Abstract
Upland cotton (Gossypium hirsutum L. genotypes have varying densities of trichomes on the leaves and stems of mature plants, hence their species name. Most modern cotton cultivars are 'smooth' with few if any trichomes. Absence of trichomes reduces the attractiveness of the cotton plant to some major insect pests, reducing reliance on pesticides. A detailed RFLP map was used to map genes affecting density of leaf and stem trichomes. Based on quantitative measures of young and mature leaves, four QTLs were mapped. A QTL on chromosome 6 that imparts dense leaf pubescence is inferred to the t1 locus. A second QTL on chromosome 25, which is homoeologous to chromosome 6, fits the description of the t2 locus. Two additional QTLs, QLP1 and QLP2, explained significant phenotypic variation in leaf pubescence-these may represent the t3, t4 or t5 loci. Some QTLs appeared to be specific to particular developmental stages; for example, QLP1, reduced hairiness only in young leaves while QLP2 increased hairiness in mature leaves. A single locus associated with variation in trichome density on the stem did not correspond to the genes/QTLs affecting leaf trichomes, suggesting that these traits may largely be controlled by different genes. A widely used qualitative classification system for scoring trichome density (DTL) detected only the chromosome 6 locus and was apparently not sensitive enough to detect alleles such as t2 that has smaller phenotypic effects.
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Claims 10
Claim · model-written summary
Four QTLs affecting cotton leaf pubescence were mapped.
- Taxon
- cotton
Gossypium hirsutumt0 - Organ / stage
- young and mature leavese0
- Outcome
- four QTLs were mappede0
- Value
- four QTLse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Based on quantitative measures of young and mature leaves, four QTLs were mapped.”
t0“cotton”
Claim · model-written summary
A chromosome 6 QTL imparts dense leaf pubescence and is inferred to be the t1 locus.
- Taxon
- cottonGossypium hirsutumt0
- Gene
- t1 locuse0
- Outcome
- dense leaf pubescencee0
- Direction
- densee0
- Qualifier
- inferrede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A QTL on chromosome 6 that imparts dense leaf pubescence is inferred to the t1 locus.”
t0“cotton”
Claim · model-written summary
A chromosome 25 QTL fits the description of the t2 locus.
- Taxon
- cottonGossypium hirsutumt0
- Gene
- t2 locuse0
- Outcome
- fits the description of the t2 locuse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A second QTL on chromosome 25, which is homoeologous to chromosome 6, fits the description of the t2 locus.”
t0“cotton”
Claim · model-written summary
QLP1 explained significant variation in cotton leaf pubescence.
- Taxon
- cottonGossypium hirsutumt0
- Gene
- QLP1e0
- Outcome
- phenotypic variation in leaf pubescencee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two additional QTLs, QLP1 and QLP2, explained significant phenotypic variation in leaf pubescence”
t0“cotton”
Claim · model-written summary
QLP2 explained significant variation in cotton leaf pubescence.
- Taxon
- cottonGossypium hirsutumt0
- Gene
- QLP2e0
- Outcome
- phenotypic variation in leaf pubescencee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two additional QTLs, QLP1 and QLP2, explained significant phenotypic variation in leaf pubescence”
t0“cotton”
Claim · model-written summary
QLP1 reduced hairiness only in young cotton leaves.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- young leavese0
- Gene
- QLP1e0
- Outcome
- hairinesse0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“QLP1, reduced hairiness only in young leaves”
t0“cotton”
Claim · model-written summary
QLP2 increased hairiness in mature cotton leaves.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- mature leavese0
- Gene
- QLP2e0
- Outcome
- hairinesse0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“QLP2 increased hairiness in mature leaves”
t0“cotton”
Claim · model-written summary
The stem trichome locus did not correspond to loci affecting cotton leaf trichomes.
- Taxon
- cottonGossypium hirsutumt0
- Gene
- A single locuse0
- Outcome
- variation in trichome density on the steme0
- Comparator
- genes/QTLs affecting leaf trichomese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A single locus associated with variation in trichome density on the stem did not correspond to the genes/QTLs affecting leaf trichomes”
t0“cotton”
Claim · model-written summary
A qualitative trichome density scoring system detected only the chromosome 6 locus.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- detected only the chromosome 6 locuse0
- Value
- chromosome 6e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A widely used qualitative classification system for scoring trichome density (DTL) detected only the chromosome 6 locus”
t0“cotton”
Claim · model-written summary
The DTL scoring system was apparently insufficiently sensitive to detect alleles such as t2 with smaller effects.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- not sensitive enough to detect alleles such as t2e0
- Comparator
- t2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was apparently not sensitive enough to detect alleles such as t2 that has smaller phenotypic effects”
t0“cotton”