FLOWERING RESPONSE OF AN INTERMEDIATE-DAY PLANT, SALSOLA KOMAROVII ILJIN UNDER DIFFERENT PHOTOPERIODIC CONDITIONS

摘要

The photoperiodic flowering response of Salsola komarovii Iljin (Chenopodiaceae) was studied. The plants flowered earliest under an intermediate-day photoperiodic regime of 12-h light and 12-h dark. The flowering response was strongest under these conditions when the response was observed during an early stage of development, whereas the same level of response was obtained even under short-days when observed at a later stage. The nodes on the main stem at which the first flowers were formed were lowest under photoperiodic regimes with dark periods of 12 h and longer. The flowering response was stronger under a prolonged cycle of 12-h light and 16-h dark regime than under the 12-h light and 12-h dark regime. A light-break given at the middle of a 16-h dark period completely inhibited flowering. The results indicate that S. komarovii is an intermediate-day plant and that the intermediate-day plant is a variation of a short-day plant response that has a requirement for a long light period.