Shortage of storage carbohydrates mainly determines seed abscission in Torreya grandis ‘Merrillii’

IF 5.7 1区农林科学 Q1 HORTICULTURE

Horticultural Plant Journal Pub Date : 2024-08-17 DOI:10.1016/j.hpj.2023.10.007

Tao Liu, Xiaolong Zhao, Guangxia Zhu, Caoliang Jin, Jingwei Yan, Jinwei Suo, Weiwu Yu, Yuanyuan Hu, Jiasheng Wu

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引用次数: 0

Abstract

cv. Merrillii is a well-known nut in South China with high nutritional value. Severe premature seed abscission limits the industrial development of by causing serious economic losses. However, the physiological mechanisms of seed abscission in remain poorly understood. To gain insight into the relationships between carbohydrate status and seed abscission, three-year-old seed-bearing branches were taken as representative materials for the entire tree. Furthermore, the time course of changes in the photosynthetic rate and the non-structural carbohydrate (NSC) dynamics were monitored in the main sources (the one-year-old and two-year-old shoots), and the dry weight and NSC levels of sinks (the seeds, current female cone cluster, and current vegetative cluster) across all seed development stages were recorded. The cumulative seed abscission rate significantly increased, reaching 91.5% from 0 to 72 days after seed protrusion time (SPT). NSC levels in the main sources significantly decreased by 56%–79%, accompanied by a significantly increased photosynthesis rate of 17.1%–49.1% during that period and increased NSC levels in the three sinks. The gene expression level of cell wall invertase () was significantly correlated with sucrose, fructose, and glucose levels. The carbon storage capacity of the main sources significantly decreased from 6.03 to 3.14 mmol C · d, with a stable photosynthetic capacity, from 0 to 72 days after SPT, whereas the carbon demand of the three sinks showed a continuously increasing trend from 3.14 to 7.71 mmol C · d. In addition, sucrose supplementation significantly decreased the cumulative seed abscission rate. These results suggest that storage carbohydrates play a major role in the regulatory mechanism of seed abscission in . Our study provides a theoretical basis for improving yield through establishing a better carbon balance between sources and sinks using timely fertilization or proper pruning procedures.

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贮藏碳水化合物的短缺是导致大香榧'Merrillii'种子脱落的主要原因

cv.梅里利是华南地区著名的坚果，具有很高的营养价值。严重的种子早脱限制了其产业发展，造成了严重的经济损失。然而，人们对种子脱落的生理机制仍然知之甚少。为了深入了解碳水化合物状态与种子脱落之间的关系，我们选取了三年生的含种枝条作为整棵树的代表材料。此外，还监测了主要来源（1 年生和 2 年生枝条）的光合速率和非结构性碳水化合物（NSC）动态变化的时间过程，并记录了种子各发育阶段的吸收汇（种子、当前雌果簇和当前植株簇）的干重和 NSC 水平。种子的累积脱落率显著增加，从种子萌发时间（SPT）后 0 天到 72 天达到 91.5%。在此期间，主要来源中的 NSC 含量明显减少了 56%-79%，同时光合作用率明显增加了 17.1%-49.1%，三个吸收汇中的 NSC 含量也有所增加。细胞壁转化酶（）的基因表达水平与蔗糖、果糖和葡萄糖水平显著相关。从 SPT 后的 0 到 72 天，主要碳源的碳储存能力从 6.03 mmol C - d 显著下降到 3.14 mmol C - d，光合作用能力保持稳定，而三个碳汇的碳需求量呈持续上升趋势，从 3.14 mmol C - d 上升到 7.71 mmol C - d。这些结果表明，贮藏碳水化合物在水稻种子脱落的调节机制中起着重要作用。我们的研究为通过适时施肥或适当的修剪程序在源和汇之间建立更好的碳平衡来提高产量提供了理论依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Horticultural Plant Journal Environmental Science-Ecology

CiteScore

9.60

自引率

14.00%

发文量

293

审稿时长

33 weeks

期刊介绍： Horticultural Plant Journal (HPJ) is an OPEN ACCESS international journal. HPJ publishes research related to all horticultural plants, including fruits, vegetables, ornamental plants, tea plants, and medicinal plants, etc. The journal covers all aspects of horticultural crop sciences, including germplasm resources, genetics and breeding, tillage and cultivation, physiology and biochemistry, ecology, genomics, biotechnology, plant protection, postharvest processing, etc. Article types include Original research papers, Reviews, and Short communications.

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