不同光质对油菜幼苗生长的影响

油菜种子播种于盛有泥炭土、珍珠岩和蛭石的混合基质的培养皿，然后将培养皿放置在9种不同的光质进行培养:荧光灯（FL）、植物生长灯（PGL）、LEDs红光（R）、LEDs蓝光（B）、LEDs绿光（G）、LEDs白光（W）以及不同LEDs红、蓝配比光质（RB 2∶1，RB 3∶1及RB 4∶1）。结果表明，在LEDs绿光下，油菜幼苗高生长最高，其次是LEDs红光下生长的幼苗，而荧光灯下生长的幼苗最低，而且进一步结果表明，在单色光（绿光、红光及蓝光）下生长的幼苗高及生长速度均大于在复合光质中生长的油菜幼苗，但是不同的光质对幼苗生长早期高生长规律无影响。而幼苗根的生长、叶面积、叶绿素含量及幼苗地表茎粗结果与前相反，混合光源下的幼苗在这些方面明显优于单色光。同时，干、鲜质量结果也表明，单色光不适于油菜幼苗的生长，而在不同LEDs红、蓝配比光质下生长的幼苗质量不低于在荧光灯下生长的幼苗。幼苗茎段组织切片结果表明，在不同LEDs红、蓝配比的光质下生长的油菜幼苗均有大量初生木质部形成，尤其是在RB 3∶1光质中生长的幼苗，已初步具有完整的初生木质部及形成层，优于荧光灯下生长的幼苗。 

Influence of Light Quality on Growth of Oil Rape Seedlings

Rape seeds were sown in the mixture of vermiculite，perlite and peat（3∶1∶1）in petri dish and grown under nine different light qualities（fluorescent（FL），plant growth light（PGL），red LEDs（R），blue LEDs（B），green LEDs（G），white LEDs（W）and different ratio of red and blue LEDs（RB 2∶1，RB 3∶1 and RB 4∶1））respectively.The sixth and fourteenth days after sowing，the height of rape seedlings from soil surface was highest under G followed by R and the lowest was under FL.All results showed that plants under monochromatic lights（G，R and B）had a higher up-ground growth and average growth rate than those under multi-spectrum lights.While the inversed results were obtained in root induction，area of leaves，chlorophyll content and stem diameter between monochromatic lights and multi-spectrum lights in this study.The average growth rate was different among the light qualities，but light qualities could not change the growth regular of early growth stage of oil rape seedlings.The results of fresh and dry weight also indicated that monochromatic lights were not suit for the growth of rape seedling，while the mixed-spectrum light qualities of LED red and blue were preferred in rape seedlings growth.The histological examination results also indicated that the mixed light qualities of red and blue had better effective in inducing formulation of vascular cylinder than FL did.All results from this study showed that red and blue LEDs（RB3∶1）was the best light qualities for the early growth of rape seedling.