Liečivé rastliny v meniacich sa environmentálnych podmienkach

Vliv abiotických a biotických stresorů na vlastnosti rostlin 11.5.2005
stressed wheat and maize. Photosynthetica 39, 2001, 161-166.
(3) Foyer, C.H., Vanacker, H., Gomez, L.D., Harbinson, J.: Regulation of photosynthesis and antioxidant
metabolism in maize leaves at optimal and chilling temperatures: review. Plant Physiol. Biochem. 40, 2002,
659-668.
(4) Aroca, R., Irigoyen, J.J., Sánchez-Díaz, M.: Photosynthetic characteristics and protective mechanisms
against oxidative stress during chilling and subsequent recovery in two maize varieties differing in chilling
sensitivity. Plant Sci. 161, 2001, 719-726.
(5) Janda, T., Szalai, G., Ducruet, J.M., Páldi, E.: Changes in photosynthesis in inbred maize lines with different
degrees of chilling tolerance grown at optimum and suboptimum temperatures. Photosynthetica 35, 1998, 205-
212.
(6) Pietrini, F., Ianneli, M.A., Battistelli, A., Moscatello, S., Loreto, F., Massacci, A.: Effects on photosynthesis,
carbohydrate accumulation and regrowth increase in maize genotypes with different sensitivity to low
temperature. Aust. J. Plant Physiol. 26, 1999, 367-373.
(7) Leipner, J., Fracheboud, Y., Stamp, P.: Effect of growing season on photosynthetic apparatus and leaf
antioxidative defenses in two maize genotypes of different chilling tolerance. Env. Exp. Bot. 42, 1999, 129-139.
(8) Fracheboud, Y., Haldimann, P., Leipner, J., Stamp, P.: Chlorophyll fluorescence as a selection tool for cold
tolerance of photosynthesis in maize (Zea mays L.). J. Exp. Bot. 50, 1999, 1533-1540.
(9) Holá, D., Langrová, K., Kočová, M., Rothová, O.: Photosynthetic parameters of maize (Zea mays L.) inbred
lines and F1 hybrids: their different response to, and recovery from rapid or gradual onset of low-temperature
stress. Photosynthetica 41, 2003, 429-442.
(10) Procházková, D., Wilhelmová, N.: Changes in antioxidative protection in bean cotyledons during natural
and continuous irradiation-accelerated senescence. Biol. Plant. 48, 2004, 33-39.
(11) Sonoike, K.: The different roles of chilling temperatures in the photoinhibition of Photosystem I and
Photosystem II. J. Photochem. Photobiol. B-Biol. 48, 1999, 136-141.
Different response of inbred and hybrid maize to chilling periods of various
duration
Keywords: stress; recovery; chilling; low temperature; maize; photosynthesis; antioxidants; genotypes;
intraspecific variability
Summary
The differences between two maize (Zea mays L.) inbred lines and their F1 hybrid in
their response to chilling periods of various duration and/or subsequent return to optimum
temperatures were analyzed by the measurement of the Photosystem 1 and 2 activities, the
photosynthetic pigments’ content and the activity of antioxidant enzymes. The results of our
work showed that some genotypes, particularly the hybrid ones, are able to withstand very
well even long-term chilling without the occurence of irreversible damage to their
photosynthetic apparatus, and that they are able to fully recover from the consequences of
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