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| PRABHU,ANNE S.; GUIMARÃES,ELCIO P.; FILIPPI,MARTA C.; ARAUJO,LEILA G.; CUTRIM,VERIDIANO A.. |
| Thirty-nine rice (Oryza sativa) hybrids and their restorers were assessed for vertical resistance to Pyricularia grisea in the rice blast nursery, and in artificial inoculation tests with two pathotypes, under controlled greenhouse conditions. The hybrids were developed from cytoplasmic genetic male sterile lines 046I and IR 58025A, derived from WA cytoplasm. In the rice blast nursery all hybrids showed susceptible reaction varying from 5 to 9. Compatible and incompatible leaf blast reactions of hybrids to two pathotypes, IC-1 and IB-45, were observed in inoculation tests. A majority of the hybrids were resistant when the restorer was resistant. However, seven of the 25 F1 hybrids exhibited susceptible reactions even when one of the parents was resistant... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Magnaporthe grisea; Rice blast; Hybrid rice; Partial resistance; Oryza sativa. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582002000500003 |
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| PRABHU,ANNE S.; FILIPPI,MARTA C.; ARAUJO,LEILA G.. |
| A study was undertaken to examine the pathogenic diversity of Pyricularia grisea isolates retrieved from 14 upland rice (Oryza sativa) cultivars in experimental plots during a period of five years. Inoculations were performed on 32 genotypes with 85 monoconidial isolates under controlled greenhouse conditions. Based on the reaction pattern of eight international differentials, eleven pathotypes of P. grisea were identified. The predominant international races or pathotypes were IB-9 (56.4%), IB-1 (16.4%) and IB-41 (11.8%). A set of eight commercial upland rice cultivars ('Carajás', 'Confiança', 'Maravilha', 'Primavera', 'Progresso', 'Caiapó', 'IAC-47', 'IAC-201') was utilized as additional differentials for describing the virulence pattern of P. grisea.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Magnaporthe grisea; Physiologic races; Differential varieties; Resistance; Virulence. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582002000500005 |
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| ARAÚJO,LEILA G.; PRABHU,ANNE S.. |
| Foram conduzidos experimentos de campo por três anos utilizando somaclones da cultivar de arroz (Oriza sativa) de terras altas IAC 47. A variação para resistência à brusone e para outras características agronômicas foram avaliadas nas gerações avançadas de R5, R6 e R7. O progresso lento da brusone foi medido baseado na área sob a curva de progresso de doença (ASCPD) e taxa aparente de infecção (r). As correlações nas gerações R6 e R7 em relação a ASCPD e r foram positivas e altamente significantes. Os somaclones também mostraram dois tipos distintos de plantas, um com folha ereta verde escura e outro com folha decumbente verde-amarela, arquiteturas diferentes do tipo de planta da cultivar IAC 47, a qual é caracterizada por folha decumbente verde-palha.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cultura de tecidos; Epidemiologia; Oryza sativa; Pyricularia grisea. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582001000300005 |
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