Heteromorphic seeds of wheat wild relatives show germination niche differentiation.
Aegilops
antioxidants
controlled ageing test
functional traits
seed dimorphism
seed germination
seed longevity
Journal
Plant biology (Stuttgart, Germany)
ISSN: 1438-8677
Titre abrégé: Plant Biol (Stuttg)
Pays: England
ID NLM: 101148926
Informations de publication
Date de publication:
Mar 2020
Mar 2020
Historique:
received:
06
08
2019
accepted:
12
10
2019
pubmed:
23
10
2019
medline:
12
3
2020
entrez:
23
10
2019
Statut:
ppublish
Résumé
Crop wild relatives are fundamental genetic resources for crop improvement. Wheat wild relatives often produce heteromorphic seeds that differ in morphological and physiological traits. Several Aegilops and Triticum species possess, within the same spikelet, a dimorphic seed pair, with one seed being larger than the other. A comprehensive analysis is needed to understand which traits are involved in seed dimorphism and if these aspects of variation in dimorphic pairs are functionally related. To this end, dispersal units of Triticum urartu and five Aegilops species were X-rayed and the different seed morphs weighed. Germination tests were carried out on seeds, both dehulled and left in their dispersal units. Controlled ageing tests were performed to detect differences in seed longevity among seed morphs, and the antioxidant profile was assessed in terms of antioxidant compounds equipment and expression of selected antioxidant genes. We used PCA to group seed morphs sharing similar patterns of germination traits, longevity estimates and antioxidant profile. Different seed morphs differed significantly in terms of mass, final germination, germination timing, longevity estimates and antioxidant profile in most of the tested species. Small seeds germinated slower, had lower germination when left in their dispersal units, a higher antioxidant potential and were longer-lived than large seeds. The antioxidant gene expression varied between morphs, with different patterns across species but not clearly reflecting the phenotypic observations. The results highlight different trait trade-offs in dimorphic seeds of Aegilops and T. urartu, affecting their germination phenology and longevity, thereby resulting in recruitment niche differentiation.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
191-202Subventions
Organisme : CARIPLO Foundation
ID : 2016-0723
Organisme : Italian Ministry of Education, University and Research
Informations de copyright
© 2019 German Society for Plant Sciences and The Royal Botanical Society of the Netherlands.
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