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<p>Photosynthetic Nitrogen Use Efficiency (PNUE), which is defined as the ratio of photosynthetic capacity to leaf nitrogen content, is a critical determinant of nutrient utilization and physiological performance in plant leaves. This study presents a comparative analysis of Photosynthetic Nitrogen Use Efficiency (PNUE) across ten tea plant (<i>Camellia sinensis</i>) cultivars under uniform conditions, and a detailed examination of three cultivars under varying light intensities, including no shade and two levels of shading (one and two layers of shade netting). We found significant variations in PNUE among 10 tea plant cultivars, with the lowest value detected in the albino tea plant cultivar. Leaf structure was identified as a key factor influencing PNUE. In particular, PNUE was negatively correlated with the palisade tissue and positively correlated with the lower epidermis thickness and the photosynthesis rate. Under high light conditions, shading treatments enhanced PNUE by increasing nitrogen allocation to specific leaf photosynthetic components, namely the carboxylation system and the light-harvesting system. This effect could be attributed to increase in spongy tissue thickness and decrease in the mesophyll tissue proportion resulting from shading. Our findings reveal the intricate relationship between leaf structure, light intensity, and nitrogen allocation, offering new insights into optimizing tea cultivation practices for enhanced nitrogen use efficiency and photosynthetic performance.</p>

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Shading Improves Photosynthetic Nitrogen Use Efficiency in the Tea Plant by Increasing Nitrogen Allocation to Leaf Photosynthetic Components and Spongy Tissue Thickness

  • 期刊论文

  • 发表日期：

    2026年7月8日

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  • Liuru Chen,
  • Ying He,
  • Bo-Wen Zhou,
  • Hua Zhang,
  • Yanjiang Cai,
  • Jianyun Ruan,
  • Lili Sun,
  • Meiya Liu,
  • Qunfeng Zhang

摘要

Photosynthetic Nitrogen Use Efficiency (PNUE), which is defined as the ratio of photosynthetic capacity to leaf nitrogen content, is a critical determinant of nutrient utilization and physiological performance in plant leaves. This study presents a comparative analysis of Photosynthetic Nitrogen Use Efficiency (PNUE) across ten tea plant (Camellia sinensis) cultivars under uniform conditions, and a detailed examination of three cultivars under varying light intensities, including no shade and two levels of shading (one and two layers of shade netting). We found significant variations in PNUE among 10 tea plant cultivars, with the lowest value detected in the albino tea plant cultivar. Leaf structure was identified as a key factor influencing PNUE. In particular, PNUE was negatively correlated with the palisade tissue and positively correlated with the lower epidermis thickness and the photosynthesis rate. Under high light conditions, shading treatments enhanced PNUE by increasing nitrogen allocation to specific leaf photosynthetic components, namely the carboxylation system and the light-harvesting system. This effect could be attributed to increase in spongy tissue thickness and decrease in the mesophyll tissue proportion resulting from shading. Our findings reveal the intricate relationship between leaf structure, light intensity, and nitrogen allocation, offering new insights into optimizing tea cultivation practices for enhanced nitrogen use efficiency and photosynthetic performance.