Key gene identified that controls how Chinese cabbage forms its head
Guo H, Li F, Zhang L, Zhang Y, Cai X
Crop Improvement
Chinese cabbage varieties that fail to head properly, going loose and leafy instead of forming that compact ball you want in the garden, may now be traceable to variation in a single gene, pointing breeders toward a precise fix.
Chinese cabbage is prized for its tight, compact head, but scientists didn't fully understand what drives that process. Researchers found that a gene called BrKAN2 acts as a key switch, coordinating the changes that cause leaves to curl inward and overlap into a head. Disabling the gene scrambled leaf orientation; turning it up in a related plant reshaped its leaves too, confirming BrKAN2 sits at the center of head formation.
Key Findings
Chromatin profiling across developmental stages revealed highly dynamic, stage-specific gene-accessibility patterns tied to leaf heading in Chinese cabbage.
BrKAN2 mutants in Chinese cabbage showed significantly altered leaf morphology and dorsoventral polarity, confirmed by overexpression in a second plant species.
Population genetic analysis detected strong selection on BrKAN2 in heading Brassica rapa varieties, implicating it in the domestication of heading crops.
chevron_right Technical Summary
Scientists mapped gene activity at each stage of Chinese cabbage head formation and identified BrKAN2 as a master regulator controlling how leaves curl inward to create the edible head. The findings give breeders a precise genetic target for improving heading reliability and uniformity in commercial crops.
Abstract Preview
Original paper
Dynamic chromatin accessibility reveals BrKAN2 as a key regulator of Chinese cabbage leaf heading.
Chinese cabbage forms a leafy head as its main edible organ, a process involving extensive morphological and transcriptional changes. Here, we employed ATAC-seq to profile a time-series chromatin a...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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Chinese cabbage is either of two cultivar groups of leaf vegetables often used in Chinese cuisine: the Pekinensis Group and the Chinensis Group.