EFFECT OF PHOTOPERIOD AND TEMPERATURE DROP ON COLD RESISTANCE AND DRY MATTER PRODUCTION AND PARTITIONING IN CUCUMBER PLANTS

M.I. Sysoeva, E.F. Markovskaya, E.G. Sherudilo, T.G. Shibaeva, E.A. Spiridonova
The effect of daily temperature drop treatments under different photoperiods on dry matter (DM) production and cold resistance in cucumber plants (Cucumis sativus L.) at early stages of development were studied. Daily temperature drop from 20 to 12°C for 2 and 6 h at the end of the night did not affect DM accumulation under all photoperiods except the 24-h photoperiod where DM production was reduced. Temperature drop treatments did not affect the partitioning of DM under 8, 12 and 16 h photoperiods, but under continuous light more DM was allocated to the roots of plants treated by low temperature. Plant resistance was much higher in plants treated by temperature drop compared to those constantly exposed to low hardening temperature under all photoperiods. The involvement of phytochrome B in the development of cold resistance in plants treated by temperature drop, but not in those constantly exposed to low temperature is suggested. The hypothesis is put forward that continuous light inhibits plant responses that involve cyclic processes.
Sysoeva, M.I., Markovskaya, E.F., Sherudilo, E.G., Shibaeva, T.G. and Spiridonova, E.A. (2011). EFFECT OF PHOTOPERIOD AND TEMPERATURE DROP ON COLD RESISTANCE AND DRY MATTER PRODUCTION AND PARTITIONING IN CUCUMBER PLANTS. Acta Hortic. 907, 263-266
DOI: 10.17660/ActaHortic.2011.907.42
https://doi.org/10.17660/ActaHortic.2011.907.42
Cucumis sativus L., temperature drop, photoperiod, cold resistance, continuous light
English

Acta Horticulturae