Courgette Ronde Jaune (Cucurbita pepo) — Plant Gene Profile | Zobium

Flavor & Sensory Profile

Dominant notes: fresh green, mild vegetal, faint floral, neutral cream.

Key Genes in Courgette Ronde Jaune

• Phytoene Synthase 1 (CpPSY1) — Encodes the first committed enzyme of carotenoid biosynthesis, converting geranylgeranyl pyrophosphate to phytoene; high expression drives the brilliant yellow skin colour of this variety.: produces phytoene, lutein
• Carotenoid Cleavage Dioxygenase 1 (CpCCD1) — Encodes a carotenoid cleavage enzyme that oxidatively cleaves carotenoids into apocarotenoid volatiles, contributing mild floral and vegetal aroma notes in the flesh.: produces β-ionone, geranylacetone
• Terpene Synthase 1 (β-Caryophyllene) (CpTPS1) — Encodes a sesquiterpene synthase responsible for (E)-β-caryophyllene emission; expression is suppressed under Aphis gossypii infestation, indicating a role in constitutive herbivore defence.: produces (E)-β-caryophyllene, sesquiterpene volatiles
• Lipoxygenase 1 (CpLOX1) — Encodes a lipoxygenase that initiates the hydroperoxide lyase branch of fatty acid metabolism, generating C6 aldehydes and alcohols responsible for the characteristic fresh, green, cut-vegetable aroma of raw courgette.: produces hexanal, (Z)-3-hexenol
• Fruit Shape — SUN locus (CpSUN) — Encodes a regulator of fruit elongation; low activity at this locus correlates with the characteristic globose, round fruit shape that defines this variety and makes it suitable for stuffing.: produces fruit shape factor
• Cell-wall Invertase 1 (CpInv1) — Encodes a cell-wall bound invertase that cleaves sucrose into glucose and fructose in developing fruit, influencing sugar accumulation and overall sweetness at harvest.: produces glucose, fructose
• MYB Transcription Factor 1 (flavonoid/pigment) (CpMYB1) — Encodes an R2R3-MYB transcription factor that activates flavonoid and carotenoid pigmentation in the exocarp, contributing to the variety's distinctive brilliant yellow skin colour.: produces flavonoids, carotenoids

Metabolic Pathways

• Carotenoid Biosynthesis — activity 70%: Drives brilliant yellow skin colour via lutein and zeaxanthin accumulation; CCD1 cleavage contributes faint floral volatiles to the aroma.
• Terpenoid (MEP) — Sesquiterpenes — activity 38%: Produces (E)-β-caryophyllene as a constitutive defence volatile; emission is suppressed by aphid infestation, potentially reducing flavour complexity under pest pressure.
• Lipoxygenase Pathway — activity 50%: Generates C6 green volatiles (hexanal, Z-3-hexenol) giving raw courgette its characteristic fresh, grassy, cut-vegetable aroma.
• Sugar Metabolism — activity 45%: Invertase-mediated sucrose hydrolysis governs mild sweetness in immature fruit; best flavour achieved at harvest under 200 g.
• Pigmentation Regulation — activity 68%: MYB-driven flavonoid and carotenoid co-regulation produces the variety's defining golden-yellow exocarp; cream-white flesh reflects low mesocarp pigment activity.
• Fruit Shape & Size — activity 15%: Low elongation-pathway activity determines the globe-round fruit form; small seed count and high seed-cavity volume (species literature) make this type ideal for stuffing.

Soil Microbiome Recommendations

• Rhizophagus irregularis — Improved phosphorus uptake supports carotenoid pigment pathway activity, potentially deepening yellow skin colour and fruit fill.
• Funneliformis mosseae — Enhanced mineral nutrition can improve fruit density and mild sweetness at first-quality harvest.
• Bacillus subtilis — Stronger early root system supports vigorous vine growth and more uniform fruit set across the plant.
• Trichoderma harzianum — Reduces risk of damping-off and crown rot in heavier soils, protecting the stand through establishment when soil moisture is high.