Endozoochorous dispersal of seeds of weedy rice por bovinos

The objective of this study was to evaluate endozoochory dispersal, recuperation, and germination of weedy rice (Oryza sativa L.) and barnyardgrass (Echinochloa crus-galli L.) seeds passed through the digestive system of cattle. The experiment was divided into two phases: first, the daily seed recup...

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Veröffentlicht in:Ciência rural 2018-08, Vol.48 (8)
Hauptverfasser: Viero, Joao Luis Carricio, Schaedler, Carlos Eduardo, de Azevedo, Eduardo Bohrer, dos Santos, Joao Vitor Ail, de Mello Scalcon, Ricardo, de David, Diego Bitencourt, da Rosa, Fabiane Quevedo
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Sprache:eng
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Zusammenfassung:The objective of this study was to evaluate endozoochory dispersal, recuperation, and germination of weedy rice (Oryza sativa L.) and barnyardgrass (Echinochloa crus-galli L.) seeds passed through the digestive system of cattle. The experiment was divided into two phases: first, the daily seed recuperation rate was determined after passing through the digestive system of six steers. Each animal was dosed individually with 1000 weedy rice seeds and 13,818 barnyardgrass seeds, and these seeds were subsequently collected from feces. In the second phase, seed germination and emergence rate after passing or not passing through the digestive system of cattle were determined in two types of substrates (fecal plaque and soil) in a 2*2 factorial design. Seed recuperation in feces showed sigmoid behavior with maximum recovery on the second day after dosage. The recuperation of the species in the feces was 50.9% and 23.4% for weedy rice and barnyardgrass, respectively, which shows that both have potential endozoochory dispersal. However, seed germination of these species reduced after they passed through the digestive system, and they presented inferior emergence in the fecal plaque compared to the soil. The quarantine period for animals that ingest weedy rice and barnyardgrass seeds should be at least 6 and 7 days, respectively. Key words: endozoochory, feces, paddy rice, seed ingestion, ruminants. O objetivo deste trabalho foi avaliar a dispersao endozoocorica, recuperacao e germinacao de sementes de arroz daninho (Oryza sativa L.) e capim-arroz (Echinochloa crus-galli L.) passadas pelo sistema digestivo de bovinos. O experimento foi dividido em duas fases: primeiramente determinou-se a taxa de recuperacao diaria das sementes apos passagem pelo sistema digestivo de seis bovinos. Foram dosadas individualmente 1000 sementes de arroz daninho e 13818 sementes de capim-arroz para cada animal e posteriormente coletadas nas fezes. Na segunda fase foi determinada a taxa de germinacao e emergencia de sementes com e sem passagem pelo sistema digestivo de bovinos em dois tipos de substratos (placa fecal ou solo) em delineamento fatorial 2x2. A recuperacao de sementes nas fezes apresentou comportamento sigmoide com maxima recuperacao no 2 dia apos dosagem. A recuperacao nas fezes foi de 50,9% e 23,4%, para arroz daninho e capim-arroz, o que demonstra que ambas apresentam potencial de dispersao endozoocorica. Porem, a germinacao de sementes destas especies reduziu ao passar pel
ISSN:0103-8478
DOI:10.1590/0103-8478cr20170650