细胞分裂素在深叶补血草幼苗根系限制下生物量积累中的作用

IF 1.1 Q3 HORTICULTURE Ornamental Horticulture Pub Date : 2022-12-01 DOI:10.1590/2447-536x.v28i4.2553
Esteban Gandolfo, Guido Hakim, E. Giardina, A. Benedetto
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引用次数: 0

摘要

摘要有研究认为,苗期特级切花Limonium sinuatum对不同非生物胁迫的响应可能与根尖产生的内源细胞分裂素的合成和转运有关。为了验证这一假设,本研究通过叶面喷施合成细胞分裂素(苄基氨基嘌呤,BAP)和内源细胞分裂素合成抑制剂(多巴胺)来评估细胞分裂素在L. sinuatum植物生物量积累过程中的参与作用。结果表明,喷施BAP可提高水草叶片面积的形成和扩大,通过增加植物光合能力增加生物量积累,并通过正反馈机制向茎尖分生组织进行分化分配,其最佳响应阈值接近100 mg L-1 BAP。多巴胺喷洒似乎影响内源性细胞分裂素的合成,减少了前面提到的反应。反应呈剂量依赖性,最佳剂量为100 mg L-1 BAP和200 mg L-1多巴胺。我们的研究结果表明,苗圃期根系限制等非生物胁迫过程中内源细胞分裂素的水平是该物种生物量积累过程的决定变量。
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Involvement of cytokinins in biomass accumulation of Limonium sinuatum under root restriction during nursery
Abstract It has been suggested that the response of the specialty cut flower Limonium sinuatum to different abiotic stress situations related to the plug tray cell size during nursery could be associated with the synthesis and translocation of endogenous cytokinins produced in the root tips. To validate this hypothesis, the aim of this work was to evaluate the participation of cytokinins in the process of biomass accumulation in L. sinuatum plants through foliar spraying with a synthetic cytokinin (benzyl aminopurine, BAP) and an inhibitor of the synthesis of endogenous cytokinins (dopamine). Our results indicated that spraying L. sinuatum plants with BAP increased leaf area initiation and expansion, biomass accumulation through increased plant photosynthetic capacity, and differential partitioning towards the shoot apical meristem by a positive feedback mechanism that has a threshold of optimal response close to 100 mg L-1 BAP. Dopamine spraying appeared to affect the synthesis of endogenous cytokinins, reducing the previously mentioned responses. Responses were dose-dependent, with an optimum of 100 mg L-1 BAP and 200 mg L-1 dopamine. Our results allow concluding that the level of endogenous cytokinins during the abiotic stress such as root restriction during nursery is a determining variable of the biomass accumulation process in this species.
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来源期刊
Ornamental Horticulture
Ornamental Horticulture Agricultural and Biological Sciences-Horticulture
CiteScore
2.20
自引率
14.30%
发文量
30
审稿时长
50 weeks
期刊介绍: The Journal ORNAMENTAL HORTICULTURE - OH (Revista Brasileira de Horticultura Ornamental) is an official publication of the Brazilian Society for Floriculture and Ornamental Plants (Sociedade Brasileira de Floricultura e Plantas Ornamentais) - SBFPO Short title of the journal: ORNAM. HORTIC. This Journal aim to publish technical and scientific researches in floriculture, ornamental plants, landscaping and landscapes from members of this Society and others. The manuscripts can be submitted in portuguese, but publication must be in English language (U.S.). All the manuscripts submitted to Ornamental Horticulture (Revista Brasileira de Horticultura Ornamental) - OH must not have been submitted or published at the same time, partial or totally, to other journal. It is allowed to read, download, copy, distribute, print, search, or link to parts or the full texts to use them for any other lawful purpose. The reproduction of articles published in this journal is authorized, under the condition that the source is acknowledged.
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