Phosphorus deficiency promotes root:shoot ratio and carbon accumulation via modulating sucrose utilization in maize

IF 4 3区 生物学 Q1 PLANT SCIENCES
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Abstract

Phosphorus deficiency usually promotes root:shoot ratio and sugar accumulation. However, how the allocation and utilization of carbon assimilates are regulated by phosphorus deficiency remains unclear. To understand how phosphorus deficiency affects the allocation and utilization of carbon assimilates, we systematically investigated the fixation and utilization of carbon, along with its diurnal and spatial patterns, in hydroponically grown maize seedlings under low phosphorus treatment. Under low phosphorus, sucrolytic activity was slightly inhibited by 12.0% in the root but dramatically inhibited by 38.8% in the shoot, corresponding to the promoted hexose/sucrose ratio and biomass in the root. Results point to a stable utilization of sucrose in the root facilitating competition for more assimilates, while increasing root:shoot ratio. Moreover, starch and sucrose accumulated in the leaves under low phosphorus. Spatially, starch and sucrose were oppositely distributed, starch mainly in the leaf tip, and sucrose mainly in the leaf base and sheath. Evidence of sucrose getting stuck in leaf base and sheath suggests that carbon accumulation is not attributed to carbon assimilation or export disturbance, but may be due to poor carbon utilization in the sinks. These findings improve the understanding of how low phosphorus regulates carbon allocation between shoot and root for acclimation to stress, and highlight the importance of improving carbon utilization in sinks to deal with phosphorus deficiency.

缺磷通过调节玉米的蔗糖利用率促进根:芽比和碳积累
缺磷通常会促进根:芽比和糖分积累。然而,缺磷如何调控碳同化物的分配和利用仍不清楚。为了了解缺磷如何影响碳同化物的分配和利用,我们系统地研究了低磷处理下水培玉米幼苗的碳固定和利用及其昼夜和空间模式。在低磷条件下,蔗糖分解活性在根部受到了 12.0% 的轻微抑制,但在芽部受到了 38.8% 的显著抑制,这与根部己糖/蔗糖比率和生物量的提高是相对应的。结果表明,根部对蔗糖的稳定利用促进了对更多同化物的竞争,同时提高了根与芽的比率。此外,在低磷条件下,淀粉和蔗糖在叶片中积累。在空间分布上,淀粉和蔗糖呈对立分布,淀粉主要在叶尖,而蔗糖主要在叶基部和叶鞘。蔗糖滞留在叶基部和叶鞘的证据表明,碳积累不是由于碳同化或输出干扰,而可能是由于碳汇利用率低。这些发现加深了人们对低磷如何调节芽和根之间的碳分配以适应胁迫的理解,并强调了提高碳汇中的碳利用率以应对缺磷问题的重要性。
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来源期刊
Journal of plant physiology
Journal of plant physiology 生物-植物科学
CiteScore
7.20
自引率
4.70%
发文量
196
审稿时长
32 days
期刊介绍: The Journal of Plant Physiology is a broad-spectrum journal that welcomes high-quality submissions in all major areas of plant physiology, including plant biochemistry, functional biotechnology, computational and synthetic plant biology, growth and development, photosynthesis and respiration, transport and translocation, plant-microbe interactions, biotic and abiotic stress. Studies are welcome at all levels of integration ranging from molecules and cells to organisms and their environments and are expected to use state-of-the-art methodologies. Pure gene expression studies are not within the focus of our journal. To be considered for publication, papers must significantly contribute to the mechanistic understanding of physiological processes, and not be merely descriptive, or confirmatory of previous results. We encourage the submission of papers that explore the physiology of non-model as well as accepted model species and those that bridge basic and applied research. For instance, studies on agricultural plants that show new physiological mechanisms to improve agricultural efficiency are welcome. Studies performed under uncontrolled situations (e.g. field conditions) not providing mechanistic insight will not be considered for publication. The Journal of Plant Physiology publishes several types of articles: Original Research Articles, Reviews, Perspectives Articles, and Short Communications. Reviews and Perspectives will be solicited by the Editors; unsolicited reviews are also welcome but only from authors with a strong track record in the field of the review. Original research papers comprise the majority of published contributions.
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