Abstract
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 aize 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 reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“Enhanced UV‐B radiation caused a significant reduction in the dry matter accumulation”
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
t0“Maize”
e0“Enhanced UV‐B radiation caused a significant reduction in the dry matter accumulation and the maize yield in turn was affected”
Claim · model-written summary
Increasing UV-B increased maize leaf flavonoid accumulation.
- Treatment
- increased UV‐B radiatione0
- Outcome
- flavonoid accumulation in maize leavese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“With increased UV‐B radiation the flavonoid accumulation in maize leaves increased”
Claim · model-written summary
Increasing UV-B reduced maize leaf chlorophyll a, b, and total chlorophyll.
- Treatment
- increased UV‐B radiatione0
- Outcome
- contents of chlorophyll a , b and ( a + b ) of maize leavese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“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”
Claim · model-written summary
Enhanced UV-B decreased maize seed protein, sugar, and starch.
- Treatment
- enhanced UV‐B radiatione0
- Outcome
- levels of protein, sugar and starch of maize seede0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“The levels of protein, sugar and starch of maize seed decreased with enhanced UV‐B radiation”
Claim · model-written summary
Enhanced UV-B increased maize seed lysine.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Maize”
e0“the level of lysine increased with enhanced UV‐B radiation”
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See all 6 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.