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Regulation of frost resistance during cold de‐acclimation and re‐acclimation in oilseed rape. A possible role of PSII redox state
Author(s) -
Rapacz Marcin
Publication year - 2002
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 - 10.1034/j.1399-3054.2002.1150209.x
Subject(s) - acclimatization , photosynthesis , frost (temperature) , biology , botany , horticulture , elongation , photoperiodism , brassica , meteorology , physics , materials science , metallurgy , ultimate tensile strength
A possible role of photosynthetic apparatus during cold de‐acclimation was studied in oilseed rape ( Brassica napus var. oleifera ). Plants of spring (Star) and winter (Górczañski) cultivars were cold acclimated at + 5°C, and de‐acclimated during 4 weeks at combinations of + 12 and + 20°C operating in the light or/and dark, with a 12‐h photoperiod. Evidence is presented that the photosynthetic apparatus may be involved in temperature perception during de‐acclimation. De‐acclimation was faster under a 20/12°C (day/night) treatment than under the reverse 12/20°C (day/night). De‐acclimation rate was constant when the day temperature was constant, irrespective of the night temperature both under cold day temperature regimes (12/20, 12/12°C (day/night) and warm‐day treatments (20/12, 20/20°C (day/night). The fast decrease in frost resistance observed under warm‐day de‐acclimation was always accompanied by an acceleration of elongation growth. In the spring cultivar, elongation growth increased starting from the second week of de‐acclimation, regardless of temperature conditions. Once elongation growth had commenced during de‐acclimation, it continued throughout the period necessary for re‐acclimation to low temperature. Re‐acclimation to the initial freezing tolerance level was only possible when plant elongation was reduced. In addition re‐acclimation of the photosynthetic apparatus to low temperature was impossible in fast growing plants. A possible relationship between PSII, growth rate and frost resistance during cold acclimation and de‐acclimation is discussed.