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外源2,4-表油菜素内酯对NaHCO胁迫下黄瓜种子萌发的影响

The Effects of Exogenous 2,4-Epibrassinolide on the Germination of Cucumber Seeds under NaHCO Stress.

作者信息

Nie Wenjing, Gong Biao, Geng Bing, Wen Dan, Qiao Peng, Guo Hongen, Shi Qinghua

机构信息

Yantai Engineering Research Center for Plant Stem Cell Targeted Breeding, Shandong Institute of Sericulture, Yantai 264001, China.

Stage Key Laboratory of Crop Biology, College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an 271018, China.

出版信息

Plants (Basel). 2024 Jan 29;13(3):394. doi: 10.3390/plants13030394.

DOI:10.3390/plants13030394
PMID:38337927
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10856843/
Abstract

This investigation focused on the suppressive impact of varying NaHCO concentrations on cucumber seed germination and the ameliorative effects of 2,4-Epibrassinolide (EBR). The findings revealed a negative correlation between NaHCO concentration and cucumber seed germination, with increased NaHCO concentrations leading to a notable decline in germination. Crucially, the application of exogenous EBR significantly counteracted this inhibition, effectively enhancing germination rates and seed vigor. Exogenous EBR was observed to substantially elevate the activities of superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD), thereby mitigating oxidative damage triggered under NaHCO stress conditions. Additionally, EBR improved enzyme activity under alkaline stress conditions and reduced starch content in the seeds. Pertinently, EBR upregulated genes that were associated with gibberellin (GA) synthesis ( and ), and downregulated genes that were linked to abscisic acid (ABA) synthesis ( and ). This led to an elevation in GA3 concentration and a reduction in ABA concentration within the cucumber seeds. Therefore, this study elucidates that alleviating oxidative stress, promoting starch catabolism, and regulating the GA and ABA balance are key mechanisms through which exogenous EBR mitigates the suppression of cucumber seed germination resulting from alkaline stress.

摘要

本研究聚焦于不同浓度碳酸氢钠（NaHCO）对黄瓜种子萌发的抑制作用以及2,4-表油菜素内酯（EBR）的缓解效应。研究结果显示，NaHCO浓度与黄瓜种子萌发呈负相关，随着NaHCO浓度升高，发芽率显著下降。至关重要的是，外源EBR的施用显著抵消了这种抑制作用，有效提高了发芽率和种子活力。观察发现，外源EBR能大幅提高超氧化物歧化酶（SOD）、过氧化氢酶（CAT）和过氧化物酶（POD）的活性，从而减轻NaHCO胁迫条件下引发的氧化损伤。此外，EBR在碱性胁迫条件下提高了酶活性，并降低了种子中的淀粉含量。相关地，EBR上调了与赤霉素（GA）合成相关的基因（和），并下调了与脱落酸（ABA）合成相关的基因（和）。这导致黄瓜种子内GA3浓度升高，ABA浓度降低。因此，本研究阐明，减轻氧化应激、促进淀粉分解代谢以及调节GA和ABA平衡是外源EBR缓解碱性胁迫对黄瓜种子萌发抑制作用的关键机制。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ea1/10856843/fa7ba7ac14ab/plants-13-00394-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ea1/10856843/708dcd4782cf/plants-13-00394-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ea1/10856843/18ca930be853/plants-13-00394-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ea1/10856843/54b9c10e25d3/plants-13-00394-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ea1/10856843/404d3389ea2d/plants-13-00394-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ea1/10856843/e264243d6143/plants-13-00394-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ea1/10856843/bf6c547404ce/plants-13-00394-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ea1/10856843/21a575fac266/plants-13-00394-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ea1/10856843/03a324a01f67/plants-13-00394-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ea1/10856843/e11bb46dca5b/plants-13-00394-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ea1/10856843/fa7ba7ac14ab/plants-13-00394-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ea1/10856843/708dcd4782cf/plants-13-00394-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ea1/10856843/18ca930be853/plants-13-00394-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ea1/10856843/54b9c10e25d3/plants-13-00394-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ea1/10856843/404d3389ea2d/plants-13-00394-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ea1/10856843/e264243d6143/plants-13-00394-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ea1/10856843/bf6c547404ce/plants-13-00394-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ea1/10856843/21a575fac266/plants-13-00394-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ea1/10856843/03a324a01f67/plants-13-00394-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ea1/10856843/e11bb46dca5b/plants-13-00394-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6ea1/10856843/fa7ba7ac14ab/plants-13-00394-g010.jpg

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