Antagonistic interactions between cytokinin and gibberellin during initial stem growth and leaf structure of royal poinciana [Delonix regia (Bojer ex. Hook.) Raf.]

IF 2.1 3区农林科学 Q2 FORESTRY

Trees Pub Date : 2024-08-27 DOI:10.1007/s00468-024-02562-1

Bárbara Oliveira Medeiros, Lázara Aline Simões Silva, Suellen Nunes Sarmento, Diuly Alves Rosa, Lília Cristina de Souza Barbosa, Mariana Machado, Helena Gioppato, Marcelo Carnier Dornelas, Vinícius Coelho Kuster, Diego Ismael Rocha

{"title":"Antagonistic interactions between cytokinin and gibberellin during initial stem growth and leaf structure of royal poinciana [Delonix regia (Bojer ex. Hook.) Raf.]","authors":"Bárbara Oliveira Medeiros, Lázara Aline Simões Silva, Suellen Nunes Sarmento, Diuly Alves Rosa, Lília Cristina de Souza Barbosa, Mariana Machado, Helena Gioppato, Marcelo Carnier Dornelas, Vinícius Coelho Kuster, Diego Ismael Rocha","doi":"10.1007/s00468-024-02562-1","DOIUrl":null,"url":null,"abstract":"<div><p>Gibberellin (GA) and cytokinin (CK) signaling play antagonistic roles in leaf development and secondary plant growth. In the current study, we investigated the effects of changes in the balance of CKs and GAs on the development and leaf and stem morpho-anatomy of <i>Delonix regia</i> (Bojer ex. Hook.) Raf. seedlings. The balance of CKs and GAs was modified by the exogenous application of plant growth regulators (PGRs), individually or in combination. After 30 days of daily PGR applications, the growth and the morpho-anatomy of the leaf and stem were assessed. CKs and GAs have antagonistic effects on the development of <i>D. regia</i>. Seedlings treated with GA showed a significant increase in height, while the application of CK led to greater formation of axillary shoots, altering the architecture of the plants. GA inhibited almost all CK responses, although a negative reciprocal interaction was observed in some growth parameters. The treatments in which GA was applied showed an increase in leaf length. However, these plants presented a reduction in leaf tissue thickness and the stem cambial band. In contrast, plants treated with CK and paclobutrazol had thicker leaf blades and more prominent radial growth of the stem, with a higher proportion of secondary xylem. Our results suggest a mutual antagonistic interaction between GA and CK in <i>D. regia</i> and contribute to understanding how the balance between these two classes of phytohormones modulates the structure and development of plant lateral organs.</p></div>","PeriodicalId":805,"journal":{"name":"Trees","volume":"38 6","pages":"1415 - 1427"},"PeriodicalIF":2.1000,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Trees","FirstCategoryId":"2","ListUrlMain":"https://link.springer.com/article/10.1007/s00468-024-02562-1","RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"FORESTRY","Score":null,"Total":0}

引用次数: 0

Abstract

Gibberellin (GA) and cytokinin (CK) signaling play antagonistic roles in leaf development and secondary plant growth. In the current study, we investigated the effects of changes in the balance of CKs and GAs on the development and leaf and stem morpho-anatomy of Delonix regia (Bojer ex. Hook.) Raf. seedlings. The balance of CKs and GAs was modified by the exogenous application of plant growth regulators (PGRs), individually or in combination. After 30 days of daily PGR applications, the growth and the morpho-anatomy of the leaf and stem were assessed. CKs and GAs have antagonistic effects on the development of D. regia. Seedlings treated with GA showed a significant increase in height, while the application of CK led to greater formation of axillary shoots, altering the architecture of the plants. GA inhibited almost all CK responses, although a negative reciprocal interaction was observed in some growth parameters. The treatments in which GA was applied showed an increase in leaf length. However, these plants presented a reduction in leaf tissue thickness and the stem cambial band. In contrast, plants treated with CK and paclobutrazol had thicker leaf blades and more prominent radial growth of the stem, with a higher proportion of secondary xylem. Our results suggest a mutual antagonistic interaction between GA and CK in D. regia and contribute to understanding how the balance between these two classes of phytohormones modulates the structure and development of plant lateral organs.

Abstract Image

查看原文本刊更多论文

细胞分裂素和赤霉素在皇家龙血树[Delonix regia (Bojer ex. Hook.) Raf.]初期茎干生长和叶片结构中的拮抗相互作用

赤霉素（GA）和细胞分裂素（CK）信号在叶片发育和植物次生生长中起着拮抗作用。在本研究中，我们研究了 CKs 和 GAs 的平衡变化对 Delonix regia (Bojer ex. Hook.) Raf.幼苗的发育、叶片和茎的形态解剖学的影响。单独或联合施用外源植物生长调节剂（PGRs）可改变 CKs 和 GAs 的平衡。每天施用 PGR 30 天后，对叶片和茎的生长和形态解剖进行评估。CKs 和 GA 对 D. regia 的生长具有拮抗作用。用 GA 处理的幼苗高度显著增加，而施用 CK 会导致腋芽的形成增加，从而改变植株的结构。GA 几乎抑制了所有的 CK 反应，但在某些生长参数中观察到了负相关的相互作用。施用 GA 的处理显示叶片长度增加。不过，这些植物的叶组织厚度和茎蔓带都有所减少。相反，用 CK 和 paclobutrazol 处理的植物叶片更厚，茎的径向生长更突出，次生木质部的比例更高。我们的研究结果表明，在雷公藤中 GA 和 CK 之间存在相互拮抗的作用，有助于理解这两类植物激素之间的平衡如何调节植物侧生器官的结构和发育。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Trees 农林科学-林学

CiteScore

4.50

自引率

4.30%

发文量

113

审稿时长

3.8 months

期刊介绍： Trees - Structure and Function publishes original articles on the physiology, biochemistry, functional anatomy, structure and ecology of trees and other woody plants. Also presented are articles concerned with pathology and technological problems, when they contribute to the basic understanding of structure and function of trees. In addition to original articles and short communications, the journal publishes reviews on selected topics concerning the structure and function of trees.