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应用生态学报 ›› 2017, Vol. 28 ›› Issue (3): 901-910.doi: 10.13287/j.1001-9332.201703.017

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亚适温条件下缺铁和硝酸盐胁迫对番茄幼苗生长及铁吸收的影响

何明明1, 王秀峰1,2*, 韩会会1, 贾海晨1, 魏珉1,2, 史庆华1,2, 杨凤娟1,2   

  1. 1山东农业大学园艺科学与工程学院, 山东泰安 271018
    2作物生物学国家重点实验室, 山东泰安 271018
  • 收稿日期:2016-07-15 发布日期:2017-03-18
  • 通讯作者: *E-mail: xfwang@sdau.edu.cn
  • 作者简介:何明明,女,1991年生,硕士研究生.主要从事设施蔬菜与无土栽培方面的研究.E-mail:1528749641@qq.com
  • 基金资助:
    本文由国家现代农业产业技术体系大宗蔬菜建设专项(CARS-25)资助

Effects of iron deficiency and NO3- stress on tomato seedlings growth and iron absorption under suboptimal temperature

HE Ming-ming1, WANG Xiu-feng1,2*, HAN Hui-hui1, JIA Hai-chen1, WEI Min1,2, SHI Qing-hua1,2, YANG Feng-juan1,2   

  1. 1College of Horticulture Science and Engineering, Shandong Agricultural University, Tai’an 271018, Shandong, China
    2State Key Laboratory of Crop Biology, Tai’an 271018, Shandong, China
  • Received:2016-07-15 Published:2017-03-18
  • Contact: *E-mail: xfwang@sdau.edu.cn
  • Supported by:
    This work was supported by Special Project of China Modern Agriculture Technology System (CARS-25)

摘要: 研究亚适温(昼/夜18 ℃/12 ℃)条件下缺铁和硝酸盐胁迫对番茄幼苗生长及铁吸收的影响.结果表明: 与适温对照相比,亚适温条件下番茄幼苗生长受到明显的抑制,株高、叶面积显著变小,干物质积累下降;亚适温下缺铁对番茄幼苗生长的影响比适温下缺铁的影响大.亚适温条件下,缺铁、硝酸盐胁迫及二者同时胁迫的番茄幼苗株高与无胁迫处理差异不显著,但幼苗叶面积明显变小,电解质渗漏率、根系活力和三价铁还原酶活性明显增加,叶绿素含量降低;根总长、根表面积、根体积及根尖数明显减小;幼苗根、茎、叶中铁含量明显降低.亚适温下硝酸盐胁迫以及缺铁与硝酸盐二者同时胁迫加重了番茄幼苗干物质积累的减少、电解质渗漏率的增加,以及减少了对铁离子的吸收.Fe2+对K+和Ca2+吸收具有拮抗作用,不同器官中的表现有所差异;降低营养液中的Fe2+浓度可使番茄幼苗的缺铁症状更加严重.

Abstract: The effects of iron deficiency and NO3- stress on the growth and the iron absorption cha-racteristic of tomato seedlings were investigated under suboptimal temperature (18 ℃/12 ℃ (day/night)). The results indicated that the growth was significantly inhibited under suboptimal temperature compared with appropriate temperature treatment; the plant heights, leaf areas and dry matter accumulations were markedly decreased. The effects of iron deficiency under suboptimal temperature on the growth of tomato seedlings were larger than that of under appropriate temperature treatments. Under suboptimal temperature, the plant heights of tomato seedlings in iron deficiency and/or NO3- stress treatments were not significantly different from no stress treatment, but leaf areas and leaf chlorophyll content of tomato seedlings were decreased obviously. The leaf electrolytic leakage, root activity and Fe3+ reductase activity of tomato seedlings were markedly increased under suboptimal temperature, but chlorophyll content, total root length, root surface area, root tip number and root volume were obviously reduced. The iron contents in roots, stems and leaves of tomato seedlings were also remarkably decreased. The NO3- stress and the combined stress of iron deficiency and NO3- stress under suboptimal temperature aggravated the reduction of dry matter, leaf electrolytic leakage and the inhibition of iron ion absorption in tomato seedlings. The iron ion absorption showed the antagonistic impact on the absorption of potassium and calcium ion, but showed different effects among different organs. The iron deficiency symptom of tomato seedlings was aggravated by reducing the concentration of iron ion in the nutrient solution.