Osmotic adjustment in maize cultivated in different soil tillage systems and water availability
Maize is a very sensible crop to water deficit, which is a frequent cause of reduction in its grain yield. The objective of this work was to verify the occurrence of osmotic adjustment in maize cultivated in different soil management systems and water availability. The maize was cropped in no-tillage (NT) and conventional tillage (CT), with irrigation and no-irrigation. For measurements of minimum leaf water potential, a pressure chamber was utilized. Osmotic adjustment was calculated as the difference between osmotic potentials at full turgor, in irrigated and non-irrigated plants. Highest values of minimum leaf water potential were found in plants cropped in NT, as a response to the highest soil potential on this cropping system. Pressure potential and the osmotic potential at full turgor were reduced as a response to water deficit, resulting on an osmotic adjustment in both cropping systems, with a highest intensity in the CT system. Minimum leaf water potential showed sensitivity to water deficit, which makes it a good indicator of plant water status on maize. Maize crop showed tolerance to water deficit through the mechanism of osmotic adjustment.
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Pesquisa Agropecuaria Brasileira
2005
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rev-pab-br-article-70072014-09-22T17:01:53Z Osmotic adjustment in maize cultivated in different soil tillage systems and water availability Ajuste osmótico em milho cultivado em diferentes sistemas de manejo de solo e disponibilidade hídrica Bianchi, Cleusa Adriane Menegassi Bergonci, João Ito Bergamaschi, Homero Dalmago, Genei Antonio Zea mays; leaf water potential; water deficit; no-tillage Zea mays; potencial de água na folha; déficit hídrico; plantio direto Maize is a very sensible crop to water deficit, which is a frequent cause of reduction in its grain yield. The objective of this work was to verify the occurrence of osmotic adjustment in maize cultivated in different soil management systems and water availability. The maize was cropped in no-tillage (NT) and conventional tillage (CT), with irrigation and no-irrigation. For measurements of minimum leaf water potential, a pressure chamber was utilized. Osmotic adjustment was calculated as the difference between osmotic potentials at full turgor, in irrigated and non-irrigated plants. Highest values of minimum leaf water potential were found in plants cropped in NT, as a response to the highest soil potential on this cropping system. Pressure potential and the osmotic potential at full turgor were reduced as a response to water deficit, resulting on an osmotic adjustment in both cropping systems, with a highest intensity in the CT system. Minimum leaf water potential showed sensitivity to water deficit, which makes it a good indicator of plant water status on maize. Maize crop showed tolerance to water deficit through the mechanism of osmotic adjustment. A cultura do milho é sensível ao déficit hídrico, e esta é uma causa freqüente de redução na produção de grãos. O objetivo deste trabalho foi verificar a ocorrência de ajuste osmótico em milho, cultivado em dois sistemas de manejo do solo, com diferentes disponibilidades hídricas. Os tratamentos consistiram do cultivo do milho em semeadura direta (SD) e convencional (SC), com irrigação de forma a manter a umidade do solo próxima à capacidade de campo, e sem irrigação. O ajuste osmótico foi obtido pela diferença do potencial osmótico hidratado entre as plantas irrigadas e sem irrigação. Os maiores valores de potencial mínimo de água na folha ocorreram em plantas cultivadas sob SD, em razão do maior potencial matricial da água no solo nesse sistema. O potencial de pressão e o osmótico hidratado diminuíram em conseqüência do déficit hídrico, o que determinou a ocorrência de ajuste osmótico em ambos os sistemas, que foi mais intenso em manejo convencional. Portanto, o potencial mínimo de água na folha demonstra ser um indicador adequado da condição hídrica das plantas de milho. A cultura apresenta tolerância ao déficit hídrico por meio do mecanismo de ajuste osmótico. Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira 2005-07-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://seer.sct.embrapa.br/index.php/pab/article/view/7007 Pesquisa Agropecuaria Brasileira; v.40, n.7, jul. 2005; 645-651 Pesquisa Agropecuária Brasileira; v.40, n.7, jul. 2005; 645-651 1678-3921 0100-104x por https://seer.sct.embrapa.br/index.php/pab/article/view/7007/4055 |
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Bianchi, Cleusa Adriane Menegassi Bergonci, João Ito Bergamaschi, Homero Dalmago, Genei Antonio |
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Bianchi, Cleusa Adriane Menegassi Bergonci, João Ito Bergamaschi, Homero Dalmago, Genei Antonio Osmotic adjustment in maize cultivated in different soil tillage systems and water availability |
| author_facet |
Bianchi, Cleusa Adriane Menegassi Bergonci, João Ito Bergamaschi, Homero Dalmago, Genei Antonio |
| author_sort |
Bianchi, Cleusa Adriane Menegassi |
| title |
Osmotic adjustment in maize cultivated in different soil tillage systems and water availability |
| title_short |
Osmotic adjustment in maize cultivated in different soil tillage systems and water availability |
| title_full |
Osmotic adjustment in maize cultivated in different soil tillage systems and water availability |
| title_fullStr |
Osmotic adjustment in maize cultivated in different soil tillage systems and water availability |
| title_full_unstemmed |
Osmotic adjustment in maize cultivated in different soil tillage systems and water availability |
| title_sort |
osmotic adjustment in maize cultivated in different soil tillage systems and water availability |
| description |
Maize is a very sensible crop to water deficit, which is a frequent cause of reduction in its grain yield. The objective of this work was to verify the occurrence of osmotic adjustment in maize cultivated in different soil management systems and water availability. The maize was cropped in no-tillage (NT) and conventional tillage (CT), with irrigation and no-irrigation. For measurements of minimum leaf water potential, a pressure chamber was utilized. Osmotic adjustment was calculated as the difference between osmotic potentials at full turgor, in irrigated and non-irrigated plants. Highest values of minimum leaf water potential were found in plants cropped in NT, as a response to the highest soil potential on this cropping system. Pressure potential and the osmotic potential at full turgor were reduced as a response to water deficit, resulting on an osmotic adjustment in both cropping systems, with a highest intensity in the CT system. Minimum leaf water potential showed sensitivity to water deficit, which makes it a good indicator of plant water status on maize. Maize crop showed tolerance to water deficit through the mechanism of osmotic adjustment. |
| publisher |
Pesquisa Agropecuaria Brasileira |
| publishDate |
2005 |
| url |
https://seer.sct.embrapa.br/index.php/pab/article/view/7007 |
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