICAL-ACTIVITY OF ASSI MILATIVE TISSUE IN CONDITIONS OF LONG-CONTINUED PHOTOSYNTHESIS

Plant physiological processes - rates of photosynthesis (P(N)), respir ation (R(D)), Hill reaction activity (AHR) were measured in laboratory , field and greenhouse conditions. On the basis of measurements the ph otosynthetic capacity of leaf tissues was characterized. The results o btained proved that photosynthetic activity is high and assume active dry matter accummulation up to 45 % of weight during 28 hours of conti nual lighting and segments exposition. The dry matter accummulation is shown by changes in nitrogen concentrations. The dry matter increase without transport of assimilates modified relations between photosynth esis rate (P(N)), respiration (R(D)) as well as relations between horm onal substances either stimulative or inhibitory type.