ISHS Acta Horticulturae 439: III International Strawberry Symposium
INFRA SHORT-DAY STRAWBERRY TYPES |
| Author: | S. Izhar |
| Keywords: | Fragaria x ananassa, breeding, ISD selection, flowering induction, earliness |
| Abstract:
Knowledge of the genetic control of flowering in higher plants in general, and strawberry in particular, has remained incomplete despite recent advances in the fields of plant breeding and molecular biology. It is well known that the induction of flowering in higher plants involves the interaction of genetic factors and environmental cues. The family Rosaceae, of which Fragaria x ananassa Duch. (cultivated strawberry) is a member, is an excellent example. The present discovery relates to an early fall-flowering strawberry type, herein referred to as "infra short-day" (ISD) type, and methods for selecting such types. Flower bud primordia in ISD plants are initiated in response to relatively long light regimes (13.5–14 h) as the day length becomes shorter in late summer, while being subjected to night temperature ranging from 10–26 °C There is no apparent chilling requirement for flower development: Strawberry types classified as short-day or day-neutral do not initiate flower bud primordia under the selection and induction regimes of the present discovery. The results of the ISD is a strawberry type flowering earlier than classical short-day cultivars, and, hence, resulting in earlier fall-fruit production and harvest. The ISD trait can be combined with other traits to produce fruit characterized by good taste with the majority of ISD types possessing high total yield, high soluble solids, good shape and size, as well as long shelf life. | |
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