Effect of increased nitrate content in the nutrient medium on the quantity of photosynthetic pigments in pea plants and on their degragation in case their leaves are in the dark
1992
Tsoneva, P. (Sofijski Universitet "Sv. Kliment Okhridski", Biologichen Fakultet, Sofia (Bulgaria))
Pea plants cv. Ran-1 were grown as hydroponics in Knopp's solution with 2, 4, 6 and 10 times increased nitrate content as compared to the control. After 2 weeks the plants accumulated NO3- in their leaves in accordance with the growing concentrations in the nutritient medium. As a result of that their protein and pigment content was increased. Notwithstanding that, when the leaves were in dark in a humid chamber of a thermostat at temperature 25 C for 3-4 days a faster ageing of the photosynthetic apparatus was observed which consisted in greater degradation of the pigments and activization of chlorophyllase in "nitrate" levels. Nitrate salinity had a particularly negative effect on chlorophyll b, its quality during plant growth was reduced and that was more pronounced in case the leaves were in the dark.
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