Effect of Purple Nonsulfur Bacteria (Rhodobacter sphaeroides) on the Growth and Quality of Komatsuna under Different Light Qualities

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The effect of purple nonsulfur bacteria (<I>Rhodobacter sphaeroides</I>) application on the growth and quality of Komatsuna (<I>Brassica campestris</I>) was investigated under different light qualities using blue (470 nm) and red (660 nm) light emitting diodes (LED) . Freeze dried purple nonsulfur bacteria (PTBP) were used for the investigation. Komatsuna plants were grown for 21 days with or without PTBP application under 3 different light qualities (blue-100%, red-100%, blue 20%-red 80%) at 20°C in a growth chamber. The PTBP application significantly promoted root growth under the blue-100% treatment, whereas the no PTBP application under the same light quality reduced root growth compared to the other light quality treatments. Moreover, the PTBP application under blue-100% increased chlorophyll and carotenoid contents, and reduced total sugar and ascorbic acid contents. On the other hand, the PTBP application under red-100% reduced nitrate and ascorbic acid contents. These results indicate that PTBP application significantly promotes growth and quality of Komatsuna under blue light, and may also compensate for red light.
日本生物環境工学会の論文