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首页> 外文期刊>Journal of Experimental Botany >Does ear C sink strength contribute to overcoming photosynthetic acclimation of wheat plants exposed to elevated CO2?
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Does ear C sink strength contribute to overcoming photosynthetic acclimation of wheat plants exposed to elevated CO2?

机译：C穗沉强度是否有助于克服暴露于较高CO2的小麦植物的光合适应性？

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摘要

Wheat plants (Triticum durum Desf., cv. Regallo) were grown in the field to study the effects of contrasting [CO2] conditions (700 versus 370 mu mol mol(-1)) on growth, photosynthetic performance, and C management during the post-anthesis period. The aim was to test whether a restricted capacity of sink organs to utilize photosynthates drives a loss of photosynthetic capacity in elevated CO2. The ambient C-13/C-12 isotopic composition (delta C-13) of air CO2 was changed from -10.2 parts per thousand in ambient [CO2] to -23.6 parts per thousand under elevated [CO2] between the 7th and the 14th days after anthesis in order to study C assimilation and partitioning between leaves and ears. Elevated [CO2] had no significant effect on biomass production and grain filling, and caused an accumulation of C compounds in leaves. This was accompanied by up-regulation of phosphoglycerate mutase and ATP synthase protein content, together with down-regulation of adenosine diphosphate glucose pyrophosphatase protein. Growth in elevated [CO2] negatively affected Rubisco and Rubisco activase protein content and induced photosynthetic down-regulation. CO2 enrichment caused a specific decrease in Rubisco content, together with decreases in the amino acid and total N content of leaves. The C labelling revealed that in flag leaves, part of the C fixed during grain filling was stored as starch and structural C compounds whereas the rest of the labelled C (mainly in the form of soluble sugars) was completely respired 48 h after the end of labelling. Although labelled C was not detected in the delta C-13 of ear total organic matter and respired CO2, soluble sugar delta C-13 revealed that a small amount of labelled C reached the ear. The (CO2)-C-12 labelling suggests that during the beginning of post-anthesis the ear did not contribute towards overcoming flag leaf carbohydrate accumulation, and this had a consequent effect on protein expression and photosynthetic acclimation.
机译：在田间种植小麦植株（Triticum durum Desf。，cv。Regallo）以研究不同的[CO2]条件（700 vs 370μmol mol（-1））对生长期间光合性能和碳管理的影响。花后时期。目的是测试水槽器官利用光合产物的能力受限是否会导致二氧化碳浓度升高时光合能力的丧失。空气CO2的环境C-13 / C-12同位素组成（δC-13）在7至14日之间从环境[CO2]中的每千-10.2份更改为在升高的[CO2]下的千分之-23.6。花后几天，研究叶和穗之间的C同化和分配。升高的[CO2]对生物量的产生和籽粒的填充没有显着影响，并导致叶片中C化合物的积累。这伴随着磷酸甘油酸突变酶和ATP合酶蛋白含量的上调，以及腺苷二磷酸葡萄糖焦磷酸酶蛋白的下调。 [CO2]浓度升高对Rubisco和Rubisco活化酶蛋白含量产生负面影响，并诱导光合作用下调。 CO2的富集引起Rubisco含量的特定降低，以及氨基酸和叶片总N含量的降低。 C标记表明，在旗叶中，谷物灌浆过程中固定的C的一部分以淀粉和C的结构化合物形式存储，而其余标记的C（主要以可溶性糖形式）在C结束后48小时被完全吸入。标签。尽管在耳朵的总有机物和呼吸的二氧化碳的增量C-13中未检测到标记的C，但是可溶性糖增量C-13揭示了少量的标记C到达了耳朵。 （CO2）-C-12标记表明，在花后期开始时，耳朵对克服旗叶碳水化合物的积累没有贡献，因此对蛋白质表达和光合适应具有影响。

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