Abstract
Changes in anthocyanin content and transcript abundance for genes whose products function in general phenylpropanoid metabolism and the anthocyanin pathway were monitored in maize (Zea mays L.) seedlings during short-term, low-temperature treatment. Anthocyanin and mRNA abundance in sheaths of maize seedlings increased with the severity and duration of cold. Anthocyanin accumulation was found in all tested lines that were genotypically capable of any anthocyanin production. Within 24 h of transferring 7-d maize (B37N) seedlings to 10° C, phenylalanine ammonia-lyase (Pal) (EC 4.3.1.5)-homologous and chalcone synthase (C2) (EC 2.3.1.74) transcript levels increased at least 8- and 50-fold, respectively, and 4-coumarate:CoA ligase (4Cl) (EC 6.2.1.12)-homologous and chalcone isomerase (Chi) (EC 5.5.1.6)-homologous transcripts increased at least 3-fold over levels in unstressed plants. Time-course studies showed thatPal (EC 4.3.1.5) andC2-transcript levels remained relatively constant for the first 12 h of cold stress, dramatically increased over the next 12 h, and declined to pretreatment levels within 2 d of returning coldstressed seedlings to ambient (25° C) temperature. Transcripts4Cl (EC 6.2.1.12) andChi (EC 5.5.1.6) increased in abundance within 6 h of cold stress, exhibited no further increase over the next 36 h, and declined to pretreatment levels upon returning seedlings to 25° C. Transcripts homologous to two regulatory (R, C1) and three structural (A1,A2, andBz2) anthocyanin genes increased at least 7- to 10-fold during cold treatment, exhibiting similar kinetics of accumulation as forPal (EC 4.3.1.5) andC2 transcripts. Transcripts encoded byBz1, the anthocyanin structural gene for UDP:glucose-flavonol glucosyltransferase (EC 2.4.1.91), were relatively abundant in control tissues and exhibited only a transient increase during the cold period. Our studies suggest that the genes of the anthocyanin biosynthetic pathway can be consideredcor (Cold-Regulation) genes, and because this pathway is well defined, it is an excellent subject for characterizing plant molecular responses to low temperatures.
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We wish to thank members of the Walbot laboratory, especially Raj Dhindsa (now at McGill University, Montreal, Quebec, Canada) and John Bodeau for genetic stocks, valuable discussions and critical reviews of this manuscript. We also thank Majid Shirzadegan, Joe Ecker (Department of Biology, University of Pennsylvania, Philadelphia, USA), Elise Dement (The Carnegie Institution of Washington, Stanford, Cal., USA), and Mike Fromm (Monsanto, St. Louis, Mo., USA) for providing DNA sequences. We especially recognize and heartfully thank Alex Bloom for her many contributions. This work was supported by the Rockefeller Foundation (Grant No. RF 87058 # 58). P.J.C. was supported in part by an American Cancer Society Postdoctoral Fellowship # PF2937 and M.R.A. was supported by an NSF postdoctoral fellowship (# BIR-9203798)
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Christie, P.J., Alfenito, M.R. & Walbot, V. Impact of low-temperature stress on general phenylpropanoid and anthocyanin pathways: Enhancement of transcript abundance and anthocyanin pigmentation in maize seedlings. Planta 194, 541–549 (1994). https://doi.org/10.1007/BF00714468
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DOI: https://doi.org/10.1007/BF00714468