Relationship between Nitrate Contents of Chinese Cabbage (Brassica chinensis L.) and Light Intensity or Key Enzymes of Nitrogen Metabolism

doi:10.7506/spkx1002-6630-201613033

Abstract

Abstract:

Pot experiment was carried to explore the relationships of nitrate contents with photosynthetic system parameters
in two Chinese cabbage varieties (Brassica chinensis L.) (the low-nitrate variety ‘JN4’ and the high-nitrate variety ‘HKTX’)
under different light intensities (3 000, 6 000 and 12 000 lx) as well as with the key enzymes of nitrogen metabolism in
soil and plants. The results showed that the biomass of Chinese cabbage had an increasing trend with increasing light
intensity. The dry weight of shoots of ‘HKTX’ and ‘JN4’ increased by 10.51%?28.09% under light intensities of 6 000 and
12 000 lx as compared with that under 3 000 lx. The nitrate contents in leaves of the two Chinese cabbage varieties decreased
significantly with increasing light intensity. The nitrate contents in leaf blades and petioles of ‘HKTX’ and ‘JN4’ decreased
respectively by 22.27%?43.32% and 8.21%?31.40% under 6 000 and 12 000 lx as compared with those under 3 000 lx.
There were significantly negative correlations between nitrate content and either net photosynthetic rate (Pn) with correlation
coefficients of −0.686 and −0.833 (P < 0.01) or nitrate reductase (NR) activity in leave blades with correlation coefficients
of −0.719 and −0.696 (P < 0.05) for the varieties ‘HKTX’ and ‘JN4’, respectively. Significantly positive correlations existed
between the content of nitrate in either leaf blades or petioles and NO3^--N level in soil with correlation coefficients of 0.692,
0.726, 0.676 and 0.796 for ‘JN4’ and ‘HKTX’ (P < 0.05), respectively. Moreover, significantly negative correlations were
observed between soil NO3^--N content and nitrate reductase activity with correlation coefficients of −0.826 and −0.832
(P < 0.01), respectively.

Key words: nitrate content, light intensity, key enzymes of nitrogen metabolism, correlation, Chinese cabbage varieties

CLC Number:

CHEN Yongqin, FENG Bo, XU Weihong, YANG Yun, CHI Sunlin, CHEN Xugen, WANG Zhengyin, XIE Deti. Relationship between Nitrate Contents of Chinese Cabbage (Brassica chinensis L.) and Light Intensity or Key Enzymes of Nitrogen Metabolism[J]. FOOD SCIENCE, doi: 10.7506/spkx1002-6630-201613033.

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