Photosynthesis of non-foliar organs helps plants improve their survivability. Moso bamboo () is well-known for its great green culm, and the effect and mechanism underlying remains largely unclear. Firstly, we found that the culm had photosynthetic capacity, and its correlation with culm development stage in this study, the photosynthetic performance of bamboo shoot (culm with light 20 d) is higher than that of culm-forming bamboo (culm with light 5 a). However, the photosynthetic capacity of culms was much less than the respiratory capacity, photosynthetic products cannot be accumulated. Secondly, light was conducive to the growth of bamboo materials, promoting cell wall thickening and lignin accumulation, and the expression of transcripts of cellulose synthesis (, ) and lignin synthesis (, ) genes decreased significantly after shading. Furthermore, light affected the height growth rate of bamboo shoots, which promoted the elongation of developed internodes, and shading inhibited the continual elongation of developed internodes and initiated the elongation of multiple undeveloped internodes. Finally, shading greatly increased the length of undeveloped internode of bamboo shoots and provided a new strategy for the directional cultivation of long internode of bamboo. This study provided new insights into the photosynthetic capacity of non-foliar organs and the effect of light on the growth and development of non-foliar organs, which laid a foundation for further studying the rapid growth and development of Moso bamboo.

中文翻译：

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毛竹茎秆非叶器官光合作用及光对茎发育的影响

非叶器官的光合作用有助于植物提高生存能力。毛竹以其巨大的绿色竹秆而闻名，但其作用和机制仍不清楚。首先，我们发现竹秆具有光合能力，其与竹秆发育阶段的相关性，本研究中竹笋（光照20 d的竹秆）的光合性能高于成秆竹（光照5 a的竹秆）。 ）。但秆的光合能力远小于呼吸能力，不能积累光合产物。其次，光照有利于竹材的生长，促进细胞壁增厚和木质素积累，遮光后纤维素合成（，）和木质素合成（，）基因转录本的表达量显着下降。此外，光照影响竹笋的高度生长速率，促进发达节间的伸长，遮光则抑制发达节间的持续伸长，并引发多个未发育节间的伸长。最后，遮荫大大增加了竹笋未发育节间的长度，为竹子长节间定向栽培提供了新策略。该研究为非叶器官的光合能力以及光对非叶器官生长发育的影响提供了新的见解，为进一步研究毛竹的快速生长发育奠定了基础。