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Effect of seed size on germination in three species from arid Arabian deserts

Publication: Botany
8 October 2020

Abstract

In many species, seeds with different sizes show diverse responses in their requirements for temperature and light for optimal germination. In this study, the effect of seed size (i.e., small and large) on germination was tested in seeds of Brassica tournefortii Gouan, Lotus garcinii DC., and Salvadora persica L. from arid Arabian Desert habitats. The mean seed size of all three study species differs significantly between small and large-sized seeds. Differences were observed in seed germination between large and small seeds of B. tournefortii and L. garcinii. We found that the large seeds of B. tournefortii and L. garcinii showed a higher germination percentage at all tested temperatures than that displayed by the small seeds. However, both small and large seeds of S. persica germinated equally (100%) well under all tested incubation conditions. Our results show significant differences in germination percentage between the small and large seeds of B. tournefortii at 25/35 °C under a 12 h light regime. However, seeds of L. garcinii showed a significant difference in germination percentage at low temperatures (15/25 °C) under a 12 h light regime.

Résumé

Chez de nombreuses espèces, les graines de différentes tailles présentent des exigences de température et de lumière variées pour germer de manière optimale. Dans cette étude, l’effet de la taille des graines (petites et grandes) sur la germination a été testé sur des graines de Brassica tournefortii Gouan, Lotus garcinii DC. et Salvadora persica L. provenant d’habitats arides du désert d’Arabie. La taille moyenne des graines de petite taille et de grande taille est significativement différente chez trois espèces étudiées. Des différences ont été observées dans la germination des graines de grande et de petite taille chez B. tournefortii et L. garcinii. Les auteurs ont constaté que les graines de grande taille de B. tournefortii et de L. garcinii présentaient une germination plus élevée à toutes les températures testées comparativement à celle des graines de petite taille. Cependant, les graines de petite et de grande taille de S. persica germaient bien (100 %) dans toutes les conditions d’incubation. Ces résultats montrent des différences significatives dans le pourcentage de germination entre les graines de petite et de grande taille chez B. tournefortii à 25/35 °C sous un régime de lumière de 12 h. Toutefois, le pourcentage de germination de L. garcinii sous un régime de lumière de 12 h à basse température (15/25 °C) est significativement différent.

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Information & Authors

Information

Published In

cover image Botany
Botany
Volume 99Number 2February 2021
Pages: 69 - 74

History

Received: 22 July 2020
Accepted: 25 September 2020
Accepted manuscript online: 8 October 2020
Version of record online: 8 October 2020

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Key Words

  1. arid desert
  2. Brassica tournefortii
  3. germination
  4. Lotus garcinii
  5. Salvadora persica
  6. seed size
  7. temperature

Mots-clés

  1. désert aride
  2. Brassica tournefortii
  3. germination
  4. Lotus garcinii
  5. Salvadora persica
  6. taille des graines
  7. température

Authors

Affiliations

Sanjay Gairola [email protected]
Sharjah Seed Bank and Herbarium, Sharjah Research Academy, P.O. Box 60999, Sharjah, UAE.
Tamer Mahmoud*
Sharjah Seed Bank and Herbarium, Sharjah Research Academy, P.O. Box 60999, Sharjah, UAE.
Hatem A. Shabana*
Sharjah Seed Bank and Herbarium, Sharjah Research Academy, P.O. Box 60999, Sharjah, UAE.
Asma AlKetbi
Sharjah Seed Bank and Herbarium, Sharjah Research Academy, P.O. Box 60999, Sharjah, UAE.
Shyam S. Phartyal
Nalanda University, School of Ecology and Environment Studies, Rajgir, 803116, India.

Notes

*
Present address: Nature Conservation Sector, Egyptian Environmental Affairs Agency, Cairo 11728, Egypt.
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