Architectural Root Responses of Rice to Reduced Water Availability Can Overcome Phosphorus Stress
| Autor: | Roel Merckx, Pieterjan De Bauw, Elke Vandamme, Leah Mwakasege, Allen Lupembe, Kalimuthu Senthilkumar |
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| Rok vydání: | 2019 |
| Předmět: |
phosporus uptake efficiency
0106 biological sciences Root growth Drought stress chemistry.chemical_element root architecture water availability Biology 01 natural sciences lcsh:Agriculture Crop root thickness Nutrient lateral rooting Phosphorus Lateral root lcsh:S phosphorus uptake efficiency food and beverages 04 agricultural and veterinary sciences Root branching Agronomy chemistry Shoot 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Agronomy and Crop Science root plasticity 010606 plant biology & botany |
| Zdroj: | Agronomy, Vol 9, Iss 1, p 11 (2018) Agronomy Volume 9 Issue 1 |
| Popis: | © 2018 by the authors. Drought and low phosphorus (P) availability are major limitations for rainfed rice production. Crop roots are important for soil resource acquisition and tolerance to P and water limitations. Two pot and two field trials were conducted to evaluate architectural root responses of contrasting rice varieties to combinations of different levels of P (deficient to non-limiting) and water availability (water stressed to submergence) and to identify the interactions with different varieties. Root development was then related to drought and/or low P tolerance. Although shoot and root growth responded more to P than to water availability, architectural root responses to water were much more prominent than responses to P availability. Reduced water availability decreased nodal thickness and increased secondary root branching, both factors partially enhancing P uptake efficiency and even overcoming a decreased root:shoot ratio under reduced water availability. In contrast to root thickness and secondary branching, basal lateral root density was strongly determined by variety and was related to enhanced P uptake. Reduced water availability induces root modifications which—apart from enhancing drought resilience—also affect P uptake efficiency. Future research on rice roots and nutrient uptake may hence take into account the large effects of water on root development. ispartof: AGRONOMY-BASEL vol:9 issue:1 status: published |
| Databáze: | OpenAIRE |
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