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- Title
CO<sub>2</sub>加富下水氮耦合对黄瓜叶片光合作用 和超微结构的影响.
- Authors
崔青青; 董彦红; 李曼; 张文东; 刘彬彬; 艾希珍; 毕焕改; 李清明
- Abstract
Using split plot and then-split plot design, effects of water-nitrogen coupling on photosynthesis and ultrastructure of cucumber (Cucum's sat'us) (Jinyou No.35) under CO2 enrichment were investigated. The main plot had two CO2 concentrations : ambient CO2 concentration (400 Lmol • mol-1 A) and doubled CO2 concentration (800±20 Lmol • 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 leal area significantly under high nitrogen. Under the condition ol normal irrigation, the photosynthetic rate, stomatal conductance and transpiration rate ol high nitrogen treatment were higher than low nitrogen treatment, while it was under the drought condition. Elevated CO2 enhanced the water use efficiency ol cucumber leal which increased with increasing nitrogen application rate. Under drought stress, cucumber adaxial surface porosity density was increased, and the CO2 enrichment and high nitrogen signilicantly reduced the stomatal density. Increasing nitrogen application improved the number ol chloroplast, and reduced that ol starch grains. Drought stress decreased the number ol chloroplast, but tended to promote the number ol starch grains. Drought stress increased the chloroplast length and width, and the size ol the starch grains, while high nitrogen reduced the length and width ol the chloroplast and starch grains. CO2 enrichment and high nitrogen increased grana thickness and layers (except ADN2), and the slice layer ol EDN2 was signilicantly higher than that ol ADN2. In conclusion, CO2 enrichment and suitable water and nitrogen could promote the development ol chloroplast thylakoid membrane system, signilicantly increase the thickness ol grana and the number ol grana lamella, and ellectively improve the chloroplast structure ol cucumber, which would benelit the photosynthesis ol cucumber plants and ability to utilize CO2 and water and nitrogen.
- Publication
Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao, 2017, Vol 28, Issue 4, p1237
- ISSN
1001-9332
- Publication type
Article
- DOI
10.13287/j.1001-9332.201704.024