Alterations in Chlorophyll a Fluorescence and Pigments Concentration in the Leaves of Cauliflower and Broccoli Transplants Subjected to Chilling

作者：Wojciechowska Renata; Kalisz Andrzej^*; Sekara Agnieszka; Nosek Michal; Cebula Stanislaw; Miszalski Zbigniew; Kunicki Edward; Grabowska Aneta

来源：Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 2016, 44(1): 17-24.

DOI：10.15835/nbha44110251

• Brassica crops
• carotenoids
• chlorophylls
• low temperature
• F-v/F-m
• performance index

Chlorophyll a fluorescence parameters and photosynthetic pigments content in leaves of broccoli (Brassica oleracea L. var. italica) cv. `Monaco' F-1 and cauliflower (Brassica oleracea L. var. botrytis) cv. `Bruce' F-1 transplants were analyzed to investigate the effects of chilling temperatures (6 and 10 degrees C) and the exposure length (1 or 2 weeks) on the photosynthetic apparatus condition in 3-year experiment. Data were compared to control plants exposed to 14 degrees C for 1 and 2 weeks. The lowest values of maximum quantum efficiency of photosystem II (F-v/F-m) and the performance index (PI) were observed in cauliflower chilled at 6 degrees C for 2 weeks. This was not accompanied by any substantial reduction in chlorophylls concentration, however, significant correlations between F-v/F-m or PI and chlorophylls content in cauliflower leaves were found. There was no negative effects of chilling on photosynthetic activity and chlorophyll content in broccoli leaves, the amount of carotenoids significantly increased in the broccoli chilled for 2 weeks in 6 degrees C. The chlorophyll a fluorescence indices and accelerated carotenoids synthesis showed that broccoli had less vulnerable photosynthetic apparatus to stress-induced temperatures and more efficient protection mechanisms in comparison to cauliflower transplants.

• 出版日期2016-6