'Earliglow' strawberry plants were sampled from September to the end of October and subjected to short days (9 h) or long days (9 h with the dark period interrupted from 23.00 to 02.00 h with low-level incandescent radiation), with or without chilling (4.4°C), in the phytotron at NCSU. Plants were then forced under either short or long days in a greenhouse and floral induction, initiation, differentiation and development were studied. Short days enhanced induction and initiation, but tended to delay differentiation. Macroscopic cluster production was enhanced with slight chilling (50 h), but was delayed by 3 weeks with substantial chilling (150 h). The studies also indicated that developmental studies with strawberries must rely on several growth characteristics when assessing photoperiod or temperature effects on a given response. For example, if flower cluster production is used as a measure of rest, short days alone cannot induce rest in 'Earliglow'. However, if leaf production is the indicator, rest is induced by short days alone.
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