Age-Related Changes in Culm Respiration of Phyllostachys pubescens Culms With Their Anatomical and Morphological Traits
Age-Related Changes in Culm Respiration of Phyllostachys pubescens Culms With Their Anatomical and Morphological Traits
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DOI：
10.3389/ffgc.2022.868732
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发表时间：
2022-04
期刊：
影响因子：
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通讯作者：
Eiko M. Uchida;Ayumi Katayama;Y. Yasuda;T. Enoki;K. Otsuki;S. Koga;Yasuhiro Utsumi
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文献类型：
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作者：
Eiko M. Uchida;Ayumi Katayama;Y. Yasuda;T. Enoki;K. Otsuki;S. Koga;Yasuhiro Utsumi
与树木相比，人们对竹子的呼吸特性，特别是竹子的呼吸作用知之甚少。本研究测定了当年生、2年生、3年生和4年生以上毛竹的呼吸强度，并探讨了其与竹材形态和解剖结构的关系。当年秆的呼吸强度(1.90±0.46μmolm-2 S-1)显著高于老秆(2年生、3年生和4年生以上平均值：0.17±0.09μmolm-2 S-1)。竹材密度随着年龄的增长而增加，竹材组织中薄壁组织的细胞壁同时加厚。竹材组织中的氮含量随竹龄的增加而降低。竹材密度和含氮量均与竹材呼吸速率呈显著正相关。另一方面，茎高、壁厚和周长不影响茎的呼吸速率。虽然竹子的大小全年不变，但随着竹子老化，竹子组织中的解剖变化会影响呼吸。竹龄对竹林呼吸特性的评价有显著影响。我们的结果表明，随着细胞壁的加厚，幼茎需要大量的呼吸来“向内”生长，并保持相对大量的活跃组织。
Compared to trees, little is known about the respiratory characteristics of bamboo, especially culm respiration. In this study, we measured the respiration rates of current year, 2, 3, and above 4-year-old Moso bamboo (Phyllostachys pubescens) culms and examined its relation to culm morphology and anatomical structure. Current year culms had substantially higher respiration rates (1.9 ± 0.46 μmol m–2 s–1) compared to older culms (2, 3, and above 4-year-old average: 0.17 ± 0.09 μmol m–2 s–1). Culm wood density increased with age, with the concurrent thickening of parenchyma cell walls in the culm tissue. Nitrogen content in the culm tissue decreased with culm age. Both culm wood density and nitrogen content had significant relationships with culm respiration rate. On the other hand, culm height, wall thickness, and circumference did not affect culm respiration rate. Although bamboo culms did not change in size through the year, anatomical changes in the culm tissue that accompanied the aging of a culm affected the respiration. The culm age would have a significant effect on the evaluation of the respiratory characteristics of the bamboo forest. Our results suggested that young culms required a large amount of respiration to grow “inward” as cell wall thickening and also to maintain the relatively large amount of active tissue.