温室植物生产用人工光源研究进展

光是植物光合作用的能量源。温室植物体中的叶绿素a和叶绿素b分别吸收600～700nm的红光和400～520nm的蓝光进行光合作用。光同时是植物形态形成的信号源。600～700nm的红光能降低植物体内赤霉素的质量分数,从而减小节间长度和植株高度;而700～800nm的远红光能提高体内赤霉素的质量分数,从而增加节间长度和植株高度。基于温室植物对光的需求,分析了目前使用的温室传统人工光源的特性和存在的问题。发光二极管（LED）光源较传统人工光源具有明显的优势,但受限于单颗提供的光照度有限,必须组合使用才能满足温室植物正常生长发育对光的需求。尽管LED光源已成功应用于组培苗栽培,但组培室中组培苗的受光特性完全不同于温室作物,所以针对温室应用的LED成套光源有必要进一步研制。参32

Artificial light sources for production of greenhouse plants

Light is the energy source for photosynthesis in plants with chlorophyll a absorbing red light(600 -700 nm) and chlorophyll b absorbing blue light(400 -520 nm).Light is also the signal source of photomorphogenesis in plants.Red light can also reduce gibberellin(GA) content,which minishes internode length and plant height;however,far red light(700 -800 nm) can have the opposite affect and enhance GA.Based on the light demand of greenhouse plants,characteristics and problems with traditional artificial light sources presently used in a greenhouse were analyzed and showed that as an artificial light source,the light emitting diode(LED) had superiority over other artificial light sources.Subjected to limited photomet-ric brightness from an LED,an LED light source can be assembled to satisfy light demands for the natural growth of plants.Using an LED light source,plantlet cultivation has been successfully performed in vitro.As to the illuminative circumstances,however,there is a prodigious discrepancy between a plantlet in vitro and a greenhouse plant.Therefore,LED assembled light sources that are specially applied in the green-house should be further developed.Ch,32 ref.]