He Ming Ming, Wang Xiu Feng, Han Hui Hui, Jia Hai Chen, Wei Min, Shi Qing Hua, Yang Feng Juan
College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an 271018, Shandong, China.
State Key Laboratory of Crop Biology, Tai'an 271018, Shandong, China.
Ying Yong Sheng Tai Xue Bao. 2017 Mar 18;28(3):901-910. doi: 10.13287/j.1001-9332.201703.017.
The effects of iron deficiency and NO 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 NO 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 Fe 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 NO stress and the combined stress of iron deficiency and NO 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.
在亚适温（18℃/12℃（昼/夜））条件下，研究了缺铁和一氧化氮（NO）胁迫对番茄幼苗生长及铁吸收特性的影响。结果表明，与适温处理相比，亚适温下番茄幼苗生长受到显著抑制；株高、叶面积和干物质积累均显著降低。亚适温下缺铁对番茄幼苗生长的影响大于适温处理。在亚适温下，缺铁和/或NO胁迫处理的番茄幼苗株高与无胁迫处理无显著差异，但叶面积和叶片叶绿素含量明显降低。亚适温下番茄幼苗的叶片电解质渗漏率、根系活力和铁还原酶活性显著升高，但叶绿素含量、总根长、根表面积、根尖数和根体积明显降低。番茄幼苗根、茎、叶中的铁含量也显著下降。亚适温下NO胁迫以及缺铁与NO的复合胁迫加剧了番茄幼苗干物质的减少、叶片电解质渗漏和铁离子吸收的抑制。铁离子吸收对钾离子和钙离子的吸收表现出拮抗作用，但在不同器官间表现不同。通过降低营养液中铁离子浓度加剧了番茄幼苗的缺铁症状。
