ISHS Acta Horticulturae 407: ISHS Brassica Symposium - IX Crucifer Genetics Workshop
THE PHYSIOLOGY OF FLOWERING IN BRASSICAS, ESPECIALLY ABOUT CAULIFLOWER AND BROCCOLI |
| Authors: | Y. Fujime, N. Okuda |
| Keywords: | vernalization, curd morphology, abnormal curd, bolting, scanning electron microscope (SEM) |
| DOI: | 10.17660/ActaHortic.1996.407.30 |
| Abstract:
A curd of cauliflower is composed of a flower stalk and many 1st-order inflorescences which branch several times and whose tips are shortened considerably. There are numerous inflorescence primordia being the state of primary protuberance of the curd surface. Being different from the curd of cauliflower, there are numerous flower buds on the head of broccoli. When cauliflower was not exposed to low temperature after curd formation, peduncle did not elongate well and flower bud development was still suppressed at the state of primary protuberance, then the curd withered. The extent of chilling requirement for flower bud initiation in cauliflower is thought to be greater than that for curd formation. When growing temperature is lower than the optimum temperature for curd development, riciness occurs probably resulting from precedence of flower bud development over curd development. On the contrary, when growing temperature is higher than the optimum temperature for curd development, fuzzy head bearing developed bracteoles are formed, probably resulting from partial reversion of curd development to vegetative phase. Leafy heads in which green leaves grow through the surface of the curd occur when the curd of cauliflower exposed to the temperature higher than inducing fuzzy heads. These leaves develop from axillary bracts of primary peduncles. | |
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