Root characteristic system improves drought tolerance in orchardgrass
| Autor: | Aghafakhr Mirlohi, Mohammad Mahdi Majidi, Mozhgan Abtahi |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Drought tolerance 04 agricultural and veterinary sciences Plant Science Root system Heritability Biology 01 natural sciences Agronomy Dry weight Shoot Genetic variation 040103 agronomy & agriculture Genetics 0401 agriculture forestry and fisheries Dry matter Plant breeding Agronomy and Crop Science 010606 plant biology & botany |
| Zdroj: | Plant Breeding. 136:775-783 |
| ISSN: | 0179-9541 |
| DOI: | 10.1111/pbr.12516 |
| Popis: | Plant genotypes with higher drought tolerance through improved root characteristics are poorly studied in orchardgrass. In the current research, 30 orchardgrass genotypes were polycrossed and the resulting half-sib families evaluated under both normal and water stress environments. Under water stress conditions, values for most root traits decreased at 0–30 cm soil depth, while at 30–60 cm depths, the root length (RL), root area (RA), root volume, percentage of root dry weight (RDW) and the ratio of root to shoot were increased. We identified drought-tolerant genotypes with a high combining ability for root characteristics and a high yield potential. High estimates of heritability as well as genetic variation for root traits indicated that phenotypic selection would be successful in order to achieve genetic progress. Indirect selection to improve dry matter yield was most efficient when selecting for RL and RDW under water stress conditions. Significant associations between a drought tolerance index and RL, RA and root volume confirmed the importance of these traits in conferring drought tolerance of orchardgrass. |
| Databáze: | OpenAIRE |
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