Disabling one color gene in petunias shrinks flowers and disrupts plant growth
Liu F, Jiang T, Tanwir SE, Ardi WH, Huo H
Crispr
Breeders trying to engineer that perfect white or blush petunia for hanging baskets may inadvertently produce smaller, weaker plants if they target DFR without accounting for its ripple effects on growth and chlorophyll.
Researchers used CRISPR to knock out a gene called DFR that helps petunias make red and purple pigments. The edited plants lost most of their flower color as expected, but they also ended up with flowers 20-40% smaller, leaves with half the normal mass, and far less chlorophyll in their petals. This suggests the pigment-making machinery in plants is more deeply tangled with basic growth processes than anyone realized.
Key Findings
CRISPR disruption of DFR reduced floral dimensions by 20-40% and leaf biomass by 30-50%, revealing growth consequences beyond pigment loss.
Chlorophyll and carotenoid levels dropped 35-60% in petals of edited plants, and a key chlorophyll-synthesis gene (PORA) was suppressed by 60-75%.
Transcriptional profiling showed the competing enzyme flavonol synthase (FLS) increased nearly twofold while upstream pathway genes CHSA and CHIA were downregulated, indicating metabolic flux rerouting.
chevron_right Technical Summary
Scientists used CRISPR gene editing to disable a key enzyme in petunia flowers and discovered that disrupting one step in the color-making pathway unexpectedly shrinks flowers, reduces leaf mass, and lowers chlorophyll levels across the whole plant.
Abstract Preview
Original paper
CRISPR/Cas9-mediated DFR disruption suggests coordinated changes in flavonoid flux and development in Petunia × hybrida.
Loss of DFR function in petunia alters pigment metabolism and reduces organ size, suggesting previously underexplored associations among flavonoid biosynthesis, plastidial pigments, and development...
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Crop-improvement refers to the systematic enhancement of plant varieties through selective breeding, genetic modification, and biotechnological approaches to develop cultivars with superior agronomic, nutritional, or environmental traits. This field is essential for addressing global food security,
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