Sammanfattning

Cassava (Manihot esculenta Crantz) is a predominant food security crop in several developing countries. Its storage roots, rich in carbohydrate, are deficient in essential micronutrients, including provitamin A carotenoids.Increasing carotenoid content in cassava storage roots is important to reduce the incidence of vitamin A deficiency, a public health problem in sub-Saharan Africa. However, cassava improvement advances slowly, mainly due to limited information on the molecular factors influencing 13-carotene accumulation in cassava.To address this problem, we performed comparative transcriptomic and untargeted metabolic analyses of roots and leaves of eleven African cassava landraces ranging from white to deep yellow colour, to uncover regulators of carotenoid biosynthesis and accumulation with conserved function in yellow cassava roots.Sequence analysis confirmed the presence of a mutation, known to influence 13-carotene content, in PSY transcripts of deep yellow but not of pale yellow genotypes. We identified genes and metabolites with expression and accumulation levels significantly associated with 13-carotene content. Particularly an increased activity of the abscisic acid catabolism pathway together with a reduced amount of L-carnitine, may be related to the carot-enoid pathway flux, higher in yellow than in white storage roots. In fact, NCED_3.1 was specifically expressed at a lower level in all yellow genotypes suggesting that it could be a potential target for increasing carotenoid accumulation in cassava.These results expand the knowledge on metabolite compositions and molecular mechanisms influencing carotenoid biosynthesis and accumulation in cassava and provide novel information for biotechnological ap-plications and genetic improvement of cassava with high nutritional values.

Nyckelord

Cassava; Carotenoids; Transcriptome; Metabolites; NCED; provitamin A; psy

Publicerad i

Plant Physiology and Biochemistry
2023, Volym: 199, artikelnummer: 107713
Utgivare: ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER

SLU författare

• Olayide, Priscilla Olukola

  • Institutionen för växtskyddsbiologi, Sveriges lantbruksuniversitet
    
  • International Institute of Tropical Agriculture (IITA)

• Alexandersson, Erik

  • Institutionen för växtskyddsbiologi, Sveriges lantbruksuniversitet
    

• Lenman, Marit

  • Institutionen för växtskyddsbiologi, Sveriges lantbruksuniversitet
    

Globala målen

SDG2 Avskaffa hunger, uppnå tryggad livsmedelsförsörjning och förbättrad nutrition samt främja ett hållbart jordbruk


UKÄ forskningsämne

Biokemi och molekylärbiologi
Botanik


Publikationens identifierare

DOI: https://doi.org/10.1016/j.plaphy.2023.107713

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/122420