Analysis Version
v1
History
Back to Study: From landrace to modern hybrid broccoli: the genom...
descriptive
Analysis v1
0
Pro
37
Against

A specific spot on broccoli’s 9th chromosome — which controls when it flowers and how it handles heat — has been heavily selected by breeders, making it a key target for improvement.

Scientific Claim

The chromosome 9 region near 47–49 Mb contains genes associated with flowering time and heat tolerance and shows strong signals of selection in modern broccoli hybrids.

Original Statement

“This terminal chromosome 9 region has been shown to harbor homologs of flowering and chilling requirement genes TLF2, COL1, CO, and FLC... We identified a strong Fst region (chr9:47.4–48.9) that contained 236 A. thaliana homologs including CO (Bo9g163730) and COL1 (Bo9g163720).”

From study:From landrace to modern hybrid broccoli: the genomic and morphological domestication syndrome within a diverse B. oleracea collection.

Evidence Quality Assessment

Claim Status

appropriately stated

Study Design Support

Design supports claim

Appropriate Language Strength

association

Can only show association/correlation

Assessment Explanation

The claim describes genomic patterns and gene associations observed in the data without asserting causation. 'Contains' and 'shows' are appropriate for observational findings.

Evidence from Studies

Supporting (0)

0
No supporting evidence found

Contradicting (1)

37
37

From landrace to modern hybrid broccoli: the genomic and morphological domestication syndrome within a diverse B. oleracea collection.

Cross-Sectional Study

The study shows that modern broccoli has changed a lot due to breeding, but it doesn’t say anything about the exact spot on chromosome 9 or genes for flowering and heat tolerance, so we can’t confirm that part of the claim.

Source Study

From landrace to modern hybrid broccoli: the genomic and morphological domestication syndrome within a diverse B. oleracea collection.

Score: 37
DOI: 10.1038/s41438-020-00375-0

Similar Assertions

The DNA of modern broccoli has more A and T building blocks than older types — a pattern also seen in corn and soybeans, likely from long-term breeding.

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The broccoli we buy in stores today has much less genetic variety than the old-fashioned types grown in southern Italy, meaning farmers have lost a lot of natural diversity by breeding for uniformity.

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Scientists found 53 spots in the broccoli genome where genetic variation has been wiped out — likely because breeders picked plants with certain traits so often that other versions disappeared.

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Sprouting broccoli has way more unique genetic variants than store-bought broccoli, making it a treasure trove for breeders trying to add new traits.

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Modern broccoli’s genes stay linked together over much longer stretches of DNA than in purple cauliflower, meaning breeders have been mating very similar plants for generations.

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