摘要
应用溶液培养法,采用全根和分根2种培养方式,研究了不同NO3-、NH4+配比处理下,番茄幼苗不同部位中12种营养元素含量的差异。结果表明,在全根和分根培养下,番茄体内总N浓度:花>叶、根>茎。在全根培养下,叶片和茎中总N浓度随营养液中NH4+比例增加而增加,适量增铵(NO3-:NH4+=75:25)显著提高了根系中P和K含量;在分根培养下,局部根系供单一NH4+营养显著降低了花和茎中总N浓度,提高了自身根系中总N浓度,但降低了两侧根系中P和K浓度。全部和局部根系供单一NH4+和NO3-、NH4+混合营养均降低了番茄幼苗各部位中Ca和Mg含量,但增加了叶片中S含量。在全根培养下,增加营养液中NH4+比例,增加了叶片中B和Mn含量,同时增加了叶片和根系中Zn和Mo含量。在分根培养下,局部根系供单一NH4+营养显著增加了自身根系中Fe、B、Zn、Cu和Mo含量。另外,全部和局部根系供混合N素营养(NO3-:NH4+=75:25)提高了N、P和K在体内总积累量。以上研究结果表明,培养方式和形态氮素均可影响营养元素在番茄幼苗体内的含量和积累量。
In the present study,whole-and split-root experiments were together conducted to study the effects of different nitrogen （N） forms on the concentration and accumulation of nutrient elements in different parts of tomato （Lycopersicon esculentum Mill.） seedlings.Results obtained were as follows.Under both homogeneous and localized supply,the concentration of total N in flower was higher than those in leaf and root and they are all higher than that in stem.In a whole-root system,with the increase of NH 4 ＋ /NO 3 ratio in nutrient solution,the concentration of total N increased both in leaf and stem.The mixed supply of NO 3 and NH 4 ＋ nutrition at the ratio of 75：25 led to a significant increase in the concentration of phosphorus （P） and potassium （K） in root.In a split-root system,however,when compared to sole NO 3 supply （N｜N）,localized supply of sole NH 4 ＋ （N｜A） significantly decreased the concentration of total N both in flower and stem,but increased the concentration of total N in the root which was exposed to sole NH 4 ＋,also it decreased the concentration of P and K in both halfroots in N｜A treatment.Localized supply of either sole NH 4 ＋ or the mixture of NO 3 and NH 4 ＋ at the ratio of 75：25 both decreased the concentration of calcium （Ca） and magnesium （Mg） in all parts of tomato plants but increased the concentration of sulphur （S） in leaves.With the increase of NH 4 ＋ /NO 3 ratio in nutrient solution in a homogeneous supply,the concentration of boron （B） and manganese （Mn） in leaves and Zinc （Zn） and molybdenum （Mo） in leaves and root all increased.Local supply of sole NH 4 ＋ in solution significantly increased the concentration of Fe,B,Zn,Cu and Mo in self-root.In addition,the mixed supply of NH 4 ＋ /NO 3 led to a significant increase in N,P and K accumulation in the plants no matter what culture mode was.In conclusion,both culture modes and nitrogen forms can affect the concentration and accumulation of nutrient element in tomato seedling.
出处
《中国农学通报》
CSCD
北大核心
2010年第21期122-130,共9页
Chinese Agricultural Science Bulletin
基金
国家自然科学基金项目"不同形态氮素调控果实有机酸代谢的分子生理机制"(30600382)
土壤与农业可持续发展国家重点试验室开放基金项目"增铵营养提高番茄产量
调控果实有机酸代谢的分子生理机制"(055131)
关键词
番茄
全根培养
分根培养
不同形态氮素
营养元素含量
tomato
homogeneous supply
localized supply
different nitrogen forms
nutrient element content
作者简介
卢颖林，男，1979年出生，博士，主要从事植物营养及生理生态研究。通信地址：510316广东省广州市海珠区赤岗石榴岗路10号广州甘蔗糖业研究所，Tel：020—84178928，E-mail：fanyang21st@126．com。
通讯作者：董彩霞，女，1972年出生，副教授，主要从事植物营养研究。通信地址：210095江苏省南京市玄武区卫岗1号南京农业大学资环学院植物营养系，Tel：025-84396393，E-mail：cxdong@njau．edu．cn。
