The influence of seedling size and carbohydrate status and of photon flux density during vernalization on inflorescence initiation in onion (Allium cepa L.)
1985
Brewster, J.L.
Experiments were done in controlled conditions to investigate the relationship of plant weight, leaf number and raising conditions to inflorescence initiation in onion seedlings. Above a shoot dry weight of 0.06 g the spring-sown cv. Rijnsburger could initiate inflorescences, whereas the autumn-sown cv. Senshyu semi-globe Yellow needed to be heavier than 0.45 g. Plants raised at a photon flux density of 200 μmol m−2s−1 and a temperature of 25 °C required longer to initiate inflorescences than plants raised at 600 μmol m−2s−1 and 17 °C which had higher reserve carbohydrate content. The minimum leaf number for inflorescence initiation was larger for plants with low reserve carbohydrate content. Photon flux densities of 50, 100, 200 and 400 μmol m−2s−1 during vernalization at 9 °C caused no differences in inflorescence initiation in plants previously raised at l7 °C and 600 μmol m−2s−1 but the lowest photon flux density during vernalization reduced initiation in plants previously raised at 25 °C and 200 μmol m−2s−1.
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