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The complete sequence office hoja blanca virus (RHBV) RNA4 has been determined, based on the sequence of the corresponding eDNA clones. RNA4 consists of 1991 nucleotides with two open reading frames (ORFs). One putative ORF is located in the 5'-proximal region of the viral RNA4; it encodes a prot...


Ramírez, B.C.Lozano Potes, IConstantino, LMHaenni, AL[Complete nucleotide sequence and coding strategy of rice hoja blanca virus RNA4]Complete nucleotide sequence and coding strategy of rice hoja blanca virus RNA4

We determined DNA fingerprints and pathotypes on international differentials for 151 isolates of the rice blast fungus Pyricularia grisea that were collected from 15 rice cultivars at a blast disease breeding nursery in Santa Rosa, Colombia. The pathogen population expressed an extraordinarily hi...


Levy, MCorrea Victoria, Fernando J.Zeigler, Robert S.Xu, SHamer, JE[Genetic diversity of the rice blast fungus in a disease nursery in Colombia]Genetic diversity of the rice blast fungus in a disease nursery in Colombia

Functional properties of normal and waxy starches from maize, rice, potato, and cassava as well as the modified waxy maize starch COLFLO 67 were compared. The main objective of this study is to position the recently discovered spontaneous mutation for amylose-free cassava starch in relation to th...


Sánchez, T.Dufour, D.L.Moreno, I.X.Ceballos, H.[Comparison of pasting and gel stabilities of waxy and normal starches from potato, maize, and rice with those of a novel waxy cassava starch under thermal, chemical, and mechanical stress]Comparison of pasting and gel stabilities of waxy and normal starches from potato, maize, and rice with those of a novel waxy cassava starch under thermal, chemical, and mechanical stress

Adding biochar to soils and maintaining high earthworm biomasses are potential ways to increase the fertility of tropical soils and the sustainability of crop production in the spirit of agroecology and ecological engineering. However, a thorough functional assessment of biochar effect on plant g...


Noguera, DRondón, Marco AntonioLaossi, KRHoyos Villegas, V.Lavelle, Patrick M.Carvalho, M.H.C. deBarot, S[Contrasted effect of biochar and earthworms on rice growth and resource allocation in different soils]Contrasted effect of biochar and earthworms on rice growth and resource allocation in different soils

The present work was conducted to identify microsatellite markers linked to the rice blast resistance gene Pi-1(t) for a marker-assisted selection program. Twenty-four primer pairs corresponding to 19 microsatellite loci were selected from the Gramene database (www. gramene.org) considering their...


Fuentes, JLCorrea Victoria, Fernando J.Escobar, F.Prado Patiño, G.A.Aricapa, María GirlenaDuque E., Myriam CristinaTohme, Joseph M.[Identification of microsatellite markers linked to the blast resistance gene Pi-1(t) in rice]Identification of microsatellite markers linked to the blast resistance gene Pi-1(t) in rice

The purpose of the present study was to evaluate the use of infrared thermometry in the characterization of inter specific (Oryza glaberrima x Oryza sativa cv Caiapó) and intra specific upland rice lines for drought tolerance. The experiment, carried out at Porangatu in the State of Goiás, was su...


Guimaraes, CMStone, LFLorieux, MOliveira, J.P. deAlencar, GDias, R.A.A.[Infrared thermometry for drought phenotyping of inter and intra specific upland rice lines]Infrared thermometry for drought phenotyping of inter and intra specific upland rice lines

Background: Bacterial leaf blight causes significant yield losses in rice crops throughout Asia and Africa. Although both the Asian and African strains of the pathogen, Xanthomonas oryzae pv. oryzae (Xoo), induce similar symptoms, they are nevertheless genetically different, with the African stra...


Soto Suárez, M.Bernal, D.González, C.Szurek, BGuyot, RTohme, Joseph M.Verdier, Valérie[In planta gene expression analysis of Xanthomonas oryzae pathovar oryzae, African strain MAI1]In planta gene expression analysis of Xanthomonas oryzae pathovar oryzae, African strain MAI1

Panicle blight of rice, caused by Burkholderia glumae, has been a serious problem on rice in Japan since 1955. It has been reported from other rice-producing countries around the world and recently was reported on rice in the southern United States (2). A rice producer in Panama contacted us to v...


Nandakumar, RRush, MCCorrea Victoria, Fernando J.[Association of Burkholderia glumae and B. gladioli with panicle blight symptoms on rice in Panama]Association of Burkholderia glumae and B. gladioli with panicle blight symptoms on rice in Panama

Many types of symptoms associated with discolored grain have been observed on rice (Oryza sativa) sheaths, leaves, and grain in Mexico, Guatemala, Panama, Surinam, Colombia, Peru, and Brazil. These include brown necrotic lesions ranging from small specks to large brown to maroon sheath blotches. ...


Zeigler, Robert S.Álvarez, E.[Bacterial sheath brown rot of rice caused by Pseudomonas fuscovaginae in Latin America]Bacterial sheath brown rot of rice caused by Pseudomonas fuscovaginae in Latin America

In Venezuela, pedigree analyses indicate that the rice varieties currently under cultivation are closely related. Effective breeding programs, based on knowledge of the genetic diversity of cultivars, are needed to broaden the genetic bases of rice germplasm in the country. In this study, we used...


Ghneim-Herrera, ThauraPosso Duque, DPérez Almeida, I.Torrealba N., G.T.Pieters, AJMartínez Racines, César PompilioTohme, Joseph M.[Assessment of genetic diversity in Venezuelan rice cultivars using simple sequence repeats markers]Assessment of genetic diversity in Venezuelan rice cultivars using simple sequence repeats markers

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