Online citations, reference lists, and bibliographies.
Please confirm you are human
(Sign Up for free to never see this)
← Back to Search

Photochemistry And Gas Exchange In Cold Conditions In Zn-deficient Red Cabbage (Brassica Oleracea L. Var. Capitata F. Rubra) Plants

Roghieh Hajiboland, Fahimeh Amirazad

Save to my Library
Download PDF
Analyze on Scholarcy
Photochemistry and gas exchange in cold conditions in Zn-deficient red cabbage (Brassica oleraceaL. var.capitataf.rubra) plantsThe responses of red cabbage (Brassica oleraceaL. var.capitataf.rubra) plants to a low Zn supply and cold conditions (10°/7°C day/night temperature) were investigated in a hydroponic growing medium. A low Zn supply caused a significant reduction of shoot and root dry weight - up to 55% and 45% for the control and 62% and 52% for cold-treated plants, respectively. The total soluble carbohydrates and starch declined in Zn-deficient plants. Exposure to low temperatures, however, led to a decline in starch but an increase in soluble sugars. In Zn-sufficient plants, low temperatures increased the excitation capture efficiency of open photosystem II (PS II) reaction centres (RCs) (F'v/F'm), the quantum yield of PS II (ΦPSII), the electron transport rate (ETR) and the proportion of active chlorophyll associated with the RCs of PS II (Fv/F0). Low temperatures did not affect net CO2uptake in Zn-sufficient plants, though a reduction of stomatal conductance occurred. The results demonstrated that although cold-treated plants were slightly more susceptible to Zn deficiency, cold treatment caused greater shoot biomass (up to 32%) in plants supplied with adequate Zn. The adaptation of red cabbage plants to cold conditions is attributable to improved photochemical events in the leaves, a maintenance of the net CO2assimilation rate, lower water loss and the accumulation of anthocyanins as antioxidants.