PDF(Pubmed)
Abstract：
The effect of the ratio of red and blue light on fruit biomass radiation-use efficiency (FBRUE) in dwarf tomatoes has not been well studied. Additionally, whether white light offers a greater advantage in improving radiation-use efficiency (RUE) and FBRUE over red and blue light under LED light remains unknown. In this study, two dwarf tomato cultivars (\'Micro-Tom\' and \'Rejina\') were cultivated in three red-blue light treatments (monochromatic red light, red/blue light ratio = 9, and red/blue light ratio = 3) and a white light treatment at the same photosynthetic photon flux density of 300 μmol m-2 s-1. The results evidently demonstrated that the red and blue light had an effect on FBRUE by affecting RUE rather than the fraction of dry mass partitioned into fruits (Ffruits). The monochromatic red light increased specific leaf area, reflectance, and transmittance of leaves but decreased the absorptance and photosynthetic rate, ultimately resulting in the lowest RUE, which induced the lowest FBRUE among all treatments. A higher proportion of blue light (up to 25%) led to a higher photosynthetic rate, resulting in a higher RUE and FBRUE in the three red-blue light treatments. Compared with red and blue light, white light increased RUE by 0.09-0.38 g mol-1 and FBRUE by 0.14-0.25 g mol-1. Moreover, white light improved the Ffruits in \'Rejina\' and Brix of fruits in \'Micro-Tom\' and both effects were cultivar-specific. In conclusion, white light may have greater potential than mixed red and blue light for enhancing the dwarf tomato FBRUE during their reproductive growth stage.
摘要：
尚未很好地研究红光和蓝光的比例对矮小番茄果实生物量辐射利用效率（FBRUE）的影响。此外,白光是否在改善辐射使用效率（RUE）方面提供更大的优势，并且在LED光下FPRUE超过红光和蓝光仍然未知。在这项研究中,在三种红蓝光处理中培养了两个矮小番茄品种（\'Micro-Tom\'和\'Rejina\'）（单色红光，红/蓝光比=9，红/蓝光比=3）和在300μmolm-2s-1的相同光合光子通量密度下进行白光处理。结果明显表明，红光和蓝光通过影响RUE而不是分配到水果中的干重分数（Ffruits）对FBRUE有影响。单色红光增加了比叶面积，反射率,和叶片的透光率，但降低了吸收率和光合速率，最终导致最低的RUE，在所有治疗中诱导最低的FBRUE。较高比例的蓝光（高达25％）导致较高的光合速率，在三个红蓝光处理中导致更高的RUE和FBRUE。与红光和蓝光相比，白光使RUE增加0.09-0.38gmol-1，使FBRUE增加0.14-0.25gmol-1。此外，白光改善了\'Rejina\'和\'Micro-Tom\'中水果的白利糖度，这两种效果都是品种特异性的。总之,白光可能比红色和蓝色混合光具有更大的潜力，可以增强矮小番茄的繁殖生长阶段的FBRUE。
