VEGETOS: An International Journal of Plant Research & Biotechnology
(Society For Plant Research)

Research Articles

A SOCIETY FOR PLANT RESEARCH PUBLICATION


Volume: 33, Issue: 1, March 2020


Print ISSN : 0970-4078.
Online ISSN : 2229-4473.
Website:www.vegetosindia.org
Pub Email: contact@vegetosindia.org
Page Visits: 52

Doi: 10.1007/s42535-019-00091-8
Doi Link: https://doi.org/10.1007/s42535-019-00091-8
First Page: 135
Last Page: 144
Published: 03 January, 2020

Somatic embryogenesis induced from vascular tissues in leaf explants of Lisianthus (Eustoma grandiflorum (Raf.) Shinn) generates true-to-type diploid plants


Abstract:

This study aimed to propose a somatic embryogenesis protocol for lisianthus (Eustoma grandiflorum) using leaf explants, as well as to characterize the cytological alterations involved in the regeneration process and ploidy fidelity of regenerated plants. The explants showed responsiveness and induced formation of pro-embryogenic structures in medium supplemented with 2,4-dichlorophenoxyacetic acid (2,4-D), reaching 100% of induction frequency at the concentrations of 10 and 20 µM. Somatic embryos differentiation occurred in both tested treatments: 6-benzyladenine (BA) and meta-Topolin (mT). The use of auxin and cytokinins on the somatic embryogenesis induction step generated true-to-type regenerants, maintaining the same ploidy levels. The plants obtained from both the differentiation of the somatic embryos and from seeds showed an average DNA amount of 3.53 pg, with and coefficient of variation of 2.9%, confirming that the regenerating plants are diploid (2n). Anatomical studies showed that the origin of somatic embryos is associated with the intense divisions of the vascular parenchyma. After transfer the somatic embryos to the differentiation and maturation media, there was an asynchronous germination and regeneration of in vitro lisianthus plants, with the best maturation occurred with 2 µM BA; 2 or 4 µM mT. This study opens new perspectives for somatic embryogenesis of lisianthus, so as to optimize the in vitro regeneration systems used in genetic breeding programs for this ornamental species.

Vegetos

Keywords:


Eustoma sp., Flow cytometry, Gentianaceae, Ornamental plant, Procambium


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Acknowledgements :



Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG—Belo Horizonte, MG), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq—Brasília, DF) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES—Brasília, DF) are acknowledged for the financial support. The Laboratories of Microscopy and Microanalysis (NMM/UFV) and Plant Anatomy—Plant Biology Department /UFV for the facilities and support to the anatomical analyses, and to the Genetics and Biotechnology Laboratory Federal University of Juiz de Fora for the flow cytometry analysis.


Author Information:



Maria Yumbla-Orbes
Departamento de Fitotecnia, Universidade Federal de Viçosa, Viçosa, Brazil




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