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Dissecting molecular and physiological response mechanisms to high solar radiation in cyanic and acyanic leaves: a case study on red and green basil.
Tattini, Massimiliano; Sebastiani, Federico; Brunetti, Cecilia; Fini, Alessio; Torre, Sara; Gori, Antonella; Centritto, Mauro; Ferrini, Francesco; Landi, Marco; Guidi, Lucia.
Affiliation
  • Tattini M; National Research Council of Italy, Department of Biology, Agriculture and Food Sciences, Institute for Sustainable Plant Protection, Via Madonna del Piano 10, I-50019 Sesto Fiorentino, Florence, Italy.
  • Sebastiani F; National Research Council of Italy, Department of Biology, Agriculture and Food Sciences, Institute for Sustainable Plant Protection, Via Madonna del Piano 10, I-50019 Sesto Fiorentino, Florence, Italy.
  • Brunetti C; Department of Agri-Food Production and Environmental Sciences, University of Florence, Viale delle Idee 30, I-50019, Sesto Fiorentino, Florence, Italy.
  • Fini A; National Research Council of Italy, Department of Biology, Agriculture and Food Sciences, Trees and Timber Institute, Via Madonna del Piano 10, I-50019 Sesto Fiorentino, Florence, Italy.
  • Torre S; Department of Agri-Food Production and Environmental Sciences, University of Florence, Viale delle Idee 30, I-50019, Sesto Fiorentino, Florence, Italy.
  • Gori A; Department of Agricultural and Environmental Sciences - Production, Landscape, Agroenergy, University of Milan, via Celoria 2, I-20122 Milan, Italy.
  • Centritto M; National Research Council of Italy, Department of Biology, Agriculture and Food Sciences, Institute for Sustainable Plant Protection, Via Madonna del Piano 10, I-50019 Sesto Fiorentino, Florence, Italy.
  • Ferrini F; Department of Agri-Food Production and Environmental Sciences, University of Florence, Viale delle Idee 30, I-50019, Sesto Fiorentino, Florence, Italy.
  • Landi M; National Research Council of Italy, Department of Biology, Agriculture and Food Sciences, Trees and Timber Institute, Via Madonna del Piano 10, I-50019 Sesto Fiorentino, Florence, Italy.
  • Guidi L; Department of Agri-Food Production and Environmental Sciences, University of Florence, Viale delle Idee 30, I-50019, Sesto Fiorentino, Florence, Italy.
J Exp Bot ; 68(9): 2425-2437, 2017 04 01.
Article in En | MEDLINE | ID: mdl-28419325
ABSTRACT
Photosynthetic performance and the expression of genes involved in light signaling and the biosynthesis of isoprenoids and phenylpropanoids were analysed in green ('Tigullio', TIG) and red ('Red Rubin', RR) basil. The aim was to detect the physiological and molecular response mechanisms to high sunlight. The attenuation of blue-green light by epidermal anthocyanins was shown to evoke shade-avoidance responses with consequential effects on leaf morpho-anatomical traits and gas exchange performance. Red basil had a lower mesophyll conductance, partially compensated by the less effective control of stomatal movements, in comparison with TIG. Photosynthesis decreased more in TIG than in RR in high sunlight, because of larger stomatal limitations and the transient impairment of PSII photochemistry. The methylerythritol 4-phosphate pathway promoted above all the synthesis and de-epoxidation of violaxanthin-cycle pigments in TIG and of neoxanthin and lutein in RR. This enabled the green leaves to process the excess radiant energy effectively, and the red leaves to optimize light harvesting and photoprotection. The greater stomatal closure observed in TIG than in RR was due to enhanced abscisic acid (ABA) glucose ester deglucosylation and reduced ABA oxidation, rather than to superior de novo ABA synthesis. This study shows a strong competition between anthocyanin and flavonol biosynthesis, which occurs at the level of genes regulating the oxidation of the C2-C3 bond in the dihydro-flavonoid skeleton.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Photosynthesis / Sunlight / Carbon Dioxide / Plant Leaves / Gene Expression Regulation, Plant / Ocimum basilicum Language: En Journal: J Exp Bot Journal subject: BOTANICA Year: 2017 Document type: Article Affiliation country:

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Photosynthesis / Sunlight / Carbon Dioxide / Plant Leaves / Gene Expression Regulation, Plant / Ocimum basilicum Language: En Journal: J Exp Bot Journal subject: BOTANICA Year: 2017 Document type: Article Affiliation country:
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