Hayashi Sota, Levine Christopher P, Yu Wakabayashi, Usui Mayumi, Yukawa Atsuyuki, Ohmori Yoshihiro, Kusano Miyako, Kobayashi Makoto, Nishizawa Tomoko, Kurimoto Ikusaburo, Kawabata Saneyuki, Yamori Wataru
Institute for Sustainable Agro-ecosystem Services, The University of Tokyo, Nishitokyo, Tokyo, Japan.
Plants Laboratory Inc., Nishitokyo, Japan.
Front Plant Sci. 2024 Apr 16;15:1352331. doi: 10.3389/fpls.2024.1352331. eCollection 2024.
While it is commonly understood that air temperature can greatly affect the process of photosynthesis and the growth of higher plants, the impact of root zone temperature (RZT) on plant growth, metabolism, essential elements, as well as key metabolites like chlorophyll and carotenoids, remains an area that necessitates extensive research. Therefore, this study aimed to investigate the impact of raising the RZT on the growth, metabolites, elements, and proteins of red leaf lettuce. Lettuce was hydroponically grown in a plant factory with artificial light at four different air temperatures (17, 22, 27, and 30°C) and two treatments with different RZTs. The RZT was raised 3°C above the air temperature in one group, while it was not in the other group. Increasing the RZT 3°C above the air temperature improved plant growth and metabolites, including carotenoids, ascorbic acids, and chlorophyll, in all four air temperature treatments. Moreover, raising the RZT increased Mg, K, Fe, Cu, Se, Rb, amino acids, and total soluble proteins in the leaf tissue at all four air temperatures. These results showed that raising the RZT by 3°C improved plant productivity and the metabolites of the hydroponic lettuce by enhancing nutrient uptake and activating the metabolism in the roots at all four air temperatures. Overall, this research demonstrates that plant growth and metabolites can be improved simultaneously with an increased RZT relative to air temperature. This study serves as a foundation for future research on optimizing RZT in relation to air temperature. Further recommended studies include investigating the differential effects of multiple RZT variations relative to air temperature for increased optimization, examining the effects of RZT during nighttime versus daytime, and exploring the impact of stem heating. This research has the potential to make a valuable contribution to the ongoing growth and progress of the plant factory industry and fundamental advancements in root zone physiology. Overall, this research demonstrates that plant growth and metabolites can be improved simultaneously with an increased RZT relative to air temperature. This study serves as a foundation for future research on optimizing RZT in relation to air temperature. Further recommended studies include investigating the differential effects of multiple RZT variations relative to air temperature for increased optimization, examining the effects of RZT during nighttime versus daytime, and exploring the impact of stem heating. This research has the potential to make a valuable contribution to the ongoing growth and progress of the plant factory industry and fundamental advancements in root zone physiology.
虽然人们普遍认为气温会极大地影响光合作用过程和高等植物的生长，但根区温度（RZT）对植物生长、代谢、必需元素以及叶绿素和类胡萝卜素等关键代谢产物的影响，仍是一个需要广泛研究的领域。因此，本研究旨在探讨提高根区温度对红叶生菜生长、代谢产物、元素和蛋白质的影响。生菜在人工光照的植物工厂中进行水培，设置了四种不同的气温（17、22、27和30°C）以及两种不同根区温度的处理。一组根区温度比气温高3°C，另一组则与气温相同。在所有四种气温处理中，将根区温度比气温提高3°C均改善了植物生长和代谢产物，包括类胡萝卜素、抗坏血酸和叶绿素。此外，在所有四种气温下，提高根区温度均增加了叶片组织中的镁、钾、铁、铜、硒、铷、氨基酸和总可溶性蛋白质。这些结果表明，在所有四种气温下，将根区温度提高3°C可通过增强养分吸收和激活根部代谢来提高水培生菜的生产力和代谢产物。总体而言，本研究表明，相对于气温提高根区温度可同时改善植物生长和代谢产物。本研究为未来关于优化根区温度与气温关系的研究奠定了基础。进一步推荐的研究包括调查相对于气温的多种根区温度变化的差异效应以实现更高程度的优化，研究夜间与白天根区温度的影响，以及探索茎部加热的影响。本研究有可能对植物工厂行业的持续发展和根区生理学的基础进步做出宝贵贡献。总体而言，本研究表明，相对于气温提高根区温度可同时改善植物生长和代谢产物。本研究为未来关于优化根区温度与气温关系的研究奠定了基础。进一步推荐的研究包括调查相对于气温的多种根区温度变化的差异效应以实现更高程度的优化，研究夜间与白天根区温度的影响，以及探索茎部加热的影响。本研究有可能对植物工厂行业的持续发展和根区生理学的基础进步做出宝贵贡献。
