| 番茄根系分泌物、木质部和韧皮部汁液组分对矿质氮、有机氮营养的响应 |
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| 引用本文： | 葛体达,唐东梅,芦 波,夏含嫣,宋世威,黄丹枫.番茄根系分泌物、木质部和韧皮部汁液组分对矿质氮、有机氮营养的响应[J].园艺学报,2008,35(1):39-46. |
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| 作者姓名： | 葛体达 唐东梅 芦 波 夏含嫣 宋世威 黄丹枫 |
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| 作者单位： | （上海交通大学农业与生物学院，上海 201101；东北农业大学园艺学院，哈尔滨 150030） |
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| 摘 要： | 采用营养液培探讨了番茄幼苗根系参数、根系分泌物、木质部和韧皮部汁液组分对矿质氮（NH4+-N、NO3--N）和有机氮（Glycine）的不同响应。结果表明，不同氮素处理8 d后，'申粉918'、'沪樱932'番茄根系干质量、根系体积表现为NO3--N > Gly-N > 对照 > NH4+-N处理；而根系活力则表现为以供Gly-N 或NO3--N为最高，其次为供NH4+-N的处理，以对照处理为最低。不同氮素形态显著影响不同番茄品种根系分泌物、木质部和韧皮部各组分含量。 NO3--N处理的番茄根系分泌物、木质部和韧皮部汁液中的NO3--N和P含量最高，供Gly-N、NH4+-N其次，对照最低；而供Gly-N、NH4+-N时铵态氮、游离氨基酸、可溶性糖含量一般均高于处理NO3--N和对照。番茄根际吸收不同氮素对根际pH亦产生不同的影响，吸收NO3--N和Gly-N后，根际pH显著升高，而吸收NH4+-N后则降低。根系分泌物可溶性蛋白含量的变化表现为NO3--N > Gly-N > NH4+-N> 对照，而木质部、韧皮部可溶性蛋白含量的变化则表现为Gly-N > NO3--N> NH4+-N > 对照。番茄幼苗不同品种间的差异性表现，与氮素形态有关，以根系活力为指标的基因型差异在供应NO3--N、NH4+-N和Gly-N及对照时，'沪樱932' 的根系活力均显著（P<0.05）大于 '申粉918'。
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| 关 键 词： | 番茄 矿质氮 有机氮 根系分泌物 木质部汁液 韧皮部汁液 |
| 收稿时间： | 2007-6-29 |
| 修稿时间： | 2007-9-6 |
Influence of Organic and Inorganic Nitrogen Supply on the Composition of Tomato Seedling Root Exudates, Xylem and Phloem Sap Grown in Hydroponic Culture |
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| GE Ti-da,TANG Dong-mei,LU Bo,XIA Han -yan,SONG Shi-wei,HUANG Dan-feng.Influence of Organic and Inorganic Nitrogen Supply on the Composition of Tomato Seedling Root Exudates, Xylem and Phloem Sap Grown in Hydroponic Culture[J].Acta Horticulturae Sinica,2008,35(1):39-46. |
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| Authors: | GE Ti-da TANG Dong-mei LU Bo XIA Han -yan SONG Shi-wei HUANG Dan-feng |
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| Institution: | (School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 201101, China; School of Horticulture, North Agricultural University, Harbin 150030, China) |
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| Abstract: | Utilization of organic nitrogen (N) is an important aspect of plant N assimilation and has potential application in sustainable agriculture. A comparative study on plant N uptake using nitrate, ammonium, glycine and CK (N free) was studied in two tomato cultivars (Shenfen 918 and Huying 932). After 8 days of growth with the different N forms, root dry weight followed the series: NO3--N > Gly-N > CK > NH4+-N while root volume followed the series Gly-N > NO3--N > NH4+-N > CK in both cultivars. Root enzyme activities was the highest in the NO3--N or Gly-N treatment followed by NH4+-N treatment with CK showing the lowest activities. The concentration of NO3- and phosphate was highest in the NO3--N treatment followed by Gly-N and NH4+-N with CK showing the lowest concentrations. Ammonium, free amino acid and soluble sugar content of phloem and xylem sap in the Gly-N and NH4+-N treatments were higher in both cultivars followed by NO3--N and CK treatment. Rhizosphere pH was elevated by the NO3--N and Gly-N treatment, but decreased in the NH4+-N treatment. Soluble protein content in root exudates followed the series: NO3--N> Gly-N > NH4+-N > CK; however, different patterns were observed in xylem and phloem sap (Gly-N >NO3--N > NH4+-N > CK). Root enzyme activities were significantly different (P < 0.05) between the two cultivars. Root enzyme activities varied in the two different tomato cultivars with activities being highest in Huying 932 in all four N treatments. |
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| Keywords: | tomato mineral nitrogen organic nitrogen root exudates xylem sap phloem sap |
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