Janus-Faced Nature of Light in the Cold Acclimation Processes of Maize

0492201 - ÚEB 2019 RIV CH eng J - Článek v odborném periodiku
Szalai, G. - Majlath, I. - Pál, M. - Gondor, O.K. - Rudnoy, S. - Oláh, K. - Vaňková, Radomíra - Kalapos, S. - Janda, T.
Janus-Faced Nature of Light in the Cold Acclimation Processes of Maize.
Frontiers in Plant Science. Roč. 9, JUN 19 (2018), č. článku 850. ISSN 1664-462X. E-ISSN 1664-462X
Institucionální podpora: RVO:61389030
Klíčová slova: freezing tolerance * zea-mays * chilling-tolerance * gene-expression * low-temperature * salicylic-acid * abscisic-acid * arabidopsis-thaliana * biosynthetic genes * oxidative stress * abiotic stress * acclimation * chilling * gene expression * low temperature * photoinhibition * soluble sugars * Zea mays L
Obor OECD: Plant sciences, botany
Impakt faktor: 4.106, rok: 2018

Exposure of plants to low temperature in the light may induce photoinhibitory stress symptoms, including oxidative damage. However, it is also known that light is a critical factor for the development of frost hardiness in cold tolerant plants. In the present work the effects of light during the cold acclimation period were studied in chilling-sensitive maize plants. Before exposure to chilling temperature at 5 degrees C, plants were cold acclimated at non-lethal temperature (15 degrees C) under different light conditions. Although exposure to relatively high light intensities during cold acclimation caused various stress symptoms, it also enhanced the effectiveness of acclimation processes to a subsequent severe cold stress. It seems that the photoinhibition induced by low temperature is a necessary evil for cold acclimation processes in plants. Greater accumulations of soluble sugars were also detected during hardening at relatively high light intensity. Certain stress responses were light-dependent not only in the leaves, but also in the roots. The comparison of the gene expression profiles based on a microarray study demonstrated that the light intensity is at least as important a factor as the temperature during the cold acclimation period. Differentially expressed genes were mainly involved in most of assimilation and metabolic pathways, namely photosynthetic light capture via the modification of chlorophyll biosynthesis and the dark reactions, carboxylic acid metabolism, cellular amino acid, porphyrin or glutathione metabolic processes, ribosome biogenesis and translation. Results revealed complex regulation mechanisms and interactions between cold and light signalling processes.
Trvalý link: http://hdl.handle.net/11104/0285749