http://www.nsl.fs.fed.us/nsl_wpsm.htmlspécifiquement
http://www.nsl.fs.fed.us/VWYZ%20genera.pdfà la page 1156-1157
However, cold
requirements among the various species appear to be
species-specific. Although seeds of many species will germinate
if sown immediately after they are extracted from
fresh fruit, a dry cold treatment of 3 to 5 °C for about 90
days may increase germination or become necessary if
seeds are allowed to dry (Ballington 1998). Gibberellic acid
(GA3 or GA4+7) treatment has been shown to promote germination.
Although GA does not increase total germination,
it reduces the hours of light necessary or in some instances
overcomes the light requirement, thus stimulating early and
uniform germination (Ballington 1998; Ballington and others
1976; Devlin and Karczmarczyk 1975; Giba and others
1993; Smagula and others 1980).
In studies to investigate the light
requirement for seed germination of lowbush blueberry,
Smagula and others (1980) found that seeds germinated in
light exhibited an increase in both germination rate and
cumulative germination in comparison to seeds germinated
in darkness. Gibberellic acid treatment enhanced germination
in the light as well as dark germination, with 1,000 ppm
(0.1%) sufficient to overcome dark inhibition. Seed germination
of highbush blueberry can be enhanced by GA3
(Dweikat and Lyrene 1988). In 4 weeks, 4% germination of
nontreated seeds was reported, whereas 50% germination of
seeds treated with 900 ppm GA3 (0.09%) was reported.
Higher concentrations did not significantly affect germination.
Ballington and others (1976) found that GA treatments
did not influence the final germination percentage of seeds
of ‘Tifblue’ rabbiteye blueberry. However, treatment of
seeds with 100 (0.01%), 200 (0.02%), or 500 ppm (0.05%)
GA4+7 resulted in seedlings that reached transplanting size
2 to 4 weeks earlier than did control or GA3 treatments.