Ke Xinglin, Yoshida Hideo, Hikosaka Shoko, Goto Eiji
Graduate School of Horticulture, Chiba University, Matsudo 648, Chiba 271-8510, Japan.
Plant Molecular Research Center, Chiba University, Chiba 260-0856, Japan.
Plants (Basel). 2021 Dec 31;11(1):121. doi: 10.3390/plants11010121.
Dwarf tomatoes are advantageous when cultivated in a plant factory with artificial light because they can grow well in a small volume. However, few studies have been reported on cultivation in a controlled environment for improving productivity. We performed two experiments to investigate the effects of photosynthetic photon flux density (PPFD; 300, 500, and 700 μmol m s) with white light and light quality (white, R3B1 (red:blue = 3:1), and R9B1) with a PPFD of 300 μmol m s on plant growth and radiation-use efficiency (RUE) of a dwarf tomato cultivar ('Micro-Tom') at the vegetative growth stage. The results clearly demonstrated that higher PPFD leads to higher dry mass and lower specific leaf area, but it does not affect the stem length. Furthermore, high PPFD increased the photosynthetic rate (Pn) of individual leaves but decreased RUE. A higher blue light proportion inhibited dry mass production with the same intercepted light because the leaves under high blue light proportion had low Pn and photosynthetic light-use efficiency. In conclusion, 300 μmol m s PPFD and R9B1 are the recommended proper PPFD and light quality, respectively, for 'Micro-Tom' cultivation at the vegetative growth stage to increase the RUE.
矮生番茄在人工光照植物工厂中栽培具有优势，因为它们能在小空间内良好生长。然而，关于在可控环境中栽培以提高产量的研究报道较少。我们进行了两项实验，以研究光合光子通量密度（PPFD；300、500和700 μmol·m⁻²·s⁻¹）的白光以及光质（白光、R3B1（红:蓝 = 3:1）和R9B1）且PPFD为300 μmol·m⁻²·s⁻¹对矮生番茄品种（“Micro-Tom”）营养生长阶段的植株生长和辐射利用效率（RUE）的影响。结果清楚地表明，较高的PPFD会导致更高的干质量和更低的比叶面积，但不影响茎长。此外，高PPFD增加了单叶的光合速率（Pn）但降低了RUE。较高的蓝光比例在相同截获光的情况下抑制了干物质生产，因为高蓝光比例下的叶片Pn和光合光利用效率较低。总之，300 μmol·m⁻²·s⁻¹的PPFD和R9B1分别是营养生长阶段“Micro-Tom”栽培提高RUE的推荐适宜PPFD和光质。
