Abstract
Cotton ( Gossypium hirsutum L.) grown in reduced light environments produces inferior fiber compared with that produced in abundant sunlight environments. This response to low light suggests that insufficient photosynthetic assimilates are the cause of the fiber quality reductions. The primary objective of this research was to determine how fiber carbohydrates respond to varying levels of sunlight during development. A field study was conducted from 1995 to 1997 in which cotton was exposed to two light regimes during reproductive growth: (i) incident sunlight and (ii) 70% of incident sunlight achieved with shade cloth. Samples of fiber, ovules, and leaves subtending the boll were collected at 0, 14, 21, and 35 d post anthesis (DPA) and analyzed for starch, glucose, fructose, and sucrose. Fiber quality was determined at the end of the season. With some exceptions, the shade treatment reduced carbohydrates levels in the leaf and ovule tissue. At 14 DPA, starch was reduced 29% in fiber grown under shade. Sucrose levels in shade fiber was reduced 31% at 21 DPA. The carbohydrate reductions at 14 and 21 DPA occurred during a period of fiber development when strength is determined. These carbohydrate reductions parallel the 3% fiber strength reductions seen with low light. The reduced sucrose levels at 21 DPA induced by the shade also occur during fiber secondary cell wall deposition and match the lower fiber micronaire produced under shade. These data present compelling evidence that adequate carbon assimilates are required to produce fiber quality approaching genetic maximums.
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Claims 5
Claim · model-written summary
Shade generally reduced carbohydrates in cotton leaf and ovule tissue.
- Taxon
- Cotton
Gossypium hirsutume1 - Organ / stage
- leaf and ovule tissuee0
- Treatment
- shade treatmente0
- Outcome
- carbohydrates levelse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With some exceptions, the shade treatment reduced carbohydrates levels in the leaf and ovule tissue.”
e1“Cotton ( Gossypium hirsutum L.) grown in reduced light environments”
Claim · model-written summary
Shade reduced fiber starch by 29% at 14 DPA.
- Taxon
- CottonGossypium hirsutume1
- Organ / stage
- fibere0
- Treatment
- shadee0
- Outcome
- starche0
- Direction
- reducede0
- Value
- 29%e0
- Qualifier
- 14 DPAe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 14 DPA, starch was reduced 29% in fiber grown under shade.”
e1“Cotton ( Gossypium hirsutum L.) grown in reduced light environments”
Claim · model-written summary
Shade reduced fiber sucrose by 31% at 21 DPA.
- Taxon
- CottonGossypium hirsutume1
- Organ / stage
- fibere0
- Treatment
- shadee0
- Outcome
- Sucrose levelse0
- Direction
- reducede0
- Value
- 31%e0
- Qualifier
- 21 DPAe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sucrose levels in shade fiber was reduced 31% at 21 DPA.”
e1“Cotton ( Gossypium hirsutum L.) grown in reduced light environments”
Claim · model-written summary
Low light reduced cotton fiber strength by 3%.
- Taxon
- CottonGossypium hirsutume1
- Treatment
- low lighte0
- Outcome
- fiber strengthe0
- Direction
- reductionse0
- Value
- 3%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the 3% fiber strength reductions seen with low light.”
e1“Cotton ( Gossypium hirsutum L.) grown in reduced light environments”
Claim · model-written summary
Shade lowered fiber micronaire.
- Taxon
- CottonGossypium hirsutume1
- Treatment
- shadee0
- Outcome
- fiber micronairee0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lower fiber micronaire produced under shade.”
e1“Cotton ( Gossypium hirsutum L.) grown in reduced light environments”
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See all 7 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.