Photoperiodic sensitivity of inflorescence initiation and development in sunflower
1981
Marc, J. (Sydney Univ. (Australia). School of Biological Sciences) | Palmer, J.H. (New South Wales Univ., Sydney (Australia). School of Botany)
The photoperiodic sensitivity of two "early" oilseed sunflower cultivars, (Helianthus annuus L.), Sunfola 68-2 and HA-124, was assessed by determining the time for flower initiation to progress through a sequence of 10 floral stages, defined by reference to scanning electron microscope photographs of fixed stem apices. It was found for plants maintained in controlled environments with daylengths of 11 or 18 h that there was no significant difference in the time of flower initiation in either cultivar, although post-initiation development of the primordial inflorescence was faster in the 11 h short day leading to an earlier anthesis. It is concluded that post-initiation sensitivity to daylength may account for some of the variation in the time of anthesis and the "head visible" stage, reported for Sunfola 68-2 and other cultivars and hybrids
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