钾通过增加碳流刺激柑橘果实糖分积累

IF 8.7 1区 农林科学 Q1 Agricultural and Biological Sciences Horticulture Research Pub Date : 2024-09-09 DOI:10.1093/hr/uhae240
Kongjie Wu, Chengxiao Hu, Peiyu Liao, Yinlong Hu, Xuecheng Sun, Qiling Tan, Zhiyong Pan, Shoujun Xu, Zhihao Dong, Songwei Wu
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引用次数: 0

摘要

可溶性糖有助于柑橘类水果的口感和风味。钾(K)是众所周知的优质元素,在改善糖分积累和果实品质方面发挥着关键作用,但其机理在很大程度上还不清楚。本研究旨在阐明钾是如何通过调节纽荷尔脐橙从源叶到果实的碳流而改善糖分积累的。我们发现,果实中 1.5% 左右的最佳钾浓度能改善柑橘的糖分积累和果实品质。果实和叶片中蔗糖(Suc)代谢所涉及的果实生长速率、酶活性和关键基因的表达水平都有所提高,这表明施用钾提高了吸收汇和源的强度。果实中 13C- Suc 含量的提高也证实了施钾也促进了 Suc 从源叶片向果实的运输。此外,我们还发现,脐橙利用交联通路将蔗糖从源叶运输到果实,而施用钾能增强交联负载,叶片中 CF 信号的增强和质膜密度的增加证明了这一点。研究结果表明,在纽荷尔脐橙中,钾通过增加从源叶到果实的碳流量来刺激果实糖分积累。
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Potassium stimulates fruit sugar accumulation by increasing carbon flow in Citrus sinensis
Soluble sugars contribute to the taste and flavor of citrus fruit. Potassium (K), known as a quality element, plays key roles in improving sugar accumulation and fruit quality, but the mechanism is largely unknown. This study aims to elucidate how K improves sugar accumulation by regulating carbon flow from source leaves to fruit in Newhall navel orange. We found that optimal fruit K concentrations around 1.5% improved sugar accumulation and fruit quality in citrus. K application increased the strength of both sink and source, as indicated by the increased fruit growth rate, enzymes activities and expression levels of key genes involved in sucrose (Suc) metabolism in fruit and leaf. K application also facilitated Suc transport from source leaves to fruit, as confirmed by the enhanced 13C-Suc level in fruit. Furthermore, we found that navel orange used symplastic pathway for transporting Suc from source leaves to fruits, and K application enhanced symplastic loading, as demonstrated by the intensified CF signal and increased plasmodesmata density in leaves. The findings reveal that K stimulates fruit sugar accumulation by increasing carbon flow from source leaves to fruit in Newhall navel orange.
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来源期刊
Horticulture Research
Horticulture Research Biochemistry, Genetics and Molecular Biology-Biochemistry
CiteScore
11.20
自引率
6.90%
发文量
367
审稿时长
20 weeks
期刊介绍: Horticulture Research, an open access journal affiliated with Nanjing Agricultural University, has achieved the prestigious ranking of number one in the Horticulture category of the Journal Citation Reports ™ from Clarivate, 2022. As a leading publication in the field, the journal is dedicated to disseminating original research articles, comprehensive reviews, insightful perspectives, thought-provoking comments, and valuable correspondence articles and letters to the editor. Its scope encompasses all vital aspects of horticultural plants and disciplines, such as biotechnology, breeding, cellular and molecular biology, evolution, genetics, inter-species interactions, physiology, and the origination and domestication of crops.
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