The effects of brassinosteroids on photosynthetic parameters in leaves of two field-grown maize inbred lines and their F1 hybrid
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The effect of foliar spray with 10−12 M aqueous solutions of 24-epibrassinolide or a synthetic androstane analogue of castasterone on the activity of photosystem (PS) 1, the Hill reaction activity, the content of photosynthetic pigments and the specific leaf mass was examined for three different leaves developed after brassinosteroid (BR) treatment in two inbred lines of field-grown maize and their F1 hybrid. The brassinosteroids significantly affected neither the efficiency of photosynthetic electron transport, nor the content of chlorophylls or carotenoids.
Additional key wordscarotenoids chlorophylls 24-epibrassinolide heterosis Hill reaction photosystem 1
days after sowing
Hill reaction activity
photosynthetically active radiation
specific leaf mass
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The authors are grateful to Dr. Jaroslav Poruba from the CEZEA Breeding Station in Čejč, Czech Republic, for the supply of maize kernels, and to our students Lenka Fridrichová and Zuzana Novosadová for their help with the measurements of photosynthetic parameters. This study was supported by grants No. KJB601110611 of the Grant Agency of the Academy of Sciences of the Czech Republic, No. MSM0021620858 from the Ministry of Education, Youth and Sports of the Czech Republic, and IOCB research project Z4 055 0506.
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