Seed vigor, antioxidant metabolism and initial growth characteristics of red rice seedlings under different light intensities
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...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Sociedade Botânica do Brasil
2013-06-01
|
| Series: | Acta Botânica Brasílica |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000200007&lng=en&tlng=en |
| _version_ | 1818559387797553152 |
|---|---|
| author | Tiago Zanatta Aumonde Tiago Pedó Junior Borella Luciano do Amarante Francisco Amaral Villela |
| author_facet | Tiago Zanatta Aumonde Tiago Pedó Junior Borella Luciano do Amarante Francisco Amaral Villela |
| author_sort | Tiago Zanatta Aumonde |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-14T00:24:51Z |
| format | Article |
| id | doaj.art-c868ef0ce4cc4de1bd8228a3ab7db77d |
| institution | Directory Open Access Journal |
| issn | 1677-941X |
| language | English |
| last_indexed | 2024-12-14T00:24:51Z |
| publishDate | 2013-06-01 |
| publisher | Sociedade Botânica do Brasil |
| record_format | Article |
| series | Acta Botânica Brasílica |
| spelling | doaj.art-c868ef0ce4cc4de1bd8228a3ab7db77d2022-12-21T23:25:06ZengSociedade Botânica do BrasilActa Botânica Brasílica1677-941X2013-06-0127231131710.1590/S0102-33062013000200007S0102-33062013000200007Seed vigor, antioxidant metabolism and initial growth characteristics of red rice seedlings under different light intensitiesTiago Zanatta Aumonde0Tiago Pedó1Junior Borella2Luciano do Amarante3Francisco Amaral Villela4Universidade Federal de PelotasUniversidade Federal de PelotasUniversidade Federal de PelotasUniversidade Federal de PelotasUniversidade Federal de PelotasThis 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.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000200007&lng=en&tlng=enOryza sativa L.shadingchlorophyll contentantioxidant enzymes |
| spellingShingle | Tiago Zanatta Aumonde Tiago Pedó Junior Borella Luciano do Amarante Francisco Amaral Villela Seed vigor, antioxidant metabolism and initial growth characteristics of red rice seedlings under different light intensities Acta Botânica Brasílica Oryza sativa L. shading chlorophyll content antioxidant enzymes |
| title | Seed vigor, antioxidant metabolism and initial growth characteristics of red rice seedlings under different light intensities |
| title_full | Seed vigor, antioxidant metabolism and initial growth characteristics of red rice seedlings under different light intensities |
| title_fullStr | Seed vigor, antioxidant metabolism and initial growth characteristics of red rice seedlings under different light intensities |
| title_full_unstemmed | Seed vigor, antioxidant metabolism and initial growth characteristics of red rice seedlings under different light intensities |
| title_short | Seed vigor, antioxidant metabolism and initial growth characteristics of red rice seedlings under different light intensities |
| title_sort | seed vigor antioxidant metabolism and initial growth characteristics of red rice seedlings under different light intensities |
| topic | Oryza sativa L. shading chlorophyll content antioxidant enzymes |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000200007&lng=en&tlng=en |
| work_keys_str_mv | AT tiagozanattaaumonde seedvigorantioxidantmetabolismandinitialgrowthcharacteristicsofredriceseedlingsunderdifferentlightintensities AT tiagopedo seedvigorantioxidantmetabolismandinitialgrowthcharacteristicsofredriceseedlingsunderdifferentlightintensities AT juniorborella seedvigorantioxidantmetabolismandinitialgrowthcharacteristicsofredriceseedlingsunderdifferentlightintensities AT lucianodoamarante seedvigorantioxidantmetabolismandinitialgrowthcharacteristicsofredriceseedlingsunderdifferentlightintensities AT franciscoamaralvillela seedvigorantioxidantmetabolismandinitialgrowthcharacteristicsofredriceseedlingsunderdifferentlightintensities |