Inheritance of Root Characters and Their Relations to Drought Resistance in Rice
The ability of rice plants to tolerate drought stresses is associated with root system characters. However, the genetics of root traits are not well understood. Hence, the inheritance of six root characters of rice (Oryza sativa L.) was studied using the parents, F1, F2, and F3 populations of the cr...
| Autores principales: | , , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
Wiley
1985
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/167772 |
| _version_ | 1855521479901315072 |
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| author | Ekanayake, I.J. O'Toole, J.C. Garrity, D.P. Masajo, T.M. |
| author_browse | Ekanayake, I.J. Garrity, D.P. Masajo, T.M. O'Toole, J.C. |
| author_facet | Ekanayake, I.J. O'Toole, J.C. Garrity, D.P. Masajo, T.M. |
| author_sort | Ekanayake, I.J. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | The ability of rice plants to tolerate drought stresses is associated with root system characters. However, the genetics of root traits are not well understood. Hence, the inheritance of six root characters of rice (Oryza sativa L.) was studied using the parents, F1, F2, and F3 populations of the cross IR20✕MGL‐2. Plants were grown in a hydroponic culture solution in a phytotron glasshouse and in an upland drought screening nursery. A polygenic system of inheritance was indicated for the root characters. The F1 plants had root systems characterized by thick, deep roots with a higher lateral and vertical distribution than the low parent (IR20), and the heterosis was significant and positive. The additive and dominant genetic effects contributed equally to the expression of all root traits. Both progeny parent regression of F3 and F2, and the narrow sense heritability estimates in F3 were high for root thickness (0.61 and 0.80), root dry weight (0.56 and 0.92) and root length density (0.44 0.77). Selection of root types, based on individual plant performance, should be successful in early segregating generations if selection is practiced on these characters. Associations between root characters and plant height, tiller number, and shoot weight were positive and significant. Five root characters were significantly correlated with the visual field drought resistance scores and with leaf water potential, confirming the role of root characters in maintaining high leaf water potential under water stress. |
| format | Journal Article |
| id | CGSpace167772 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1985 |
| publishDateRange | 1985 |
| publishDateSort | 1985 |
| publisher | Wiley |
| publisherStr | Wiley |
| record_format | dspace |
| spelling | CGSpace1677722025-05-14T10:39:37Z Inheritance of Root Characters and Their Relations to Drought Resistance in Rice Ekanayake, I.J. O'Toole, J.C. Garrity, D.P. Masajo, T.M. inheritance root characters drought resistance The ability of rice plants to tolerate drought stresses is associated with root system characters. However, the genetics of root traits are not well understood. Hence, the inheritance of six root characters of rice (Oryza sativa L.) was studied using the parents, F1, F2, and F3 populations of the cross IR20✕MGL‐2. Plants were grown in a hydroponic culture solution in a phytotron glasshouse and in an upland drought screening nursery. A polygenic system of inheritance was indicated for the root characters. The F1 plants had root systems characterized by thick, deep roots with a higher lateral and vertical distribution than the low parent (IR20), and the heterosis was significant and positive. The additive and dominant genetic effects contributed equally to the expression of all root traits. Both progeny parent regression of F3 and F2, and the narrow sense heritability estimates in F3 were high for root thickness (0.61 and 0.80), root dry weight (0.56 and 0.92) and root length density (0.44 0.77). Selection of root types, based on individual plant performance, should be successful in early segregating generations if selection is practiced on these characters. Associations between root characters and plant height, tiller number, and shoot weight were positive and significant. Five root characters were significantly correlated with the visual field drought resistance scores and with leaf water potential, confirming the role of root characters in maintaining high leaf water potential under water stress. 1985-11 2024-12-19T12:57:41Z 2024-12-19T12:57:41Z Journal Article https://hdl.handle.net/10568/167772 en Wiley Ekanayake, I. J.; O'Toole, J. C.; Garrity, D. P. and Masajo, T. M. 1985. Inheritance of Root Characters and Their Relations to Drought Resistance in Rice. Crop Science, Volume 25 no. 6 p. 927-933 |
| spellingShingle | inheritance root characters drought resistance Ekanayake, I.J. O'Toole, J.C. Garrity, D.P. Masajo, T.M. Inheritance of Root Characters and Their Relations to Drought Resistance in Rice |
| title | Inheritance of Root Characters and Their Relations to Drought Resistance in Rice |
| title_full | Inheritance of Root Characters and Their Relations to Drought Resistance in Rice |
| title_fullStr | Inheritance of Root Characters and Their Relations to Drought Resistance in Rice |
| title_full_unstemmed | Inheritance of Root Characters and Their Relations to Drought Resistance in Rice |
| title_short | Inheritance of Root Characters and Their Relations to Drought Resistance in Rice |
| title_sort | inheritance of root characters and their relations to drought resistance in rice |
| topic | inheritance root characters drought resistance |
| url | https://hdl.handle.net/10568/167772 |
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