Journal
JOURNAL OF PLANT GROWTH REGULATION
Volume 29, Issue 4, Pages 500-505Publisher
SPRINGER
DOI: 10.1007/s00344-010-9153-0
Keywords
Brassinosteroids; Carotenoids; Chlorophylls; Growth; Hill reaction; Low-temperature stress; Photosynthesis; Photosystem 1; Zea mays
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Funding
- Grant Agency of the Academy of Sciences of the Czech Republic [KJB601110611]
- Ministry of Education, Youth and Sports of the Czech Republic [MSM0021620858]
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The effect of various concentrations of exogenously applied 24-epibrassinolide (E) and 2 alpha,3 alpha,17 beta-trihydroxy-5 alpha-androstan-6-one (A) on the activities of Photosystem 1 and the Hill reaction, the contents of photosynthetic pigments, and the growth of plants was examined in young maize (Zea mays L.) plants subjected to long-term chilling stress or grown in normal-temperature conditions. Neither the activity of Photosystem 1 nor the Hill reaction activity of plants was in any way affected by the treatment with brassinosteroids (BRs), which suggests that the photosynthetic complexes of thylakoid membranes are not the primary site of the influence of BRs on photosynthesis. An extremely low (10(-14) M) concentration of A applied to the nonstressed plants significantly increased the length of their 4th to the 7th leaves and their height, as well as the contents of chlorophylls a and b and total carotenoids. However, under chilling conditions, this positive effect was significant for the chlorophyll content only and higher concentrations of BRs (10(-12), 10(-10), 10(-8) M) usually had no effect at all.
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