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首页> 外文期刊>Journal of Experimental Botany >Consequences of C4 photosynthesis for the partitioning of growth: a test using C3 and C4 subspecies of Alloteropsis semialata under nitrogen-limitation
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Consequences of C4 photosynthesis for the partitioning of growth: a test using C3 and C4 subspecies of Alloteropsis semialata under nitrogen-limitation

机译：C 4 光合作用对生长分配的影响：在氮限制下利用半拟花异种植物C 3 和C 4 亚种进行的试验

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C4 plants dominate the world's subtropical grasslands, but investigations of their ecology typically focus on climatic variation, ignoring correlated changes in soil nutrient concentration. The hypothesis that higher photosynthetic nitrogen use efficiency (PNUE) in C4 than in C3 species allows greater flexibility in the partitioning of growth, especially under nutrient-deficient conditions, is tested here. Our experiment applied three levels of N supply to the subtropical grass Alloteropsis semialata, a unique model system with C3 and C4 subspecies. Photosynthesis was significantly higher for the same investment of leaf N in the C4 than C3 subspecies, and was unaffected by N treatments. The C4 plants produced more biomass than the C3 plants at high N levels, diverting a greater fraction of growth into inflorescences and corms, but less into roots and leaves. However, N-limitation of biomass production caused size-dependent shifts in the partitioning of growth. Root production was higher in small than large plants, and associated with decreasing leaf biomass in the C3, and inflorescence production in the C4 plants. Higher PNUE in the C4 than C3 subspecies was therefore linked with greater investment in sexual reproduction and storage, and the avoidance of N-limitations on leaf growth, suggesting advantages of the C4 pathway in disturbed and infertile ecosystems.
机译：C 4 植物在世界亚热带草原中占主导地位，但对其生态学的研究通常集中在气候变化上，而忽略了土壤养分浓度的相关变化。与C 3 物种相比，C 4 的光合氮利用效率（PNUE）更高的假设允许更大的灵活性的生长分配，特别是在营养缺乏的条件下。在这里测试。我们的实验对亚热带草种拟南芥应用了三个水平的氮供应，这是一个具有C 3 和C 4 亚种的独特模型系统。在C 4 中相同的叶N投入下的光合作用明显高于C 3 亚种，并且不受N处理的影响。在高氮水平下，C 4 植物比C 3 植物产生更多的生物量，将较大部分的生长转移至花序和球茎，而较少转移至根和叶。但是，生物量生产的N限制导致生长分配中大小依赖的变化。小型植物的根系生产高于大型植物，并且与C 3 的叶片生物量减少以及C 4 植物的花序生产有关。因此，C 4 比C 3 亚种的PNUE值更高，这与对有性生殖和贮藏的更多投资以及避免叶片生长受到N限制有关，这表明扰动和不育生态系统中的C 4 途径。

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