Abstract
Stratospheric ozone depletion has caused an increase in the amount of ultraviolet-B (UV-B) radiation reaching the earth's surface. Numerous investigations have demonstrated that the effect of UV-B enhancements on plants includes reduction in grain yield, alteration in species competition, susceptibility to disease and changes in plant structure and pigmentation. Many experiments examining UV-B radiation effects on plants have been conducted in growth chambers or greenhouses. It has been questioned whether the effect of UV-B radiation on plants can be extrapolated to field responses from indoor studies because of the unnaturally high ratios of UV-B/ultraviolet-A radiation (320-400 nm) and UV-B/photosynthetically active radiation (PAR) in many indoor studies. Field studies on UV-B radiation effect on plants have been recommended to use the UV and PAR irradiance provided by natural light. This study reports the growth and yield responses of a maize crop exposed to enhanced UV-B radiation and the UV-B effects on maize seed qualities under field conditions. Enhanced UV-B radiation caused a significant reduction in the dry matter accumulation and the maize yield in turn was affected. With increased UV-B radiation the flavonoid accumulation in maize leaves increased and the contents of chlorophyll a, b and (a + b) of maize leaves were reduced. The levels of protein, sugar and starch of maize seed decreased with enhanced UV-B radiation, whereas the level of lysine increased with enhanced UV-B radiation.
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Claims 6
Claim · model-written summary
Enhanced UV-B significantly reduced dry matter accumulation.
Zea maysNot reportedComparatorSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Enhanced UV-B radiation caused a significant reduction in the dry matter accumulation”
e1“maize crop”
Claim · model-written summary
Enhanced UV-B affected maize yield.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the maize yield in turn was affected”
e1“Enhanced UV-B radiation”
e2“under field conditions”
Claim · model-written summary
Increased UV-B increased flavonoid accumulation in maize leaves.
- Organ / stage
- leavese0
- Treatment
- increased UV-B radiatione0
- Outcome
- flavonoid accumulatione0
- Direction
- increasede0
- Setting
- field conditionse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With increased UV-B radiation the flavonoid accumulation in maize leaves increased”
e1“under field conditions”
Claim · model-written summary
UV-B reduced chlorophyll a, b and (a + b) in maize leaves.
- Organ / stage
- leavese0
- Treatment
- increased UV-B radiatione1
- Outcome
- contents of chlorophyll a, b and (a + b)e0
- Direction
- reducede0
- Setting
- field conditionse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the contents of chlorophyll a, b and (a + b) of maize leaves were reduced”
e1“increased UV-B radiation”
e2“under field conditions”
Claim · model-written summary
Enhanced UV-B decreased maize seed protein, sugar and starch levels.
- Organ / stage
- seede0
- Treatment
- enhanced UV-B radiatione0
- Outcome
- levels of protein, sugar and starche0
- Direction
- decreasede0
- Setting
- field conditionse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The levels of protein, sugar and starch of maize seed decreased with enhanced UV-B radiation”
e1“under field conditions”
Claim · model-written summary
Enhanced UV-B increased lysine level in maize seed.
- Organ / stage
- seede1
- Treatment
- enhanced UV-B radiatione0
- Outcome
- level of lysinee0
- Direction
- increasede0
- Setting
- field conditionse2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the level of lysine increased with enhanced UV-B radiation”
e1“protein, sugar and starch of maize seed”
e2“under field conditions”
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