scholarly journals Role of ascospores and conidia in the initiation and spread of South American leaf blight in a rubber tree plantation

2013 ◽  
Vol 63 (3) ◽  
pp. 510-518 ◽  
Author(s):  
J. Guyot ◽  
V. Condina ◽  
F. Doaré ◽  
C. Cilas ◽  
I. Sache
Keyword(s):  
Rubber Tree ◽  
Leaf Blight ◽  
South American ◽  
Tree Plantation

scholarly journals Development parameters of the latent period as a response of rubber tree resistance to South American leaf blight

2021 ◽  
Vol 47 (2) ◽  
pp. 103-109
Author(s):  
João Alberto Zago Bevenuto ◽  
José Raimundo de Souza Passos ◽  
Edson Luiz Furtado
Keyword(s):  
Latent Period ◽  
Rubber Tree ◽  
Leaf Blight ◽  
Slight Variation ◽  
South American ◽  
Infection Frequency ◽  
Breeding Programs ◽  
Lesion Diameter ◽  
Complete Resistance ◽  
Traditional Breeding

ABSTRACT The major phytosanitary problem for rubber tree cultivation in Brazil is the disease known as South American leaf blight, caused by the fungus Microcyclus ulei. Its symptoms manifest in young leaves and cause intense defoliation, resulting in reduced latex production and even the death of susceptible plants. Thus, this disease consists in a constant threat to East Asian plantations. As worldwide traditional breeding programs have evolved, interspecific hybrid clones have currently been used for planting. They are more productive and show better resistance to pathogens. However, traditional breeding programs have not led to significant progress in resistance to South American leaf blight since the selection is directed to clones with complete resistance. In this pathosystem, horizontal or partial resistance (HR) and vertical or complete resistance (VR) can act simultaneously, evidencing their complexity and difficult quantification. This study aimed to: characterize the foliar lesion type in Hevea sp. X M. ulei pathosystem; verify the clonal susceptibility to pathogens; analyze the infection frequency for resistance quantification in Hevea sp. x M. ulei pathosystem, and recommend differentiating rubber tree clones to quantify M. ulei races in Brazil. The monocyclic parameters (latent period and lesion diameter) are applicable for resistance quantification in Hevea sp. x M. ulei pathosystem. Latent period had slight variation among clones. Lesion diameter had wide variation among clones and was a discriminating parameter for horizontal resistance and vertical resistance.

Molecular mapping of genes conferring field resistance to South American Leaf Blight (Microcyclus ulei) in rubber tree

2003 ◽  
Vol 108 (1) ◽  
pp. 160-167 ◽  
Author(s):  
V. Le Guen ◽  
D. Lespinasse ◽  
G. Oliver ◽  
M. Rodier-Goud ◽  
F. Pinard ◽  
...  
Keyword(s):  
Molecular Mapping ◽  
Rubber Tree ◽  
Field Resistance ◽  
Leaf Blight ◽  
South American ◽  
Microcyclus Ulei

Long-term resistance in promising rubber tree genotypes as a breeding source for improving South American leaf blight management under high disease incidence in the Colombian Amazon

2021 ◽  
pp. 105817
Author(s):  
Armando Sterling ◽  
Gustavo Adolfo Pimentel-Parra ◽  
Yeny Rocío Virguez-Díaz ◽  
Yerson Dubán Suárez-Córdoba ◽  
Juan Diego Hoyos-Duarte ◽  
...  
Keyword(s):  
Disease Incidence ◽  
Rubber Tree ◽  
Leaf Blight ◽  
South American ◽  
Colombian Amazon

Assessing growth, early yielding and resistance in rubber tree clones under low South American Leaf Blight pressure in the Amazon region, Colombia

2020 ◽  
Vol 158 ◽  
pp. 112958
Author(s):  
Armando Sterling ◽  
Eidy Janeth Martínez-Viuche ◽  
Yerson Dubán Suárez-Córdoba ◽  
Ariel Antonio Agudelo-Sánchez ◽  
Jesica Andrea Fonseca-Restrepo ◽  
...  
Keyword(s):  
Rubber Tree ◽  
Amazon Region ◽  
Leaf Blight ◽  
South American

scholarly journals Assessment of rubber tree panels under crowns resistant to South American leaf blight

2011 ◽  
Vol 46 (5) ◽  
pp. 466-473 ◽  
Author(s):  
Larissa Alexandra Cardoso Moraes ◽  
Adônis Moreira ◽  
José Roberto Antoniol Fontes ◽  
Everton Rabelo Cordeiro ◽  
Vicente Haroldo de Figueiredo Moraes
Keyword(s):  
Nutritional Status ◽  
Rubber Tree ◽  
Leaf Blight ◽  
Physiological Characteristics ◽  
Yield Potential ◽  
South American ◽  
Efficient Technology ◽  
Simultaneous Evaluation ◽  
Microcyclus Ulei ◽  
Selection Of

The objective of this work was to assess the performance of panel clones under crowns resistant to South American leaf blight (Microcyclus ulei). The experiment was carried out with 18 panel clones crown-budded with Hevea pauciflora x H. guianensis, in a Xanthic Ferralsol (Oxisol) in Manaus, AM, Brazil. The following parameters were evaluated: dry rubber yield, plant nutritional status, and anatomical and physiological characteristics of the latex vessels. In the first three years of evaluation, the panel clones IAN 2878, IAN 2903, CNS AM 7905, CNS AM 7905 P1, and PB 28/59 showed the highest dry rubber yield potential, while the clones IAN 6158, IAN 6590, and IAN 6515 should not be recommended for crown budding. Higher potassium and copper foliar content in panel clones were associated to an increase in dry rubber yield. The simultaneous evaluation of anatomical and physiological characteristics of latex is fundamental for the selection of panel clones in the Amazon region. Crown budding is an efficient technology for South American leaf blight management in endemic regions.

scholarly journals Differential expression and structural polymorphism in rubber tree genes related to South American leaf blight resistance

2020 ◽  
Vol 110 ◽  
pp. 101477
Author(s):  
Paula Cristina da Silva Angelo ◽  
Michel Eduardo Beleza Yamagishi ◽  
Jeferson Chagas da Cruz ◽  
Gilvan Ferreira da Silva ◽  
Luadir Gasparotto
Keyword(s):  
Differential Expression ◽  
Rubber Tree ◽  
Leaf Blight ◽  
Blight Resistance ◽  
South American ◽  
Structural Polymorphism
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