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Regulation of the loss of frost hardiness in Pinus radiata by photoperiod and temperature
Author(s) -
GREER D. H.,
STANLEY C. J.
Publication year - 1985
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.1365-3040.1985.tb01217.x
Subject(s) - hardiness (plants) , photoperiodism , botany , horticulture , frost (temperature) , pinus radiata , radiata , biology , chemistry , meteorology , cultivar , physics , vigna
. In controlled environments, the interactive effects of warm (16: 8°C, day: night) and cool (12: 4°C, day: night) temperatures and long (13.5 h) and short (10 h) photoperiods on the dehardening of seedlings of Pinus radiata D. Don were investigated. In another experiment, the effect of four photoperiods from 9 to 14 h was examined. In a third, dehardening at constant temperatures from 5 to 17°C was followed. There was no evidence for an interaction between photoperiod and temperature. Dehardening was temporarily delayed by photoperiods below about 10 h, but there was no other quantitative effect of photoperiod. At constant temperatures, the rate of dehardening was initially constant but declined as the minimum summer frost hardiness was reached. In the initial phase the rate of dehardening was a linear function of temperature, increasing from 0.05°C day −1 at 8°C to 0.30 °C day −1 at 17°C. Temperature controlled the loss of frost hardiness by regulating the rate of dehardening.