These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


PUBMED FOR HANDHELDS

Search MEDLINE/PubMed


  • Title: [Effect of water-nitrogen coupling on photosynthesis and ultrastructure of cucumber leaves under CO2 enrichment].
    Author: Cui QQ, Dong YH, Li M, Zhang WD, Liu BB, Ai XZ, Bi HG, Li QM.
    Journal: Ying Yong Sheng Tai Xue Bao; 2017 Apr 18; 28(4):1237-1245. PubMed ID: 29741321.
    Abstract:
    Using split plot and then-split plot design, effects of water-nitrogen coupling on photosynthesis and ultrastructure of cucumber (Cucumis sativus) (Jinyou No.35) under CO2 enrichment were investigated. The main plot had two CO2 concentrations: ambient CO2 concentration (400 μmol·mol-1, A) and doubled CO2 concentration (800±20 μmol·mol-1, E). The split plot had two treatments: no drought stress (95% of field capacity, W) and drought stress (75% of field capacity, D). The then-split plot contained low nitrogen treatment (450 kg·hm-2, N1) and high nitrogen treatment (900 kg·hm-2, N2). The results showed that under the condition of drought and high nitrogen, increasing CO2 enhanced the cucumber plant height, and no matter what kinds of water treatment, CO2 enrichment increased the leaf area significantly under high nitrogen. Under the condition of normal irrigation, the photosynthetic rate, stomatal conductance and transpiration rate of high nitrogen treatment were higher than low nitrogen treatment, while it was under the drought condition. Elevated CO2 enhanced the water use efficiency of cucumber leaf which increased with increasing nitrogen application rate. Under drought stress, cucumber adaxial surface porosity density was increased, and the CO2 enrichment and high nitrogen significantly reduced the stomatal density. Increasing nitrogen application improved the number of chloroplast, and reduced that of starch grains. Drought stress decreased the number of chloroplast, but tended to promote the number of starch grains. Drought stress increased the chloroplast length and width, and the size of the starch grains, while high nitrogen reduced the length and width of the chloroplast and starch grains. CO2 enrichment and high nitrogen increased grana thickness and layers (except ADN2), and the slice layer of EDN2 was significantly higher than that of ADN2. In conclusion, CO2 enrichment and suitable water and nitrogen could promote the development of chloroplast thylakoid membrane system, significantly increase the thickness of grana and the number of grana lamella, and effectively improve the chloroplast structure of cucumber, which would benefit the photosynthesis of cucumber plants and ability to utilize CO2 and water and nitrogen. 以‘津优35号’黄瓜为试材,采用裂区-再裂区设计,研究了CO2加富下水氮耦合对黄瓜叶片光合作用和超微结构的影响.主区设大气CO2浓度(400 μmol·mol-1,A)和加富CO2浓度(800±20 μmol·mol-1,E)2个CO2浓度处理,裂区设无干旱胁迫(田间持水量的95%,W)和干旱胁迫(田间持水量的75%,D)2个水分处理,再裂区设施氮量450 kg·hm-2(低氮,N1)和900 kg·hm-2(高氮,N2)2个氮素处理.结果表明: 在干旱和高氮条件下,CO2加富提高了黄瓜的株高,且使高氮下的叶面积显著增加.正常灌溉条件下,高氮处理的光合速率、气孔导度和蒸腾速率高于低氮处理,而干旱条件下则相反;CO2加富提高了黄瓜叶片的水分利用效率,并且随着施氮量的增加,其水分利用效率提高.干旱胁迫下,黄瓜近轴面气孔密度增加,而CO2加富和高氮却显著降低了气孔密度.高氮处理增加了黄瓜叶片叶绿体数量而减少了淀粉粒数量,干旱胁迫使叶绿体数量减少,但使淀粉粒数量呈上升趋势.干旱胁迫增加了叶绿体长度和宽度,显著增加了淀粉粒的大小,而高氮降低了叶绿体和淀粉粒的长度和宽度.CO2加富和高氮均使基粒厚度和片层数增加(ADN2除外),并且EDN2处理的片层数显著高于ADN2.综上所述,CO2加富和适宜的水、氮条件能促进黄瓜叶片叶绿体类囊体膜系的发育,显著增加基粒厚度和基粒片层数,有效改善黄瓜的叶绿体结构,增强光合性能,提高黄瓜植株对CO2和水、氮的吸收利用能力.
    [Abstract] [Full Text] [Related] [New Search]