发光二极管光源对绿萝生长及光合特性的影响

为了解发光二极管（LED）对植物生长及光合特性的影响,选择绿萝Epipremnum aureum作为材料,栽种于2种LED和日光灯中45d后测定其生长指标及光合特性。结果表明：LED或日光灯条件下栽培绿萝在苗高、叶片数和叶片宽等指标上无差异,LED使绿萝叶间距缩短,叶长增长,但不同光质LED（红/蓝）之间无显著差异;绿萝光合速率、胞间二氧化碳摩尔分数、蒸腾速率和气孔导度表现为LED处理大于日光灯,LED处理中又以红蓝光（R/B）为4.3∶1.0大于2.8∶1.0。图4表2参13

Epipremnum aureum: growth and photosynthetic response to light-emitting diodes(LED)

Light-Emitting Diode(LED) is turning into an important research field as a promising irradiation source for plant factory.To determine the influence of LED on growth and photosynthesis of Epipremnum aureum,a fluorescent lamp and two LEDs,the combination of red and blue LED(R/B) = 2.8 and R/B = 4.3,were used with seedling height,leaf number,leaf width,leaf spacing,leaf length,light quality,net photosynthetic rate,intercellular CO2 concentration,transpiration rate,and stomatal conductance being measured after 45 d of growth with three replications.Results of a t test for the a fluorescent lamp and two LEDs showed no significant difference(P>0.05) for seedling height,leaf number,and leaf width,but significant difference(P<0.05) for leaf spacing and leaf length,leaf spacing for LEDs decreased,whereas corresponding leaf length increased.With the two LEDs,light quality differences were slight.Also,signifi-cant difference(P<0.05) for net photosynthetic rate,intercellular CO2 concentration,transpiration rate,and stomatal conductance,these indexs with LEDs were higher than for a fluorescent lamp.Thus,for the two LED sources,the LED with R/B = 4.3 was more suitable for growth of E.aureum.[Ch,4 fig.2 tab.13 ref.]