Flowering inhibition effects of long days preceding inductive short days on the short-day plant Hibiscus cannabinus cv. South-Selected

Ren, X.C.; Zhang, J.Y.; Luo, W.H.; Jin, S.P.

Acta Phytophysiologia Sinica 8(3): 213-221


Accession: 001079461

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H. cannabinus cv. South-Selected seedlings were sensitive to daylength even before expansion of the cotyledons. Seedlings grown in short days or in 10 short days followed by light-break short days all formed flower buds within 16 days but if long days preceeded the short day treatment all were vegetative after 30 days. Use of a neutral daylength of 13 h light/11 h dark showed that seedling age did not cause the difference due to long day treatment. The inhibitory effect of long days was cumulative. The inhibition could be transferred to plants of Pharbitis nil by injecting sap expressed from cotyledons of H. cannabinus suggesting the presence of a growth inhibitor. Long day inhibition was not affected by reducing temp. from 25 to 15 deg C during either the light or dark periods in long days and was not affected by IAA, NAA, ABA, ethephon, GA, BA, kinetin or TIBA.