Impact of sulfate nutrition on the utilization of atmospheric SO2 as sulfur source for Chinese cabbage

文献类型： 外文期刊

第一作者： Yang, Liping

作者： Yang, Liping;Stulen, Ineke;De Kok, Luit J.

作者机构：

关键词： Brassica pekinensis;Chinese cabbage;nitrate uptake;shoot-to-root ratio;sulfur deficiency;sulfur dioxide;sulfate uptake;BRASSICA-OLERACEA;H2S;METABOLISM;ROOTS;DEFICIENCY;DEPOSITION;EFFICIENCY;NITROGEN;EXPOSURE;SPINACH

期刊名称：JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE-ZEITSCHRIFT FUR PFLANZENERNAHRUNG UND BODENKUNDE （ 影响因子：1.595； 五年影响因子：1.766 ）

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收录情况： SCI

摘要： The ability of Chinese cabbage (Brassica pekinensis) to utilize atmospheric sulfur dioxide (SO2) as sulfur (S) source for growth was investigated in relation to root sulfate (SO42-) nutrition. If seedlings of Chinese cabbage were transferred to a sulfate-deprived nutrient solution directly after germination, plants became rapidly S-deficient. Plant-biomass production was decreased and the shoot-to-root ratio decreased. Sulfate deprivation resulted in a substantial decrease in total S, sulfate, organic-S, and water-soluble nonprotein thiol contents and in an increase in amino-acid content of both shoot and root. The sulfate-uptake rate of the root was strongly increased, whereas nitrate-uptake rate was decreased. Upon resupply of sulfate, the onset of S-deficiency symptoms was prevented, and growth was restored, whereas sulfate and nitrate-uptake rates were quite similar to those of the sulfate-sufficient plants. A 6-day exposure to 0.12 mu L L-1 SO2 Of Sulfate-sufficient plants did not affect plant-biomass production, shoot-to-root ratio, S and nitrogen (N) compounds of shoot and root, or sulfate and nitrate uptake by the root. Exposure of sulfate-deprived plants to SO2 resulted in enhanced total S, organic-S, and water-soluble nonprotein thiol contents of the shoot. The contribution of SO2 as S source for biomass production depended on the duration of the sulfate deprivation. If Chinese cabbage was transferred to a sulfate-deprived nutrient solution and simultaneously exposed to SO2, then plants benefited optimally from the foliarly absorbed S. The development of S-deficiency symptoms was prevented, and shoot-biomass production was quite similar to that of sulfate-sufficient plants. However, upon SO2 exposure root-biomass production was even higher than that of sulfate-sufficient plants, whereas sulfate uptake was still enhanced. Evidently, upon SO2 exposure there was no strict and direct shoot-to-root signaling in tuning sulfate uptake by the root and its transport to the shoot to the need for growth, via down-regulation of sulfate uptake and normalizing shoot-to-root biomass partitioning.

分类号： S1

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