Abstract
This work aimed to evaluate the effect that different intensities of light have on the physiological attributes of red rice seeds and seedlings. Before and after emergence, seedlings were exposed to light levels of 35%; 65% and 100% in a greenhouse. We evaluated shoots and roots, in terms of length and dry mass, as well as leaf area and content of chlorophyll (a,b and total). In leaves and roots, we quantified the activity of superoxide dismutase (SOD), ascorbate peroxidase (APX), catalase (CAT) and guaiacol peroxidase (POX). We determined the leaf area ratio (F A), leaf mass ratio (F W), specific leaf area (S A), and shoot/root ratio (P W). At higher light intensities, shoot length decreased, whereas root length, dry mass and number of tillers increased. Leaf area was greatest in seedlings exposed to a 65% light level. The F A, F W, S A and P W were lowest at a light intensity of 100%. Differences in light intensity had qualitative and quantitative effects on chlorophyll contents. The activity of SOD and CAT was higher at lower light levels, whereas the inverse was true for APX and POX activity. Extremes of light availability alter the activity of antioxidant enzymes, negatively affecting the initial growth characteristics and photosynthetic pigments of red rice seedlings.
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Claims 12
Claim · model-written summary
Shoot length decreased at higher light intensities.
Not reportedComparator
Verbatim
e0“At higher light intensities, shoot length decreased”
t0“red rice”
Claim · model-written summary
Root length increased at higher light intensities.
Not reportedComparator
Verbatim
e0“At higher light intensities, shoot length decreased, whereas root length, dry mass and number of tillers increased”
t0“red rice”
Claim · model-written summary
Dry mass increased at higher light intensities.
Not reportedComparator
Verbatim
e0“At higher light intensities, shoot length decreased, whereas root length, dry mass and number of tillers increased”
t0“red rice”
Claim · model-written summary
Tiller number increased at higher light intensities.
Not reportedComparator
Verbatim
e0“At higher light intensities, shoot length decreased, whereas root length, dry mass and number of tillers increased”
t0“red rice”
Claim · model-written summary
Leaf area was greatest at 65% light.
Not reportedComparator
Verbatim
e0“Leaf area was greatest in seedlings exposed to a 65% light level”
t0“red rice”
Claim · model-written summary
Leaf area ratio, leaf mass ratio, specific leaf area and shoot/root ratio were lowest at 100% light.
Not reportedComparator
Verbatim
e0“The F A, F W, S A and P W were lowest at a light intensity of 100%”
t0“red rice”
Claim · model-written summary
Light intensity had qualitative and quantitative effects on chlorophyll contents.
Not reportedComparatorDirection
Verbatim
e0“Differences in light intensity had qualitative and quantitative effects on chlorophyll contents”
t0“red rice”
Claim · model-written summary
SOD activity was higher at lower light levels.
Not reportedComparator
Verbatim
e0“The activity of SOD and CAT was higher at lower light levels”
t0“red rice”
Claim · model-written summary
CAT activity was higher at lower light levels.
Not reportedComparator
Verbatim
e0“The activity of SOD and CAT was higher at lower light levels”
t0“red rice”
Claim · model-written summary
APX activity showed the inverse light response to SOD and CAT.
Not reportedTreatmentComparatorDirection
Verbatim
e0“the inverse was true for APX and POX activity”
t0“red rice”
Claim · model-written summary
POX activity showed the inverse light response to SOD and CAT.
Not reportedTreatmentComparatorDirection
Verbatim
e0“the inverse was true for APX and POX activity”
t0“red rice”
Claim · model-written summary
Extremes of light availability negatively affected initial growth and photosynthetic pigments.
- Taxon
- red ricee0
- Treatment
- Extremes of light availabilitye0
- Outcome
- initial growth characteristics and photosynthetic pigmentse0
- Direction
- negatively affectinge0
Not reportedComparator
Verbatim
e0“Extremes of light availability alter the activity of antioxidant enzymes, negatively affecting the initial growth characteristics and photosynthetic pigments of red rice seedlings”