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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.Fe~(2+)对K~+和Ca~(2+)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Fe~(2+)浓度可使番茄幼苗的缺铁症状更加严重.
The effects of iron deficiency and nitrate stress on the growth and iron absorption of tomato seedlings under sub-optimal temperature (day / night 18 ℃ / 12 ℃) were studied.The results showed that the growth of tomato seedlings under sub-optimal temperature Under the condition of sub-optimal temperature, the effects of iron deficiency under sub-optimal temperature on the growth of tomato seedlings were greater than that under moderate temperature, There was no significant difference between the plant height and no - stress treatment under nitrate stress and simultaneous stress. However, the leaf area of seedlings obviously decreased, the electrolyte leakage rate, root vigor and ferric reductase activity increased significantly, while chlorophyll content decreased. Root length, root surface area, root volume and root tip number decreased significantly, and the contents of iron in roots, stems and leaves of seedlings decreased obviously.The simultaneous stress of sub-optimal temperature under nitrate stress and iron deficiency and nitrate increased the dry matter of tomato seedlings Accumulation decreased, the electrolyte leakage rate increased, and reduced the absorption of iron ions.Fe2 + antagonized the absorption of K ~ + and Ca2 +, the performance of different organs was different ; Reduce the nutrient solution of Fe ~ (2 +) concentration can Fan Symptoms of more severe iron deficiency seedlings.