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The consequences of freezing temperatures followed by high irradiance on in vivo chlorophyll fluorescence and growth in Picea abies
Author(s) -
Welander N. T.,
Gemmel P.,
Hellgren O.,
Ottosson Birgitta
Publication year - 1994
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.1399-3054.1994.tb00667.x
Subject(s) - chlorophyll fluorescence , irradiance , picea abies , fluorescence , botany , chlorophyll , freezing tolerance , chlorophyll a , in vivo , chemistry , biology , biophysics , biochemistry , optics , microbiology and biotechnology , physics , gene
Picea abies (L.) Karst. plants, propagated by cuttings, were subjected to one night of freezing temperatures (‐5°C), high irradiance (1 200 or 1 800 μmol m −2 s −1 ), or freezing temperatures followed by high irradiance. The treatments were applied at bud burst, at time of shoot elongation, and when the shoots had ceased to elongate. The maximum quantum yield of photosynthesis, F v /F m , dry weight of branches and needles, and length and survival of shoots were measured. F v /F m and growth decreased after a night of freezing temperatures followed by high irradiance, at the time of bud burst and shoot elongation. High irradiance alone influenced F v /F m , but not growth. Freezing temperatures affected F v /F m , and growth at the time of shoot elongation. F 0 increased after a night of freezing temperatures and decreased with age of the current‐year needles. It was concluded that the use of short‐term measurements of chlorophyll fluorescence induction to predict changes in growth after a night of frost and subsequent high light was not a reliable method.