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Seed dormancy and longevity variability of Hirschfeldia incana L. during storage

Published online by Cambridge University Press:  09 May 2019

Sara Mira Open the ORCID record for Sara Mira [Opens in a new window] ,
Luciana Veiga-Barbosa  and
Félix Pérez-García
Sara Mira*
Affiliation:
Departamento de Biotecnología-Biología Vegetal, Escuela Técnica Superior de Ingeniería Agronómica, Alimentaria y de Biosistemas, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain
Luciana Veiga-Barbosa
Affiliation:
Departamento de Biologia Geral, Universidade Federal da Bahia, 40170-290, Salvador, Bahia, Brazil
Félix Pérez-García
Affiliation:
Departamento de Biotecnología-Biología Vegetal, Escuela Técnica Superior de Ingeniería Agronómica, Alimentaria y de Biosistemas, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain
*
Author for correspondence: Sara Mira, Email: [email protected]
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Abstract

We studied the variability of germination, dormancy and viability loss of Hirschfeldia incana seeds in relation to seed size. Seeds were stored at 35°C under humid [75% relative humidity (RH)] or dry (33% RH) conditions. Seed germination and electrolyte leakage were evaluated periodically. Small seeds had lower longevity at humid or dry storage conditions (5 or 407 days, respectively) than large or intermediate seeds (7–9 or 536–727 days, respectively). Moreover, H. incana shows variability in seed dormancy related to seed size within a population, with small seeds having lower dormancy (13%) than intermediate (50%) or large seeds (72%). Dormancy was partially released after a short storage at 35°C and humid conditions. Under dry storage conditions, endogenous dormancy cycles were observed for over a year, and longer times of storage had a dormancy-breaking effect through dry after-ripening. Results suggest a dual strategy producing non-dormant seeds with low longevity that will germinate immediately after dispersal, and seeds with greater longevity that will delay germination. Membrane permeability increased linearly with ageing at both humid and dry storage (R2 = 0.60). Small seeds showed greater conductivity than intermediate or large seeds (0.7, 0.4 or 0.3 mS g–1 dry weight, respectively, at the 80% germination). The conductivity test could be used to evaluate the quality of H. incana seeds and would allow us to identify dormant (non-germinating) seed lots as viable. However, the influence of storage conditions and variability within a seed population on seed longevity should be taken into account when evaluating seed quality.

Keywords

Hirschfeldia incanaseed ageingseed dormancyseed heterogeneityseed storage
Type
Research Paper
Information
Seed Science Research , Volume 29 , Issue 2 , June 2019 , pp. 97 - 103
Copyright
Copyright © Cambridge University Press 2019 

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