Effect of pythium spp. and fusarium oxysporum in the soybeans cultivars archer and hutcheson

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UNIVERSIDADE ESTADUAL PAULISTA

CAMPUS DE BOTUCATU

FACULDADE DE CIÊNCIAS AGRONÔMICAS







“Effect of Pythium spp. and Fusarium oxysporum in the soybeans cultivars Archer and Hutcheson”











NAME OF THE STUDENT: Larissa Lozano Teixeira de Carvalho

NAME OF THE ADVISOR: Prof. Dr. Carlos Alexandre Costa Crusciol

NAME OF THE SUPERVISOR: Dr. John Rupe

NAME OFTHE INSTITUTION: University of Arkansas





Report of the Intership, accomplished the University of Arkansas, Fayetteville, Arkansas, United States of America.







Botucatu-SP

2009

UNIVERSIDADE ESTADUAL PAULISTA

CAMPUS DE BOTUCATU

FACULDADE DE CIÊNCIAS AGRONÔMICAS







Report of the Intership, accomplished the University of Arkansas, Fayetteville, Arkansas,United States of America.









Larissa Lozano Teixeira de Carvalho









Advisor: Prof. Dr. Carlos Alexandre Costa Crusciol

Supervisor: Dr. John Rupe









Botucatu-SP

2009

Carvalho, L. L. T. “Effect of Pythium spp. and Fusarium oxysporum in the soybean cultivars Archer and Hutcheson” - University of Arkansas, 2009. 42f.

Report of theIntership, accomplished the University of Arkansas, Fayetteville, Arkansas, United States of America.













































Acknowledgements



First, I would like to thank the sponsors of my scholarship (Adair Scholarship) because it gave me financial conditions to be here. I would like to thank my advisor, Dr. John Rupe forwelcome here, for his attention and besides it, for his patience. I would like to thank Dr. Rothrock for his advisement and all plant pathology department for welcome very pleasantly and friendly, for the attention and friendship. I would like to give a special thanks to Valeria, Keiddy and Adele, who were always helpful, especially in the beginning of this project; if not for them, this projectwould not be completed. I would like to thank God for giving me courage and protection and life. I would like to thank my family for giving me conditions and support all the time and for their love and dedication. I would like to thank my boyfriend Júlio for understanding, love and patience.



































Author: Larissa Lozano Teixeira deCarvalho



Title: “Effect of Pythium spp. and Fusarium oxysporum in the soybean cultivar Archer and Hutcheson”



Advisor: Prof. Dr. Carlos Alexandre Costa Crusciol



Degree: Agronomy Year: 2009



Abstract: The state of Arkansas is one of the principal producing soybean (Glicine max L. Merril) of the United States. Seedling diseases are very important forsoybean; in Arkansas seedling diseases losses is 5%. Seedling diseases can reduce soybean seed germination, seedling emergence and stands vigor leading to lower yields. Several pathogens are associated with seedling diseases, among them Fusarium spp, and Pythium spp.. However, little quantitative information is available concerning the effects of these pathogens on root system structure. This workhad two objectives; the first one was to report how Pythium spp. and Fusarium oxysporum influence germination and root development in the soybean cultivar Hutcheson and Archer, and the second one was to determine the role of seeds exudates in resistant soybean cultivar to Pythium spp.. Pythium aphanidermatum affected stand but, did not affect root growth, compared to the control. Fusariumoxysporum, on the other hand, reduced both stands and root growth. Fusarium had smaller roots, had fewer branches and plants were less complex than control. When seeds exudates from Archer (resistant soybean genotype) were applied on P. aphanidermatum, were observed shorter spaces between branches and shorter colony diameter than seeds exudates from Hutcheson (susceptible soybean genotype). This...
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