Effects of long-day treatment and night temperature in winter on the growth and flowering of snapdragons (Antirrhinum majus L.) with different earliness
2008
Inaba, Z.(Shizuoka-ken. Research Inst. of Agriculture and Forestry, Higashiizu (Japan). Izu Agricultural Research Inst.) | Kato, C. | Murakami, S. | Ishii, C.
Effects of the winter night temperature (11degC or 16degC) and the photoperiod (natural day length or 16 hr) on the growth and flowering of snapdragons (Antirrhinum majus L.) with different earliness were investigated. Seeds of a Group II cultivar 'Light Pink Butterfly II (LPB II)' and a Group III cultivar 'Light Pink Butterfly III (LPB III)' were sown in August and seedlings were pinched in September. The 16 hr long-day treatment from the end of September increased the plant height of 'LPB III'. Long-day treatment decreased the number of days to flowering and increased the yield of cut flowers branched from the first node shoots and the cotyledon node ones in 'LPB II', and similar results were obtained in 'LPB III' which were grown under 16 hr long-day and 16degC night temperature. Throughout the growing period, length of cut flowers harvested from 'LPB III' was longer than that from 'LPB II'. In conclusion, the long-day treatment combined with 16degC night temperature was effective for decreasing the number of days to flowering and increasing the yield of cut flowers of 'LBP III' in winter.
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