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<p>Rice seedling transplanting is the primary method used in paddy fields, but transplant shock during the early seedling stage can reduce survival rates and delay plant maturation. To investigate the morphological and physiological responses of rice seedlings under various light qualities, TNG67 (<i>O. sativa</i> L. ssp. <i>Japonica</i>) and IR64 (<i>O. sativa</i> L. ssp. <i>Indica</i>) rice seedlings were grown under various light-emitting diode (LED) treatments, including white light (WL), a 10:8 ratio of blue light (BL) to red light (RL) abbreviated to RL/BL (0.8), a 10:4 mixture of RL/BL (0.4), RL, and BL. After 9&#xa0;days of light treatment (DAT), RL was beneficial for plant height and leaf length, while leaf number, width, and angle, and root length and number were greatly promoted by BL treatment. Furthermore, RL/BL (0.8) and RL/BL (0.4) treatments showed better biomass accumulation at 9 DAT. Chlorophyll and carotenoid contents in IR64 seedlings were higher under RL/BL (0.4) and BL treatments at 9 DAT than other light treatments, although no significant differences were observed in TNG67 across all light treatments. A significantly greater 2,2-diphenyl-1-picrylhydrazyl scavenging effect was observed in the leaves cultured for 9 DAT at RL/BL (0.8) and RL/BL (0.4) treatments compared to BL or RL treatments. Tiller number slowly increased with prolonged exposure to various LED lights, with IR64 tiller number being remarkably higher than that of TNG67 across all light treatments. Using optimal LED spectra can enhance rice seedling quality, thereby maximizing economic benefits for growers in precision agriculture.</p>

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Optimizing Light Quality to Enhance Morphological and Physiological Responses in Japonica and Indica Rice Seedlings

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • Yun-Wei Kuo,
  • Kuan-Hung Lin,
  • Yi-Zhang Chen,
  • Yue-Cing Su,
  • Hsin-Hung Lin

摘要

Rice seedling transplanting is the primary method used in paddy fields, but transplant shock during the early seedling stage can reduce survival rates and delay plant maturation. To investigate the morphological and physiological responses of rice seedlings under various light qualities, TNG67 (O. sativa L. ssp. Japonica) and IR64 (O. sativa L. ssp. Indica) rice seedlings were grown under various light-emitting diode (LED) treatments, including white light (WL), a 10:8 ratio of blue light (BL) to red light (RL) abbreviated to RL/BL (0.8), a 10:4 mixture of RL/BL (0.4), RL, and BL. After 9 days of light treatment (DAT), RL was beneficial for plant height and leaf length, while leaf number, width, and angle, and root length and number were greatly promoted by BL treatment. Furthermore, RL/BL (0.8) and RL/BL (0.4) treatments showed better biomass accumulation at 9 DAT. Chlorophyll and carotenoid contents in IR64 seedlings were higher under RL/BL (0.4) and BL treatments at 9 DAT than other light treatments, although no significant differences were observed in TNG67 across all light treatments. A significantly greater 2,2-diphenyl-1-picrylhydrazyl scavenging effect was observed in the leaves cultured for 9 DAT at RL/BL (0.8) and RL/BL (0.4) treatments compared to BL or RL treatments. Tiller number slowly increased with prolonged exposure to various LED lights, with IR64 tiller number being remarkably higher than that of TNG67 across all light treatments. Using optimal LED spectra can enhance rice seedling quality, thereby maximizing economic benefits for growers in precision agriculture.