Monitoring Colletotrichum Colonization and Reproduction in Different Rubber Tree Clones

Author(s)

Firmino, Ana Carolina ; Magalhaes, Izabela Ponso ; Gomes, Marcela Eloi ; Fischer, Ivan Herman ; Scaloppi Junior, Erivaldo Jose ; Furtado, Edson Luiz

• Document type: Journal article
• Source: PLANTS-BASEL; v. 11, n. 7, p. 13-pg., 2022-04-01.

Abstract

Anthracnose, caused by fungi of the genus Colletotrichum, is present in the major rubber tree crop areas in Brazil, especially in Sao Paulo, Mato Grosso do Sul, Parana, Minas Gerais, Espirito Santo, and northern states. This disease can affect different tissues of the rubber tree, leading to production losses. Thus, a better understanding of the pathosystem Colletotrichum x rubber tree can provide evidence to subsequent epidemiological research and phytosanitary management studies of this disease in the field. The present study aimed to investigate C. tamarilloi colonization and reproduction steps in resistant clones (IAC 502, IAC 507, RRIM 937) and in one susceptible clone (RRIM 600) of the rubber tree, verifying the influence of temperature up to 48 h after inoculation of the fungus, under 24 h wetness. Samples were analyzed under a light, a UV and a scanning electron microscope. Data indicated that the fungus had a delay in its development in resistant clones and, although colonization was expressive 48 h after inoculation, the new spore formation rate in the analyzed samples was lower in resistant clones. For RRIM 600, rapid colonization and intensive sporulation could be observed. (AU)

• FAPESP's process: 17/23927-3 - Characterization and molecular, morpho-cultural, physiological and pathogenic identification of Colletotrichum spp. of rubber tree and induction of resistance of rubber tree to this fungus using saprobic organisms of the northeastern semiarid
• Grantee: Ana Carolina Firmino
• Support Opportunities: Regular Research Grants
• FAPESP's process: 20/11518-4 - Black crust on rubber tree: causal agent, environmental influence on pre-penetration in different rubber tree clones, selection of resistant clones and biological control in susceptible clones
• Grantee: Ana Carolina Firmino
• Support Opportunities: Regular Research Grants