Storage duration, light, temperature, and salinity exposure influence germination of the glycophyte Rhanterium epapposum

Publication: Botany
28 January 2021

Abstract

Regeneration of native species is the first priority for biodiversity conservation and restoration. To this end, it is key to have seeds properly conserved in seed banks and knowledge of seed longevity and (or) dormancy alleviation at different storage time intervals. In addition, understanding the germination response of the stored seeds to environmental conditions improves the efficiency of restoration and rehabilitation projects. We investigated the influence of storage duration (1–5 years), light (0 or 12 h of illumination), thermoperiod (night/day temperatures of 15/20 and 20/25 °C), and salinity (0, 100, 200. and 400 mmol/L of NaCl) on seed germination of Rhanterium epapposum, a glycophytic species from the Arabian Peninsula. Seeds maintained viability after five years of storage indoors at room temperature. Three years of storage alleviated seed dormancy. Exposure to 12 h light per day and thermoperiods of 15/20 °C enhanced seed germination. The seeds were glycophytic; after-ripened seeds exposed to salinity exhibited reduced rates of germination that did not recover after the salinity was alleviated.

Résumé

La régénération des espèces indigènes est une priorité pour la conservation et la restauration de la biodiversité. À cette fin, il est essentiel de disposer de semences correctement conservées dans des banques de semences et de connaître la longévité et (ou) l’atténuation de la dormance des semences à différents intervalles de temps de stockage. En outre, la compréhension de la germination des semences stockées aux conditions environnementales améliore l’efficacité des projets de restauration et de réhabilitation. Les auteurs ont étudié l’influence de la durée de stockage (1 à 5 ans), de la lumière (0 ou 12 h de lumière), de la thermopériode (températures nuit/jour de 15/20 et 20/25 °C) et de la salinité (0, 100, 200 et 400 mmol/L de NaCl) sur la germination des semences de Rhanterium epapposum, une espèce glycophytique de la péninsule arabique. Les graines conservaient leur viabilité après cinq ans de stockage à l’intérieur, à température ambiante. Trois années de stockage permettaient de réduire la dormance des semences. L’exposition à 12 heures de lumière par jour et à des thermopériodes de 15/20 °C favorisait la germination des semences. Les graines étaient glycophytiques ; les graines post-maturées exposées à la salinité présentaient une germination réduite qui ne se rétablissait pas après la diminution de la salinité. [Traduit par la Rédaction]

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Information & Authors

Information

Published In

cover image Botany
Botany
Volume 99Number 5May 2021
Pages: 261 - 267

History

Received: 12 August 2020
Accepted: 18 November 2020
Published online: 28 January 2021

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Key Words

  1. after-ripening
  2. desert
  3. glycophyte
  4. restoration

Mots-clés

  1. post-maturation
  2. désert
  3. glycophyte
  4. restauration

Authors

Affiliations

Arvind Bhatt drbhatt79@gmail.com
Lushan Botanical Garden, Chinese Academy of Science, Jiujiang, China.
María Mercedes Carón
Instituto Multidisciplinario de Biología Vegetal (IMBIV), CONICET, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Córdoba, CC 4955000, Argentina.
David Gallacher
School of Life and Environmental Sciences, The University of Sydney, Narrabri, NSW 2390, Australia.
Paulo Roberto de Moura Souza-Filho
Multidisciplinary Center of Barra, Federal University of Western Bahia, Barra, BA, Brazil.

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