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Reliable Method for Assessing Seed Germination, Dormancy, and Mortality under Field Conditions

Reliable Method for Assessing Seed Germination, Dormancy, and Mortality under Field Conditions

Published on: November 6, 2016

Drying banana seeds for ex situ conservation.

Simon Kallow¹, Manuela Garcia Zuluaga², Natalia Fanega Sleziak²

¹Royal Botanic Gardens Kew, Millennium Seed Bank, Wakehurst, Ardingly, Sussex, RH17 6TN, UK.

Conservation Physiology

|May 2, 2022

Summary

Mature banana wild relative seeds are desiccation tolerant for genebanking. Immature seeds, however, show reduced embryo tolerance to drying, impacting conservation strategies.

Keywords:

Crop wild relatives desiccation tolerance genebank genetic resources

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Area of Science:

Plant biology
Seed science
Conservation genetics

Background:

Ex situ seed conservation relies on seeds' ability to withstand drying.
Drying responses are poorly understood for many wild species, including crop wild relatives like Musa species.

Purpose of the Study:

To investigate the drying responses of Musa acuminata and Musa balbisiana seeds.
To determine the desiccation tolerance of mature versus immature seeds for genebanking.

Main Methods:

Seeds were equilibrated to various relative humidity (RH) levels.
Viability was assessed using embryo rescue, tetrazolium staining, and germination tests.
Embryo shrinkage was measured using X-ray computed tomography.

Main Results:

Mature seeds retained viability when dried to 4% equilibrium relative humidity (eRH).
Immature seeds exhibited negligible viability and significant embryo shrinkage upon drying.
Seeds from unripe fruit lost viability when dried, especially at faster rates.

Conclusions:

Mature Musa seeds are desiccation-tolerant for genebanking purposes.
Immature seeds possess less robust embryos, limiting their ability to withstand desiccation.
Understanding these differences is crucial for effective wild banana seed conservation.