Dynamic analysis of resistance in Colombian elite Hevea brasiliensis genotypes as a breeding strategy for enhancing South American leaf blight management under disease non-escape conditions in the Amazon region

South American Leaf Blight (SALB) is the primary limitation to the establishment of new rubber ( Hevea brasiliensis ) crops in Latin America. This study aimed to assess the temporal dynamics of resistance to SALB in 99 elite Colombian genotypes and the IAN 873 cultivar (control) of H. brasiliensis i...

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Bibliographic Details
Published in:European journal of plant pathology 2024-07, Vol.169 (3), p.447-459
Main Authors: Galindo-Rodríguez, Lyda Constanza, Sterling, Armando, Muñoz-Ramirez, Herminton, Martínez-Moyano, Edgar, Fonseca-Restrepo, Jesica Andrea, Loaiza-Molina, Luis Carlos
Format: Article
Language:English
Subjects:
Agricultural production
Agriculture
Biomedical and Life Sciences
Blight
Cloning
Cultivars
Disease
Disease resistance
Ecology
Genotypes
Germplasm
Hevea brasiliensis
Leaf area
Leaf blight
Life Sciences
Plant breeding
Plant Pathology
Plant Sciences
Precipitation
Rubber
Signs and symptoms
South American leaf blight
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Summary:South American Leaf Blight (SALB) is the primary limitation to the establishment of new rubber ( Hevea brasiliensis ) crops in Latin America. This study aimed to assess the temporal dynamics of resistance to SALB in 99 elite Colombian genotypes and the IAN 873 cultivar (control) of H. brasiliensis in small-scale clone trials conducted under conditions with a high disease prevalence in the northwestern Colombian Amazon. Resistance monitoring was carried out on a monthly basis and analyzed over five climatic periods. Three variables were recorded: attack severity (AT, ranging from 0 to 4), reaction type (TR, ranging from 1 to 6) and stromal density (ST, ranging from 0 to 4). The maximum scores for TR and ST were used to classify the level of resistance of the genotypes. Highly significant differences in the mean values of AT, TR and ST among the genotypes, across the periods, and in the interaction between genotype and period were found. Over time, an increase in symptoms (AT) and signs (TR and ST) of SALB was observed. During the rainy periods, SALB intensity was highest, resulting in a leaf area affected ranging from 16 to 30%. Eight genotypes showed partial resistance (PR) (TR 
ISSN:0929-1873
1573-8469
DOI:10.1007/s10658-024-02840-1