不同光谱LEDs对辣木幼苗生长及叶绿素含量的影响

Effects of Different Spectral LEDs on Seedlings Growth and Chlorophyll Content of Moringa oleifera Lam

[目的]研究LED补光对辣木幼苗生长及叶片中叶绿素含量的影响。[方法]以印度改良辣木(Moringa oleifera PKM-1)为试验材料,在相同外界环境下采用不同光谱条件的LEDs(Light Emitting Diodes)光源对辣木垂直补光,每组辣木补光12 h/d(8∶00—20∶00),测定不同补光处理下辣木幼苗的生长情况及其叶片中叶绿素含量。[结果]经红蓝4∶1(4R1B)LEDs处理的辣木种子发芽率高于对照,经过LEDs补光的3组辣木幼苗存活率均高于对照。LEDs补光处理的辣木幼苗株高、茎粗、全株干重、茎叶干重、总叶绿素含量均优于对照。其中光谱条件为全红的LEDs对辣木幼苗生长的促进效果最为显著,株高增加了120.66%,茎粗增加了52.11%,全株干重增加了52.35%,茎叶干重增加了33.57%,叶绿素总含量增加了19.28%。[结论]LED灯补光处理能显著促进辣木幼苗的生长及其叶片中叶绿素的合成。

[Objective] To study effects of different light emitting diode （LED） light-supplement on seedlings growth and chlorophyll content in leaves of M. oleifera Lain. [ Method ] With the provenance of India Moringa seeds （M. oleifera PKM-1 ） as raw materials, different spectral conditions LEDs was used to supply light with 12 h/d （8：00 -20：00 ） for it under the same external environment, and seedling growth and chlorophyll content were measured in leaves of M. oleifera Lain under different light-supplement treatment. [ Result] M. oleifera Lain seeds ger- mination rate by 4R1B LED treatment was higher than the control （CK）, survival rate of three groups M. oleifera Lam seedlings after LEDs light-supplement were higher than CK. Plant height, stem diameter, dry weight of whole plant, dry weight of stem and leaf, total chlorophyll content of M. oleifera Lam seedlings treated by LEDs light-supplement were better than CK. Among of them , the growth promoting effect was the most significant of it treated by all red LEDs, plant height increased by 120.66%, stem diameter increased by 52.11%, whole plant dry weight increased by 52.35 %, dry weight of stem and leaf increased by 33.57 % , total chlorophyll content increased by 19.28 %. [ Conclusion ] LEDs light-supplement treatment can significantly promote the synthesis of chlorophyll and leaf growth of M. oleifera Lam seedlings.