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Germination responses in Zephyranthes tubispatha seeds exposed to different thermal conditions and the role of antioxidant metabolism and several phytohormones in their control

Published online by Cambridge University Press:  02 November 2022

María Cecilia Acosta ,
Vilma Teresa Manfreda ,
María Luciana Alcaraz ,
Sergio Alemano  and
Humberto Fabio Causin Open the ORCID record for Humberto Fabio Causin [Opens in a new window]
María Cecilia Acosta
Affiliation:
Facultad de Agronomía, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), República Italia 780, 7300 Azul, Buenos Aires, Argentina
Vilma Teresa Manfreda
Affiliation:
Facultad de Agronomía, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), República Italia 780, 7300 Azul, Buenos Aires, Argentina
María Luciana Alcaraz
Affiliation:
Facultad de Agronomía, Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA), República Italia 780, 7300 Azul, Buenos Aires, Argentina
Sergio Alemano
Affiliation:
Laboratorio de Fisiología Vegetal, Departamento de Ciencias Naturales, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, UNRC, Instituto de Investigaciones Agrobiotecnológicas-Consejo Nacional de Investigaciones Científicas y Técnicas (INIAB-CONICET), 5800 Río Cuarto, Córdoba, Argentina
Humberto Fabio Causin*
Affiliation:
Instituto de Biodiversidad y Biología Experimental (IBBEA), CONICET-UBA, Departamento de Biodiversidad y Biologia Experimental (DBBE), F.C.E.N., Universidad de Buenos Aires, Ciudad Universitaria, Pab. II, C.A.B.A. C1428EGA, Argentina
*
*Author for Correspondence: Humberto Fabio Causin, E-mail: ssvhfc@gmail.com
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Abstract

Zephyranthes tubispatha is an ornamental species distributed along several countries of South America. Although it can be multiplied through bulbs or scales, seed germination is a simpler and more cost-effective process. Temperature plays a major role in the control of germination; however, its effect has been scarcely investigated in this species. In the present work, we characterized the germination responses of Z. tubispatha seeds to different temperatures and analyzed the role of key components of the antioxidant metabolism and phytohormones in their control. Seeds showed an optimal temperature range for germination between 14 and 20°C, with higher temperatures (HTs) being progressively inhibitory. While germination was almost nil above 28°C, it could be recovered after transferring the seeds to 20°C, suggesting that thermoinhibition was the underlying phenomenon. The duration of the HT incubation period affected both the time to germination onset and the germination rate at 20°C. Similarly, the activity of antioxidant enzymes, the production of reactive oxygen species in the embryo and the sensitivity to some germination promoters varied depending on the duration of the HT treatment. The addition of 20 μM fluridone was sufficient to recover germination dynamics as in the control treatment when given after a long-term incubation period (25 d) at HT. Ethephon supply was more effective than gibberellins to suppress thermoinhibition, suggesting that changes in the balance and/or sensitivity to ethylene and abscisic acid over time play an important role in the regulation of germination responses to thermal cues in this species.

Keywords

antioxidant metabolismgerminationphytohormonesROStemperaturethermoinhibitionZephyranthes tubispatha
Type
Research Paper
Information
Seed Science Research , Volume 32 , Issue 4 , December 2022 , pp. 230 - 245
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Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press

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