CmBt and CmBr synergistically regulate cucurbitacin B biosynthesis in melon.
Wang S, Zhao X, Wang X, Wang M, Wang C
Crispr
Melon breeders now have a precise genetic target to eliminate the mouth-puckering bitterness that occasionally ruins an otherwise perfect harvest—whether you grow them in a backyard garden or buy them at a farmers market.
Melons can taste bitter because of a chemical they naturally produce, and scientists discovered two genetic 'on switches' that control where and how much of that chemical gets made—one mainly in leaves, one mainly in fruit and roots. When researchers used a gene-editing tool to turn off both switches at once, the melons became far less bitter than when only one switch was turned off. This also stopped a plant-growth chemical sometimes used in farming from accidentally making fruits taste terrible.
Key Findings
Knocking out both CmBt and CmBr together caused a more severe reduction in cucurbitacin B across all tissues (fruit, leaves, roots) than either single knockout alone, confirming synergistic interaction.
CmBt was redefined as a leaf-predominant regulator and CmBr as a fruit/root-predominant regulator—reversing or refining previous understanding of their roles.
The double mutant (CmbtCmbr) completely prevented CPPU-induced fruit bitterness, a significant practical outcome for commercial melon production.
chevron_right Technical Summary
Researchers identified two genetic switches that control bitterness in melon and showed they work together in a tissue-specific way. By knocking out both genes using CRISPR, they produced melons with dramatically reduced bitterness—even blocking the chemical-induced bitterness that sometimes ruins fruit quality.
Abstract Preview
Cucurbitacin B (CuB) is the primary compound responsible for bitterness in melon (Cucumis melo L.) and negatively affects fruit quality and consumer acceptance. Although CuB biosynthesis is regulat...
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A melon is any of various plants of the family Cucurbitaceae with sweet, edible, and fleshy fruit. It can also specifically refer to Cucumis melo, commonly known as the "true melon" or simply "melon". The term "melon" can apply to both the plant and its fruit. Botanically, a melon is a kind of be...