Effects of Different Combinations of Red and Blue Light on Morphology and Photosynthetic Characteristic of Tomato Seedlings  

作　　者：Hong WANG Chunxia YAO Ying WANG Weimin ZHU 

机构地区：[1]Protected Horticultural Research Institute,Shanghai Academy of Agricultural Sciences,Shanghai 201403,China [2]Key Laboratory of Protected Horticultural Technology,Shanghai 201403,China [3]Institute for Agro-food Standards and Testing Technology,Shanghai Academy of Agricultural Sciences,Shanghai 201403,China

出　　处：《Agricultural Biotechnology》2018年第5期54-57,共4页农业生物技术（英文版）

基　　金：Supported by Shanghai Science and Technology Commission Project,China(14DZ1206303);National Key Technology R&D Program(2014BAD05B05-05);Shanghai Agriculture Applied Technology Development Program,China(Grant No.20170201)

摘　　要：Blue and red light are spectral wavelengths more effective for plants. The effects of different ratios of red and blue light （R/B=2, R/B=4, R/B=8, R/B=12） provided by LEDs on morphology and photosynthetic characteristics of tomato seedlings were studied. The results showed that plant height, stem diameter, fresh weight, dry weight, seedling index and G value increased with the increase of R/B ratio until 8. On the contrary, SPDA value decreased with the increase of R/B ratio. Photosynthetic characteristics were measured by CO 2 assimilation （ Pn ）, stomatal conductance （ gs ） and intracellular CO 2 concentration （ Ci） . Pn and gs decreased with the increase of R/B ratio. Furthermore, similar trend was investigated in photochemical quenching （qP） and electron transport rate （ETR）. Results of this study suggest that compared with white LED, appropriate combination of red and blue light can enhance plant growth and photosynthetic characteristics, and the optimal blue/red ratio for tomato growth was R/B=8.Blue and red light are spectral wavelengths more effective for plants. The effects of different ratios of red and blue light （R/B=2, R/B=4, R/B=8, R/B=12） provided by LEDs on morphology and photosynthetic characteristics of tomato seedlings were studied. The results showed that plant height, stem diameter, fresh weight, dry weight, seedling index and G value increased with the increase of R/B ratio until 8. On the contrary, SPDA value decreased with the increase of R/B ratio. Photosynthetic characteristics were measured by CO 2 assimilation （ Pn ）, stomatal conductance （ gs ） and intracellular CO 2 concentration （ Ci） . Pn and gs decreased with the increase of R/B ratio. Furthermore, similar trend was investigated in photochemical quenching （qP） and electron transport rate （ETR）. Results of this study suggest that compared with white LED, appropriate combination of red and blue light can enhance plant growth and photosynthetic characteristics, and the optimal blue/red ratio for tomato growth was R/B=8.

关 键 词：Red and blue light TOMATO MORPHOLOGY Photosynthetic characteristics 

分 类 号：S641.2[农业科学—蔬菜学]