Symbioses: Plant, Animal, and Microbe Interactions
Violi, Helen A. , Barrientos-Priego, Alejandro F. , Escamilla-Prado, Esteban , Ploetz, Randy C. , Lovatt, Carol , Menge, John A. .
Persea survival and growth in Veracruz, Mexico in areas invaded by Phytophthora cinnamomi and P. citricola.
THE genus Persea (Clus.) Miller is a member of the ancient, Gondwanan plant family, Lauraceae. Two subgenera are recognized in Persea, Eriodaphne (found primarily in South America) and Persea (MesoAmerica). Subgenus Persea contains three species, all of which are components of native forest communities in the Mexican state of Veracruz. P. americana Mill. and P. schiedeana Nees are most important, but are threatened by deforestation and limited opportunities for establishment. Diverse causes are responsible for the later situation, only some of which are understood. We examined as factors nonendemic members of the plant-pathogenic genus Phytophthora. In surveys of pastures and mature forests in Veracruz two invasive species, Ph. cinnamomi and Ph. citricola, were widespread. They are native to the Eastern hemisphere and were probably introduced to Veracruz with commercial selections of avocado (taxa of P. americana). Experiments were conducted to examine the impact of the Phytophthora spp., arbuscular mycorrhizal fungi (AMF) and light on the growth and survival of the Persea spp. Survival of P. schiedeana was lowest in soil from pastures that contained both Ph. cinnamomi and Ph. citricola and highest in soil treated with a soil filtrate that did not contain AMF and Phytophthora. Surprisingly, growth of surviving seedlings of P. schiedeana was greatest in pasture soil under low light. In subsequent work, P. schiedeana and two varieties of P. americana all grew better under low light. When a combination of a chemical control measure for Phytophthora (potassium phosphonate) and NPK fertilizer were tested, significant increases in growth occurred in pasture and mature forest soils, but not in plants treated with the soil filtrate.
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1 - University of Florida, Plant Pathology (Tropical Research and Education Center), PO Box 111569, Homestead, Florida, 330313314, USA
2 - Universidad Autónoma Chapingo, Deptartmento de Fitotecnia, Chapingo, Mexico, , Mexico
3 - Universidad Autónoma Chapingo, Centro Regional Universitario Oriente, Huatusco, Veracruz, , México
4 - University of California Riverside, Department of Botany & Plant Sciences, Riverside, California, 92521-0124, USA
5 - University of California Riverside, Plant Pathology, Riverside, California, 92521, USA
Presentation Type: Poster:Posters for Topics
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM