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A Comparative study of germination strategies of two species of genus Allium sect. Allium

Germination experiments were performed with seeds of two species of genus Allium section Allium, a rare and endangered species A. pyrenaicum and a common A. sphaerocephalon. Different pre-treatments and a photoperiod of 24 h darkness were applied in order to simulate different germination conditions. Both species showed a high percentage of viable seeds a part of which were dormant. An elevate percentage of dormant seeds could be caused by a later collection time. Low altitude populations had more mortality than the others, possibly caused by the hard summer conditions during flowering and fruiting time. Comparisons between dates of species coexistence localities only show inter-population variability and it could be caused by the detected dormancy. Darkness accelerates germination, possibly for elongation radicle stimulation. Heat-shock pre-treatments decreased germination time in seeds from localities where fire is a probable event. The rarity of A. Pyrenaicum not seems to be caused by restricted germination requirements but is attributable to distinct habitat preferences, related to his altitudinal range of distribution

Other contributions: Universitat de Girona. Institut de Medi Ambient
Universitat de Girona. Facultat de Ciències
Author: Gifre Alonso, M. Cristina
Font Garcia, Joan
Abstract: Germination experiments were performed with seeds of two species of genus Allium section Allium, a rare and endangered species A. pyrenaicum and a common A. sphaerocephalon. Different pre-treatments and a photoperiod of 24 h darkness were applied in order to simulate different germination conditions. Both species showed a high percentage of viable seeds a part of which were dormant. An elevate percentage of dormant seeds could be caused by a later collection time. Low altitude populations had more mortality than the others, possibly caused by the hard summer conditions during flowering and fruiting time. Comparisons between dates of species coexistence localities only show inter-population variability and it could be caused by the detected dormancy. Darkness accelerates germination, possibly for elongation radicle stimulation. Heat-shock pre-treatments decreased germination time in seeds from localities where fire is a probable event. The rarity of A. Pyrenaicum not seems to be caused by restricted germination requirements but is attributable to distinct habitat preferences, related to his altitudinal range of distribution
Document access: http://hdl.handle.net/2072/42407
Language: eng
Rights: Aquest document est√† subjecte a una llic√®ncia Creative Commons: Reconeixement ‚Äď No comercial ‚Äď Sense obra derivada (by-nc-nd)
Rights URI: http://creativecommons.org/licenses/by-nc-nd/3.0/es/deed.ca
Subject: Allium (Catalunya)
Germinació -- Experiments
Llavors -- Experiments
Germination -- Experiments
Seeds -- Experiments
Title: A Comparative study of germination strategies of two species of genus Allium sect. Allium
Type: info:eu-repo/semantics/masterThesis
Repository: Recercat

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