磷酸盐与硒酸盐相互作用对小白菜磷和硒吸收的影响

赵文龙; 梁东丽; 石 美; 胡 斌; 肖 然; 王嘉薇

Effects of Phosphate and Selenate Interactions on Uptake of Phosphorus and Selenium by Pak Choi

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KeyWord:phosphate; selenate; growth; uptake

Author Name	Affiliation
ZHAO Wen-long	College of Natural Resources and Environment，Northwest A&F University；Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China，Ministry of Agriculture，Yangling 712100，China
LIANG Dong-li	College of Natural Resources and Environment，Northwest A&F University；Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China，Ministry of Agriculture，Yangling 712100，China
SHI Mei	College of Natural Resources and Environment，Northwest A&F University；Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China，Ministry of Agriculture，Yangling 712100，China
HU Bin	College of Natural Resources and Environment，Northwest A&F University；Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China，Ministry of Agriculture，Yangling 712100，China
XIAO Ran	College of Natural Resources and Environment，Northwest A&F University；Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China，Ministry of Agriculture，Yangling 712100，China
WANG Jia-wei	College of Natural Resources and Environment，Northwest A&F University；Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China，Ministry of Agriculture，Yangling 712100，China

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Abstract:

Phosphate may influence movement and uptake of selenium in soil-plant systems. A pot experiment was carried out to study the effects of phosphate and selenate interactions on growth，uptake of phosphorus and selenium of pak choi. Addition of selenate alone significantly reduced the root length，shoot height and dry weight of shoots and roots，and also caused the decline of Chlorophyll Meter Readngs（SPAD values） at higher doses. Supplying phosphate increased the pak choi biomass，but significantly reduced concentrations of selenium in both roots and shoots due to the biological dilution. However，selenium accumulation by pak choi was increased by phosphate applications. Applying phosphate increased the average selenium use efficiency by up to 42% at all selenate rates（1.0~5.0 mg·kg-1），with higher selenium use efficiency in low than in high phosphate treatments. Applying selenate had no effects on phosphorus concentrations of pak choi，while reduced phosphorus accumulation by pak choi due to the selenium toxicity.