Abstract
Abstract An inhibitory effect of light on in vitro late embyogeny of I. aquifolium and I. opaca cv. Farage was observed. A negative log-linear correlation between the final embryo size and hours of continuous light during preincubation, at an intensity of 64 W·m−2, was established with I. aquifolium. It took ≈ 15 hr of pre-incubation light to result in 50% growth inhibition. Negative log-linear correlations between the final embryo lengths and light intensities were also observed for I. aquifolium and I. opaca. The rudimentary embryos of I. opaca were more sensitive to light inhibition than those of I. aquifolium. During incubation for 11 and 14 days with a 16-hr photoperiod, light intensities for 50% growth inhibition were ≈ 5 and 11 W·m−2 for I. opaca and I. aquifolium, respectively. Since growth inhibition by light could not be reversed by the presence of GA3 concentrations up to 1000 μm, some factor(s) other than the accumulation of abscisic acid or related compounds is probably responsible for such a phenomenon.
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