%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Zongo, C.
%A Sabourin, M.
%A Demaret, L.
%A Gateble, G.
%A Fogliani, B.
%A Marmey, Philippe
%T Seed characterization for propagation and conservation of Oxera pulchella subsp grandiflora (dubard) de kok, a new caledonian ornamental endemic
%D 2016
%L PAR00015592
%G ENG
%J Propagation of Ornamental Plants
%@ 1311-9109
%K Desiccation ; conservation ; royal creeper ; South Pacific
%K NOUVELLE CALEDONIE
%M ISI:000392367500004
%N 4
%P 137-145
%U https://www.documentation.ird.fr/hor/PAR00015592
%V 16
%W Horizon (IRD)
%X The Royal Creeper, Oxera pulchella subsp. grandiflora (Dubard) de Kok (Lamiaceae) is a New Caledonian threatened endemic taxon with high ornamental potential. Propagation by cuttings has till now been the main propagation method for ornamental uses. A characterization of the seed biology is required in order to promote a better development of O. pulchella subsp. grandifiora ornamental potential, through maintaining its genetic diversity and its conservation. A seed analysis was conducted to define seed structure, germination conditions, dormancy, and desiccation tolerance. Seeds were shown to be of exalbuminous type with a permeable endocarp. Seeds displayed a non-deep physiological dormancy. When desiccated by equilibration in nine atmospheres with controlled relative humidity, seeds desiccated to lower water content (2.8 +/- 0.5% of fresh weight) displayed a germination rate of 63 +/- 13% compared to non-desiccated control, indicating that Oxera pulchella subsp. grandiflora seeds were desiccation-tolerant. Protocols combining seed desiccation and low temperatures storage revealed that seeds desiccated in an atmosphere with a relative humidity of 45% and conserved at 4 degrees C were viable after one-year period storage, with a germination rate of 50%. Our study shows that a characterization of physiological traits of seeds, such as germination, dormancy and desiccation tolerance, may lead to favoring the seed as a means of propagation for ornamental uses and conservation.
%$ 076