| |
|
|
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Amazônia Oriental; Embrapa Cerrados; Embrapa Mandioca e Fruticultura; Embrapa Rondônia; Embrapa Soja; Embrapa Trigo. |
|
Data corrente: |
31/07/1992 |
|
Data da última atualização: |
26/01/2000 |
|
Autoria: |
ESKES, A. B. |
|
Título: |
Incomplete resistance to coffee leaf rust (Hemileia vastatrix). |
|
Ano de publicação: |
1983 |
|
Fonte/Imprenta: |
Wageningen, The Netherlands: Agricultural University of Wageningen, 1983. |
|
Páginas: |
140p. |
|
Idioma: |
Inglês |
|
Notas: |
Doctoral thesis. |
|
Conteúdo: |
Incomplete resistance to coffe leaf rust (Hemileia vastatrix) may be of value in obtaining durable resistance, which is of great importance for the perennial coffee crop. Methods were developed to assess incomplete resistance to coffee leaf rust by illstrated scales ranging from 0 to 09 (Chapter 1). A laboratory screening method, which uses leaf disks, has been standardized. The method is satisfactory for the assessment of complete and incomplete resistance (Chapter 2). Resistance to coffee leaf rust appeared to be affected by light intensity and leaf age (Chapters 3 and 4). In general, however, old leaves were more susceptible than adult or young leaves. From 1976 to 1980, seven new races of H. vastatrix were found in breeding plots in Campinas (Chapter5). Four races overcome combinations of known resistance genes in coffea arabica and three races overcome yet unidentified resistances from C. canephora. Three other rust genotypes were found with intermediate virulence to certain resistance genes. Possibilities for obtaining durable resistance based on major genes are discussed. In Chapters 6, 7 and 8 a characterization is given of incomplete resistance in C. arabica, C. canephora cv. 'Kouillou' and in the 'Icatu' population. Icatu derives from a cross between C. canephora and C. arabica. In C. arabica, the period between the onset of sporulation till leaf abscission (leaf retention period) appeared to be an important determinant of the disease level in the field. Significant variation for latency period and lesion density was observed, but results were fairly inconsistent. Disease level in the field was positively correlated with productivity. In 'Kouillon' large variation for incomplete resistance was found. Genotypes were detected with high resistance expressed by a low lesion density and a quite high reaction type. These genotypes may have value for obtaining durable resistance to coffee leaf rust. Incomplete resistance in Icatu was mainly expressed by heterogeneous reaction types. Components of resistance were related to reaction type. Incomplete resistence of varving degrees was race-specific. In the general discussion the relevance of the findings for coffee breeding and the links to resistance theories are pointed out. MenosIncomplete resistance to coffe leaf rust (Hemileia vastatrix) may be of value in obtaining durable resistance, which is of great importance for the perennial coffee crop. Methods were developed to assess incomplete resistance to coffee leaf rust by illstrated scales ranging from 0 to 09 (Chapter 1). A laboratory screening method, which uses leaf disks, has been standardized. The method is satisfactory for the assessment of complete and incomplete resistance (Chapter 2). Resistance to coffee leaf rust appeared to be affected by light intensity and leaf age (Chapters 3 and 4). In general, however, old leaves were more susceptible than adult or young leaves. From 1976 to 1980, seven new races of H. vastatrix were found in breeding plots in Campinas (Chapter5). Four races overcome combinations of known resistance genes in coffea arabica and three races overcome yet unidentified resistances from C. canephora. Three other rust genotypes were found with intermediate virulence to certain resistance genes. Possibilities for obtaining durable resistance based on major genes are discussed. In Chapters 6, 7 and 8 a characterization is given of incomplete resistance in C. arabica, C. canephora cv. 'Kouillou' and in the 'Icatu' population. Icatu derives from a cross between C. canephora and C. arabica. In C. arabica, the period between the onset of sporulation till leaf abscission (leaf retention period) appeared to be an important determinant of the disease level in the field. Significan... Mostrar Tudo |
|
Palavras-Chave: |
Coffea spp; Coffee; Components of resistance; Durable resistance; Fungal diseases; Idade da folha; Leaf age; Physiologic races; Reaction type; Resistencia a doenca. |
|
Thesagro: |
Café; Coffea Arábica; Doença Fúngica; Ferrugem; Fungo; Hemileia Vastatrix; Iluminação; Melhoramento; Variedade Resistente. |
|
Thesaurus Nal: |
age; Coffea; disease resistance; fungi; leaves; light intensity; lighting. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 03417nam a2200445 a 4500
001 1563872
005 2000-01-26
008 1983 bl uuuu m 00u1 u #d
100 1 $aESKES, A. B.
245 $aIncomplete resistance to coffee leaf rust (Hemileia vastatrix).
260 $aWageningen, The Netherlands: Agricultural University of Wageningen$c1983
300 $a140p.
500 $aDoctoral thesis.
520 $aIncomplete resistance to coffe leaf rust (Hemileia vastatrix) may be of value in obtaining durable resistance, which is of great importance for the perennial coffee crop. Methods were developed to assess incomplete resistance to coffee leaf rust by illstrated scales ranging from 0 to 09 (Chapter 1). A laboratory screening method, which uses leaf disks, has been standardized. The method is satisfactory for the assessment of complete and incomplete resistance (Chapter 2). Resistance to coffee leaf rust appeared to be affected by light intensity and leaf age (Chapters 3 and 4). In general, however, old leaves were more susceptible than adult or young leaves. From 1976 to 1980, seven new races of H. vastatrix were found in breeding plots in Campinas (Chapter5). Four races overcome combinations of known resistance genes in coffea arabica and three races overcome yet unidentified resistances from C. canephora. Three other rust genotypes were found with intermediate virulence to certain resistance genes. Possibilities for obtaining durable resistance based on major genes are discussed. In Chapters 6, 7 and 8 a characterization is given of incomplete resistance in C. arabica, C. canephora cv. 'Kouillou' and in the 'Icatu' population. Icatu derives from a cross between C. canephora and C. arabica. In C. arabica, the period between the onset of sporulation till leaf abscission (leaf retention period) appeared to be an important determinant of the disease level in the field. Significant variation for latency period and lesion density was observed, but results were fairly inconsistent. Disease level in the field was positively correlated with productivity. In 'Kouillon' large variation for incomplete resistance was found. Genotypes were detected with high resistance expressed by a low lesion density and a quite high reaction type. These genotypes may have value for obtaining durable resistance to coffee leaf rust. Incomplete resistance in Icatu was mainly expressed by heterogeneous reaction types. Components of resistance were related to reaction type. Incomplete resistence of varving degrees was race-specific. In the general discussion the relevance of the findings for coffee breeding and the links to resistance theories are pointed out.
650 $aage
650 $aCoffea
650 $adisease resistance
650 $afungi
650 $aleaves
650 $alight intensity
650 $alighting
650 $aCafé
650 $aCoffea Arábica
650 $aDoença Fúngica
650 $aFerrugem
650 $aFungo
650 $aHemileia Vastatrix
650 $aIluminação
650 $aMelhoramento
650 $aVariedade Resistente
653 $aCoffea spp
653 $aCoffee
653 $aComponents of resistance
653 $aDurable resistance
653 $aFungal diseases
653 $aIdade da folha
653 $aLeaf age
653 $aPhysiologic races
653 $aReaction type
653 $aResistencia a doenca
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Cerrados (CPAC) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
| Registros recuperados : 1 | |
| Registros recuperados : 1 | |
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
