Premium
Cold‐acclimation of Hibiscus rosa‐sinensis L. and Hibiscus syriacus L. in natural and controlled environments
Author(s) -
TEETS T. M.,
HUMMEL R. L.,
GUY C. L.
Publication year - 1989
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1989.tb02122.x
Subject(s) - hardiness (plants) , acclimatization , cold tolerance , horticulture , frost (temperature) , hibiscus , biology , botany , photoperiodism , cultivar , meteorology , physics
Seasonal cold‐acclimation patterns and the effects of photoperiod and temperature on cold‐hardiness of Hibiscus rosa‐sinensis L. and Hibiscus syriacus L. were determined. Field‐grown H. rosasinensis consistently failed to survive freezing at ‐ 2°C. Two genotypes of field‐ and container‐grown H. syriacus initiated cold‐acclimation in mid September, in response to decreasing daylength, and continued to an ultimate midwinter hardiness level of ‐ 27°C in early February. Controlled environment experiments using combinations of short days (SD) and cool day/night temperatures were unable to induce even minimal cold acclimation of H. rosasinensis. In controlled environments, H. syriacus attained a moderate amount of cold tolerance at warm temperatures and long days (LD). Low night temperature combined with LD, warm day produced the same degree of cold‐acclimation as the SD treatments. While not essential, SD enhanced H. syriacus cold‐acclimation in controlled environments. A ‐ 5°C frost treatment of intact plants did not enhance cold‐hardiness of H. syriacus.