Use of stored carbon for new organ development in apple saplings in early spring for two consecutive years after 13C labelling.

IF 5.4 2区 生物学 Q1 PLANT SCIENCES Physiologia plantarum Pub Date : 2025-01-01 DOI:10.1111/ppl.70077
Shogo Imada, Yasuhiro Tako
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Abstract

The use of stored carbon is essential for new organ development in deciduous trees during early spring. However, the contribution of carbon to the development of new organs in early spring of subsequent years is not well understood. Using a 13C labelling approach, we investigated the reallocation of assimilated carbon into new aboveground organs on apple (Malus domestica) saplings in the following two years. Eight three-year-old potted saplings were exposed to 13CO2 in an exposure chamber on each of eight different dates during the growth season. Some of the trees were harvested in the late autumn of the same year. The remaining trees were transferred to a field and cultivated during the two following growing seasons. We directly showed that the assimilated 13C was used to develop terminal and flower buds for two consecutive years after labelling. The proportions of the concentration of 13C remobilized to the terminal and flower buds in the second year were 5 and 24% of those in the first year after labelling, respectively. The concentration of assimilated 13C was higher in the terminal buds than in the flower buds in the first year after the labelling, while opposite results were found in the second year. This study demonstrates that the stored carbon used for the development of new organs was a mixture of recent- and old-stored carbon and indicates that recently-stored carbon was preferentially used to develop new organs. We also indicated that the stored carbon was remobilized to flower buds during development.

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13C标记后连续两年苹果幼树早春贮藏碳对新器官发育的影响。
初春落叶乔木新器官的发育离不开碳的利用。然而,碳对随后几年早春新器官发育的贡献尚不清楚。采用13C标记法,研究了苹果(Malus domestica)幼树2年内同化碳在地上新器官中的再分配情况。在生长季节的8个不同日期,8棵3岁的盆栽树苗在一个暴露室中暴露在13CO2中。有些树是在同年的深秋收获的。剩下的树被转移到田地里,在接下来的两个生长季节里耕种。我们直接证明了同化后的13C在标记后连续两年用于顶芽和花蕾的发育。标记后第二年13C浓度再迁移到顶芽和花蕾的比例分别为第一年的5%和24%。标记后第一年,顶芽中同化13C浓度高于花芽,第二年则相反。该研究表明,用于新器官发育的储存碳是新储存碳和旧储存碳的混合物,并表明新储存碳优先用于发展新器官。我们还指出,储存的碳在发育过程中被重新激活到花蕾中。
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来源期刊
Physiologia plantarum
Physiologia plantarum 生物-植物科学
CiteScore
11.00
自引率
3.10%
发文量
224
审稿时长
3.9 months
期刊介绍: Physiologia Plantarum is an international journal committed to publishing the best full-length original research papers that advance our understanding of primary mechanisms of plant development, growth and productivity as well as plant interactions with the biotic and abiotic environment. All organisational levels of experimental plant biology – from molecular and cell biology, biochemistry and biophysics to ecophysiology and global change biology – fall within the scope of the journal. The content is distributed between 5 main subject areas supervised by Subject Editors specialised in the respective domain: (1) biochemistry and metabolism, (2) ecophysiology, stress and adaptation, (3) uptake, transport and assimilation, (4) development, growth and differentiation, (5) photobiology and photosynthesis.
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