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High temperatures reduce postharvest flowering of specialty floral crop species.

Williams, M. S.; Starman, T. W.; Faust, J. E.;

HortTechnology Year: 1999 Vol: 9 Issue: 1 Pages: 94-98 Ref: 4 ref.

1999

บทคัดย่อ

High temperatures reduce postharvest flowering of specialty floral crop species.

The effect of increasing temperatures on the duration of postharvest flower development was determined for 3 specialty crop species: marguerite (Argyranthemum frutescens, cultivars Butterfly and Sugar Baby), swan river daisy (Brachycome hybrida, cv. Ultra) and bacopa (Sutera cordata, cv. Snowflake). Plants were grown in a greenhouse at 18 deg C (65 deg F) until flowering, and then transferred into a phytotron to determine heat tolerance. Plants were stored for 8 weeks at constant temperatures of 18, 23, 28 and 33 deg C (65, 73, 82 and 91 deg F) for 2-week intervals. Flower bud and flower number were recorded weekly. S. cordata and B. hybrida had the greatest flower number at the 23 deg C temperature, decreasing in the 28 deg C environment. A. frutescens cultivars had the greatest flower number at 28 deg C, but flowers were of lower quality than at 23 deg C. Flower development of all cultivars ceased at 33 deg C, at the end of 8 weeks at increasing temperatures, but when plants were returned to t

he 18 deg C production greenhouse, flower development resumed. High temperatures (28 deg C) reduce the postharvest performance of S. cordata, B. hybrida and A. frutescens plants grown in hanging baskets; therefore, these species should be marketed as spring-flowering products since summer performance may be unsatisfactory in warm climates.