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溶液培养条件下研究了番茄幼苗木质部和韧皮部汁液中氮及其它矿质养分运输对无机氮(NH4+-N、NO3--N)和氨基酸态氮(Gly-N)处理的不同响应。结果表明,不同氮素处理8d后,‘申粉918’和‘沪樱932’番茄木质部和韧皮部汁液中全氮含量表现为NH4+-N>Gly-N>NO3--N处理,而氮溢出量则以Gly-N处理的最多,其次为NH4+-N或NO3--N处理。两个品种木质部汁液中K、Ca、Mg以及‘沪樱932’木质部汁液中Cu含量表现为NO3--N>Gly-N>NH4+-N处理,而‘申粉918’中的Cu含量则表现为NO3--N>NH4+-N>Gly-N处理。两个品种木质部汁液中K、Ca、Mg、Cu、Zn、Mn溢出量均表现为NO3--N>Gly-N>NH4+-N处理;韧皮部汁液中K、Ca、Cu、Mn溢出量表现为Gly-N>NO3--N>NH4+-N处理;而其Mg、Zn溢出量则表现为NO3--N>Gly-N>NH4+-N处理,且‘沪樱932’的变化幅度较‘申粉918’的小。NH4+-N处理抑制番茄木质部养分向上运输的能力远大于Gly-N,‘申粉918’受抑制的程度更为明显。
The responses of nitrogen and other mineral nutrients in the xylem and phloem juice of tomato seedlings to inorganic nitrogen (NH4 + -N, NO3 - N) and amino acid nitrogen (Gly-N) treatment were studied under solution culture conditions. The results showed that the contents of total nitrogen in the xylem and phloem juice of ’Shenfen 918’ and ’Huying 932’ showed NH4 + -N> Gly-N> NO3 - N treatment with different nitrogen treatments for 8 days, Gly-N was the most treated, followed by NH4 + -N or NO3 - N treatment. The contents of Cu in K, Ca, Mg and xylem sauces of ’Hu Ying 932’ from two cultivars showed NO3 - N> Gly - N> NH4 + -N while the content of Cu in ’Shenfen 918’ NO3 - N> NH4 + -N> Gly-N. The spillover amounts of K, Ca, Mg, Cu, Zn and Mn in two varieties xylem showed NO3 - N> Gly - N> NH4 + -N. The spillover of K, Ca, Cu and Mn in phloem was Gly-N> NO3 - N> NH4 + -N, while the Mg and Zn spillovers showed NO3 - N> Gly-N> NH4 + -N treatment, Powder 918 ’small. The ability of NH4 + -N treatment to inhibit upward transport of nutrients in tomato xylem was much higher than that of Gly-N, and the inhibition of ’Shenfen 918’ was even more obvious.