Photoperiodic response of genetically diverse lettuce accessions

Photoperiodic response of genetically diverse lettuce accessions

1995

A:PS

A series of experiments was undertaken to study daylength-mediated control of transition to flowering in lettuce (Lactuca sativa), a quantitative long-day plant. Several genotypes (cultivars, landraces and mutant lines) were grown at different photoperiods, sometimes in combination with different temperatures, and measured for number of days to either bolting initiation (a detectable increase in the rate of stem elongation) or anthesis of the first flower (a standard measure of maturity in lettuce). Experiments were conducted in controlled or partially controlled environments. Results of these studies indicated that: high temperature alone was not sufficient to induce the bolting response, whereas photoperiod was; there was a range of genetic responses to various daylengths among genotypes; and one of the genes known to control bolting initiation, T, exhibited reverse dominance in conjunction with the early flowering genes, depending on daylength. The latter observation implied that the genetic role of T needs further investigation, as it does not appear to operate by simple dominance alone.

v.120(3):460-467, AMERICAN SOCIETY FOR HORTICULTURAL SCIENCE, JOURNAL

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