The effect of NO3 −:NH4 + ratio (14:1, 9:6, 7.5:7.5, 1:14, total 15 mmol/L N) in the nutrient solution on biomass, root morphology, and C and N metabolism parameter in hydroponically grown oilseed rape (Brassica napus L.) was evaluated. The dry weights of leaves and roots were significantly largest at the equal NO3 −:NH4 + ratio (7.5:7.5) compared with those of high NO3 −:NH4 + ratio (14:1) or low NO3 −:NH4 + ratio (1:14). Additionally, low NO3 −:NH4 + ratio (1:14) reduced total root length and root surface area compared with the equal NO3 −:NH4 + ratio (7.5:7.5), while high NO3 −:NH4 + ratio (14:1) did not show any significant effect on root morphology except average diameter. The maximum of chlorophyll a, chlorophyll b and carotenoid were obtained under 7.5:7.5 treatment, whereas the maximum of the leaf net photosynthetic (P n), stomatal conductance (G s) and transpiration rate (T r) were increased with increase in NH4 + concentration in the nutrient solution. The activity of nitrate reductase (NR) showed a significant difference at different NO3 −:NH4 + ratios and ranged 9:6 > 7.5:7.5 > 14:1 > 1:14, whereas the range of soluble sugar and soluble protein was 7.5:7.5 > 1:14 > 9:6 > 14:1. Our study reveals that oilseed rape growth is greater under 7.5:7.5 treatment than that under three other treatments. Oilseed rape growth at high or low NO3 −:NH4 + ratios was inhibited by decreased pigments, NR activity, soluble sugar, and soluble protein, whereas subdued root growth should be apprehended considerate under high NH4 + condition.
Acta Physiologiae Plantarum – Springer Journals
Published: Aug 7, 2017
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