Abstract
Interest in the potential consequences of stratospheric ozone depletion has led to numerous studies that have evaluated the effects of ultraviolet-B (UV-B) radiation on plant growth and productivity. However, few studies have been conducted on plants from natural ecosystems. Differences in solar UV-B radiation along latitudinal or elevational gradients may have resulted in plants from diverse habitats developing contrasting sensitivities to UV-B radiation. In this study, seeds were collected along a 3,000-m elevational gradient in Hawaii and then germinated and grown in an unshaded greenhouse with either no UV-B radiation or one of two daily UV-B irradiances, 15.5 or 23.1 kj m2. Seedlings were grown for 12 weeks and harvested to determine whether UV-B radiation altered plant biomass. The responses to UV-B radiation varied among species, but, in general, sensitivity to UV-B radiation was reduced as the elevation of seed collection increased. Of the 33 species tested, UV-B radiation significantly reduced plant height in 14 species and biomass in eight species. Biomass increased in four species grown under UV-B radiation. This study provides clear evidence that natural plant populations exhibit wide variation in UV-B radiation sensitivity and that this variation is related to the natural (ambient) UV-B radiation environment in which these plants grow.
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Claims 5
Claim · model-written summary
Plant UV-B sensitivity generally decreased as seed-source elevation increased.
- Taxon
- PlantsViridiplantaet0
- Outcome
- sensitivity to UV-B radiatione0
- Direction
- reducede0
- Setting
- elevation of seed collectione0
Verbatim
e0“sensitivity to UV-B radiation was reduced as the elevation of seed collection increased”
t0“Plants from a 3,000-m Elevational Gradient in Hawaii”
Claim · model-written summary
UV-B radiation significantly reduced plant height in 14 of 33 tested species.
- Taxon
- PlantsViridiplantaet0
- Treatment
- UV-B radiatione0
- Outcome
- plant heighte0
- Direction
- reducede0
- Value
- 14 speciese0
Not reportedComparator
Verbatim
e0“Of the 33 species tested, UV-B radiation significantly reduced plant height in 14 species”
t0“Plants from a 3,000-m Elevational Gradient in Hawaii”
Claim · model-written summary
UV-B radiation significantly reduced biomass in eight of 33 tested species.
- Taxon
- PlantsViridiplantaet0
- Treatment
- UV-B radiatione0
- Outcome
- biomasse0
- Direction
- reducede0
- Value
- eight speciese0
Not reportedComparator
Verbatim
e0“Of the 33 species tested, UV-B radiation significantly reduced plant height in 14 species and biomass in eight species”
t0“Plants from a 3,000-m Elevational Gradient in Hawaii”
Claim · model-written summary
Biomass increased under UV-B radiation in four species.
- Taxon
- PlantsViridiplantaet0
- Treatment
- UV-B radiatione0
- Outcome
- Biomasse0
- Direction
- increasede0
- Value
- four speciese0
Not reportedComparator
Verbatim
e0“Biomass increased in four species grown under UV-B radiation”
t0“Plants from a 3,000-m Elevational Gradient in Hawaii”
Claim · model-written summary
Natural plant populations varied widely in UV-B sensitivity in relation to their ambient UV-B environment.
- Taxon
- plante0
- Outcome
- UV-B radiation sensitivitye0
- Setting
- natural (ambient) UV-B radiation environmente0
Not reportedDirection
Verbatim
e0“natural plant populations exhibit wide variation in UV-B radiation sensitivity and that this variation is related to the natural (ambient) UV-B radiation environment in which these plants grow”
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