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Vegetative growth and frost hardiness of cloudberry ( Rubus chamaemorus ) as affected by temperature and photoperiod
Author(s) -
Kaurin Åse,
Stushnoff Cecil,
Junttila Olavi
Publication year - 1982
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1982.tb02267.x
Subject(s) - photoperiodism , shoot , rhizome , horticulture , hardiness (plants) , petiole (insect anatomy) , frost (temperature) , botany , rubus , biology , paclobutrazol , chemistry , cultivar , hymenoptera , geomorphology , geology
The effect of photoperiod and temperature on growth and induction and development of frost hardiness in cloudberry ( Rubus chamaemorus L.) was examined in two experiments. The photoperiods were 8, 12 or 24 h and the temperatures were 18, 15, 12, 9, 4, 3, –3 or –4°C depending on the experiment. The level of hardiness was expressed as LT 66 or LT 50 (the lethal temperature for 66 or 50% of the plant material) for percentage of bud break and for the degree of coloring by triphenyltetrazolium chloride for rhizomes. The vegetative growth was clearly affected by daylength; petiole elongation, leaf growth, shoot dry weight and number of shoots per plant were all reduced under short days compared with long days. However, the photoperiod had no significant effect on hardening of buds or rhizomes. Hardening increased with successively decreasing temperatures. To get the maximum hardiness, plants had to be exposed to freezing temperatures.