The genus Aegilops belongs to the secondary gene pool of wheat and has great importance for wheat cultivar improvement. As a genus with only annual species, regeneration from seeds in Aegilops is crucial. In several species in Aegilops, spikes produce different seed morphs, both in size and germination patterns. However, little is known about the ecology of seed germination, nor about the seed longevity in this genus. Here we investigated the germination phenology of Ae. neglecta under laboratory and field conditions and assessed longevity of different seed morphs of five additional Aegilops species using controlled ageing tests. Large seeds were short-lived and germinated faster than small seeds in most of the species. Field experiments with Ae. neglecta showed that large seeds of the dimorphic pair germinated 3 months after dispersal in contrast to 14 months for smaller seeds. Differences in longevity were detected not only in dimorphic seed pairs, but also among seeds from different positions on the spike. Our results indicate that different longevities in seed morphs of Aegilops may reflect a different soil seed bank persistence, with smaller seeds able to maintain a higher viability after dispersal than larger ones, thereby spreading seedling emergence over two years. Differences of seed germination and longevities between seed morphs in Aegilops may have important implications for ex situ seed conservation and reinforce the hypothesis of a bet-hedging strategy in the germination ecology of this genus.
Seed heteromorphy influences seed longevity in Aegilops / F. Guzzon, S. Orsenigo, M. Gianella, J.V. Müller, I. Vagge, G. Rossi, A. Mondoni. - In: SEED SCIENCE RESEARCH. - ISSN 0960-2585. - 28:4(2018), pp. 277-285.
|Titolo:||Seed heteromorphy influences seed longevity in Aegilops|
|Parole Chiave:||controlled ageing test; crop wild relatives; germination ecology; seed conservation; seed dimorphism; phenology; soil seed bank|
|Settore Scientifico Disciplinare:||Settore BIO/03 - Botanica Ambientale e Applicata|
|Data di pubblicazione:||2018|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1017/S096025851800034X|
|Appare nelle tipologie:||01 - Articolo su periodico|
File in questo prodotto:
|Guzzon et al. 2018_Seed Science and Research 28, 277-285.pdf||Publisher's version/PDF||Administrator Richiedi una copia|