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[目的]探讨亚适宜温光环境对黄瓜(Cucumis sativus L.)幼苗生长、光合特性和含氮量的影响,探讨亚适宜温光环境对黄瓜生长和光合机构的影响机理及植物对亚适宜温光逆境的适应机制。[方法]亚适宜温光处理5、10 d。亚适宜温度为18/12℃,亚适宜光照强度为(200±20)μmol/(m2.s)。[结果]亚适宜温光环境处理显著抑制了黄瓜幼苗的生长,降低了生物量的积累和叶片含氮量,但对黄瓜根系含氮量基本无影响;随处理时间的延长,叶绿素a和b含量先增加后降低,处理5 d时气孔限制为光合作用下降的主要限制因素,10 d时非气孔限制为光合作用降低的主要限制因素。[结论]该研究可为寻找调控亚适宜温光环境的有效措施,指导冬春季节设施黄瓜生产提供理论依据。
[Objective] The research aimed to discuss the effects of sub-optimum temperature and light on the growth, photosynthetic characteristics and nitrogen content of cucumber (Cucumis sativus L.) seedlings. The effects of suboptimal temperature and light on the growth and photosynthetic mechanism of cucumber and the mechanism of subtropical temperature Adaptation mechanism of light adversity. [Method] Sub-optimum temperature and light for 5,10 d. The sub-suitable temperature was 18/12 ° C, and the sub-optimal light intensity was (200 ± 20) μmol / (m2.s). [Result] Sub-optimal temperature and light treatment significantly inhibited the growth of cucumber seedlings, reduced the biomass accumulation and leaf nitrogen content, but had little effect on the nitrogen content of cucumber roots. With the prolongation of treatment time, chlorophyll a and b The content increased firstly and then decreased, and the stomatal limitation was the main limiting factor of photosynthesis decline after 5 d treatment. The non-stomatal limitation was the main limiting factor of photosynthesis decrease at 10 d. [Conclusion] This research could provide a theoretical basis for finding effective measures to regulate sub-optimal temperature and light environment, and guiding the production of cucumber plants in winter and spring.