ArticleAnnals of botany2025
Rice cycles between drought and well-watered-adapted phenotypes by changing lateral root formation.
Article in Annals of botany, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- Understanding the genetics of root system architecture in pigeonpea [Cajanus cajan (L.) Millsp.].TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik · 2026Article
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7 authors.
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Abstract
BACKGROUND AND
aimsNatural rainfed conditions present drought episodes interspersed with periods of moderate to high soil moisture levels. This study investigates the genetic variation in root-to-shoot growth in response to a wet-drought-wet cycle and aims to identify rice (Oryza sativa) lines differing in drought recovery, focusing on detailed root trait investigations.
methodsIn total, 100 different rice accessions were screened under fluctuating moisture across three field seasons for GWAS (genome-wide association study) analysis. In a subset of 20 genotypes, crown root number and leaf length were recorded regularly to calculate a water recovery index (WRI). Two lines contrasting in WRI were grown in a glasshouse experiment to resolve detailed root phenotypes in simulated field drought and re-watering. KEY
resultsGWAS co-locations indicated drought recovery-associated loci that included candidate genes previously reported for several abiotic stressors. In the subset of 20 genotypes, crown root growth was impacted most by the transition from drought to re-watering. The calculated WRI distinguishes different responses to drought and re-watering. A glasshouse study reproduced the contrasting growth of two selected lines, with 'ADT 12' shoot and root growth being strongly impaired by drought, while 'ARC 18202' growth was not suppressed. Drought caused a significant decrease in S-type lateral root production in both lines, while a significant increase in L-type lateral root proportion was only found for 'ADT 12'. These phenotypes were reversed 7 d after re-watering to values of the well-watered control plants.
conclusionsOverall, in-depth root phenotyping confirmed the drought-resistance and recovery ability of 'ARC 18202' in the field and highlighted the importance of S-type and L-type lateral root formation already under well-watered conditions prior to drought. 'ARC 18202' had a higher amount of thick lateral roots before drought and, therefore, less change in lateral root formation under drought and re-watering conditions.
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