Manipulation of plastidial protein quality control components as a new strategy to improve carotenoid contents in tomato fruit
D'Andrea, Lucio (Centre de Recerca en Agrigenòmica)
Rodríguez Concepción, Manuel (Centre de Recerca en Agrigenòmica)

Fecha:	2019
Resumen:	Carotenoids such as β-carotene (pro-vitamin A) and lycopene accumulate at high levels during tomato (Solanum lycopersicum L. ) fruit ripening, contributing to the characteristic color and nutritional quality of ripe tomatoes. Besides their role as pigments in chromoplast-harboring tissues such as ripe fruits, carotenoids are important for photosynthesis and photoprotection in the chloroplasts of photosynthetic tissues. Interestingly, recent work in Arabidopsis thaliana (L. ) Heynh. has unveiled a critical role of chloroplast protein quality control components in the regulation of carotenoid biosynthesis. The accumulation (i. e. degradation rate) and activity (i. e. folding status) of phytoene synthase (PSY) and other Arabidopsis biosynthetic enzymes is modulated by chaperones such as Orange (OR) and Hsp70 in coordination with the stromal Clp protease complex. OR and Clp protease were recently shown to also influence PSY stability and carotenoid accumulation in tomato. Here we show how manipulating the levels of plastid-localized Hsp70 in transgenic tomato plants can also impact the accumulation of carotenoids in ripe fruit. The resulting carotenoid profile and chromoplast ultrastructure, however, are different from those obtained in tomatoes from transgenic lines with increased OR activity. These results suggest that different chaperone families target different processes related to carotenoid metabolism and accumulation during tomato ripening. We further discuss other possible targets for future manipulation in tomato based on the knowledge acquired in Arabidopsis.
Ayudas:	Agencia Estatal de Investigación BIO2017-84041-P Ministerio de Economía y Competitividad BIO2017-90877-REDT Ministerio de Educación, Cultura y Deporte AP2012-0189 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-710 Ministerio de Economía y Competitividad SEV-2015-0533
Nota:	Altres ajuts: CERCA Programme/Generalitat de Catalunya
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Carotenoids ; Clp protease ; Chaperones ; Hsp70 ; Protein quality control ; Tomato
Publicado en:	Frontiers in plant science, Vol. 10 (September 2019) , art. 1071, ISSN 1664-462X

DOI: 10.3389/fpls.2019.01071
PMID: 31543891

7 p, 1.9 MB

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