Abstract
The effects of artificial biologically effective UV-B radiation on a range of growth and physiological parameters in two cotton (Gossypium hirsutum L.) cultivars (Romanos and Allegria) were recorded. Three levels of biologically effective UV-B were used: (1) zero (2) ambient and (3) elevated (determined as that associated with a notional 15% depletion of stratospheric ozone). Plants were grown under artificial light in growth chambers and subjected to the biologically effective UV-B radiation treatments. Compared to the zero level, the ambient and elevated biologically effective UV-B radiation significantly reduced plant height, leaf chlorophyll content, net photosynthetic rate, stomatal conductance, bract length, petal length, anthers number, pollen germination, seed cotton weight, fibre strength, fibre elongation, fibre micronaire, fibre maturity index, fibre spinning consistency index, mean fibre length, fibre yellowness and fibre uniformity index. Both the ambient and the elevated UV-B radiation also significantly increased stomatal density, short fibre index and fibre reflectance. Key words: UV-B radiation, cotton, photosynthesis, stomatal density, flower characteristics, pollen germination, seed cotton weight, fibre quality.
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Claims 10
Claim · model-written summary
Ambient and elevated UV-B significantly reduced plant height relative to zero UV-B.
- Taxon
- cotton
Gossypium hirsutumt0 - Treatment
- ambient and elevated biologically effective UV-B radiatione0
- Outcome
- plant heighte0
- Direction
- reducede0
- Comparator
- zero levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to the zero level, the ambient and elevated biologically effective UV-B radiation significantly reduced plant height, leaf chlorophyll content, net photosynthetic rate, stomatal conductance, bract length, petal length, anthers number, pollen germination, seed cotton weight, fibre strength, fibre elongation, fibre micronaire, fibre maturity index, fibre spinning consistency index, mean fibre length, fibre yellowness and fibre uniformity index.”
t0“cotton”
Claim · model-written summary
Ambient and elevated UV-B significantly reduced leaf chlorophyll content, net photosynthetic rate, stomatal conductance relative to zero UV-B.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- ambient and elevated biologically effective UV-B radiatione0
- Outcome
- leaf chlorophyll content, net photosynthetic rate, stomatal conductancee0
- Direction
- reducede0
- Comparator
- zero levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to the zero level, the ambient and elevated biologically effective UV-B radiation significantly reduced plant height, leaf chlorophyll content, net photosynthetic rate, stomatal conductance, bract length, petal length, anthers number, pollen germination, seed cotton weight, fibre strength, fibre elongation, fibre micronaire, fibre maturity index, fibre spinning consistency index, mean fibre length, fibre yellowness and fibre uniformity index.”
t0“cotton”
Claim · model-written summary
Ambient and elevated UV-B significantly reduced bract length, petal length, anthers number relative to zero UV-B.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- ambient and elevated biologically effective UV-B radiatione0
- Outcome
- bract length, petal length, anthers numbere0
- Direction
- reducede0
- Comparator
- zero levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to the zero level, the ambient and elevated biologically effective UV-B radiation significantly reduced plant height, leaf chlorophyll content, net photosynthetic rate, stomatal conductance, bract length, petal length, anthers number, pollen germination, seed cotton weight, fibre strength, fibre elongation, fibre micronaire, fibre maturity index, fibre spinning consistency index, mean fibre length, fibre yellowness and fibre uniformity index.”
t0“cotton”
Claim · model-written summary
Ambient and elevated UV-B significantly reduced pollen germination relative to zero UV-B.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- ambient and elevated biologically effective UV-B radiatione0
- Outcome
- pollen germinatione0
- Direction
- reducede0
- Comparator
- zero levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to the zero level, the ambient and elevated biologically effective UV-B radiation significantly reduced plant height, leaf chlorophyll content, net photosynthetic rate, stomatal conductance, bract length, petal length, anthers number, pollen germination, seed cotton weight, fibre strength, fibre elongation, fibre micronaire, fibre maturity index, fibre spinning consistency index, mean fibre length, fibre yellowness and fibre uniformity index.”
t0“cotton”
Claim · model-written summary
Ambient and elevated UV-B significantly reduced seed cotton weight relative to zero UV-B.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- ambient and elevated biologically effective UV-B radiatione0
- Outcome
- seed cotton weighte0
- Direction
- reducede0
- Comparator
- zero levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to the zero level, the ambient and elevated biologically effective UV-B radiation significantly reduced plant height, leaf chlorophyll content, net photosynthetic rate, stomatal conductance, bract length, petal length, anthers number, pollen germination, seed cotton weight, fibre strength, fibre elongation, fibre micronaire, fibre maturity index, fibre spinning consistency index, mean fibre length, fibre yellowness and fibre uniformity index.”
t0“cotton”
Claim · model-written summary
Ambient and elevated UV-B significantly reduced fibre strength, fibre elongation, fibre micronaire relative to zero UV-B.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- ambient and elevated biologically effective UV-B radiatione0
- Outcome
- fibre strength, fibre elongation, fibre micronairee0
- Direction
- reducede0
- Comparator
- zero levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to the zero level, the ambient and elevated biologically effective UV-B radiation significantly reduced plant height, leaf chlorophyll content, net photosynthetic rate, stomatal conductance, bract length, petal length, anthers number, pollen germination, seed cotton weight, fibre strength, fibre elongation, fibre micronaire, fibre maturity index, fibre spinning consistency index, mean fibre length, fibre yellowness and fibre uniformity index.”
t0“cotton”
Claim · model-written summary
Ambient and elevated UV-B significantly reduced fibre maturity index, fibre spinning consistency index, mean fibre length relative to zero UV-B.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- ambient and elevated biologically effective UV-B radiatione0
- Outcome
- fibre maturity index, fibre spinning consistency index, mean fibre lengthe0
- Direction
- reducede0
- Comparator
- zero levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to the zero level, the ambient and elevated biologically effective UV-B radiation significantly reduced plant height, leaf chlorophyll content, net photosynthetic rate, stomatal conductance, bract length, petal length, anthers number, pollen germination, seed cotton weight, fibre strength, fibre elongation, fibre micronaire, fibre maturity index, fibre spinning consistency index, mean fibre length, fibre yellowness and fibre uniformity index.”
t0“cotton”
Claim · model-written summary
Ambient and elevated UV-B significantly reduced fibre yellowness and fibre uniformity index relative to zero UV-B.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- ambient and elevated biologically effective UV-B radiatione0
- Outcome
- fibre yellowness and fibre uniformity indexe0
- Direction
- reducede0
- Comparator
- zero levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to the zero level, the ambient and elevated biologically effective UV-B radiation significantly reduced plant height, leaf chlorophyll content, net photosynthetic rate, stomatal conductance, bract length, petal length, anthers number, pollen germination, seed cotton weight, fibre strength, fibre elongation, fibre micronaire, fibre maturity index, fibre spinning consistency index, mean fibre length, fibre yellowness and fibre uniformity index.”
t0“cotton”
Claim · model-written summary
Both the ambient and the elevated UV-B radiation also significantly increased stomatal density, short fibre index and fibre reflectance.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- ambient and the elevated UV-B radiatione0
- Outcome
- stomatal densitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both the ambient and the elevated UV-B radiation also significantly increased stomatal density, short fibre index and fibre reflectance.”
t0“cotton”
Claim · model-written summary
Both the ambient and the elevated UV-B radiation also significantly increased stomatal density, short fibre index and fibre reflectance.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- ambient and the elevated UV-B radiatione0
- Outcome
- short fibre index and fibre reflectancee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both the ambient and the elevated UV-B radiation also significantly increased stomatal density, short fibre index and fibre reflectance.”
t0“cotton”
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