scholarly journals Effect of Field Resistance on Leaf Blast Development in Mixtures of Susceptible and Resistant Rice Cultivars.

1994 ◽  
Vol 60 (5) ◽  
pp. 585-594 ◽  
Author(s):  
Shinzo KOIZUMI
Keyword(s):  
Field Resistance ◽  
Rice Cultivars ◽  
Leaf Blast

scholarly journals Genetic Analysis of Field Resistance to Leaf Blast (Pyricularia oryzae) in Rice

1978 ◽  
Vol 28 (4) ◽  
pp. 277-286 ◽  
Author(s):  
Tadaaki HIGASHI ◽  
Kinya KUSHIBUCHI
Keyword(s):  
Genetic Analysis ◽  
Field Resistance ◽  
Pyricularia Oryzae ◽  
Leaf Blast

scholarly journals Use of local rice cultivars as additional differentials to identify pathotypes of Pyricularia oryzae

Bragantia ◽  
2011 ◽  
Vol 70 (4) ◽  
pp. 860-868 ◽  
Author(s):  
Gisele Barata da Silva ◽  
Leila Garcês de Araújo ◽  
Valácia Lemes da Silva Lobo ◽  
Anne Sitarama Prabhu ◽  
Marcela Cristiane Ferreira Rêgo ◽  
...  
Keyword(s):  
Culture Collection ◽  
Pyricularia Oryzae ◽  
Rice Cultivars ◽  
Leaf Blast ◽  
Irrigated Rice ◽  
Resistant Cultivars ◽  
Virulence Pattern ◽  
Bean Research ◽  
Complementary Set ◽  
Pathogenic Diversity

Eight additional rice cultivars as differentials were selected to identify pathotypes occurring in the Tocantins State. They were BRS Jaburu, BRS Taim, BRS Biguá, BR IRGA-417, Epagri 109, Javaé, Metica-1 and Supremo. These differentials were used in addition to the international set to determine the pathogenic diversity of 193 Pyricularia oryzae isolates collected during 1994-2002 from irrigated rice cultivars. They were conserved in Pyricularia culture collection of Embrapa Rice and Bean Research center. From 193 P. oryzae isolates 38 pathotypes were identified based on leaf blast reactions of international set and 29 pathotypes based on these additional differentials. The predominant pathotypes (TI-1, TG-2, TD-15 and TF-2) were represented by 53% of the tested isolates. The major international pathotypes (IB-45, IB-41, II-1 and ID-13) were represented by 43% of the isolates tested. The virulence pattern of 28 isolates belonging to the pathotype IB-45 was further differentiated into nine local pathotypes using additional set of differentials. The irrigated rice cultivars used as additional differentials serve as complementary set to identify pathotypes of interest for breeding blast resistant cultivars for Tocantins State.

scholarly journals Effect of Furrow Irrigation on the Severity of False Smut in Susceptible Rice Varieties

Plant Disease ◽  
2010 ◽  
Vol 94 (5) ◽  
pp. 570-574 ◽  
Author(s):  
Steven A. Brooks ◽  
Merle M. Anders ◽  
Kathleen M. Yeater
Keyword(s):  
Agricultural Practices ◽  
Rice Cultivar ◽  
Effective Field ◽  
Field Resistance ◽  
Southern United States ◽  
Rice Cultivars ◽  
Rice Varieties ◽  
Irrigated Rice ◽  
Ustilaginoidea Virens ◽  
False Smut

False smut (Ustilaginoidea virens) is an important emerging disease of rice (Oryza sativa) in the southern United States, where all major rice cultivars and hybrids are susceptible to the disease. False smut susceptibility was evaluated in traditional paddy-rice fields and under furrow-irrigated conditions to determine the effects of alternative agricultural practices on the severity of this disease. Highly effective false smut suppression was observed in furrow-irrigated rice, where the disease was nearly eliminated in susceptible rice entries. False smut suppression was observed for two hybrids and one conventional rice cultivar, demonstrating that suppression was not limited to specific germplasm sources. Kernel smut severity was also monitored, but no effect on this disease was observed from the irrigation treatments. Therefore, suppression of disease severity in nonflooded rice appears to be a phenomenon unique to the rice–false smut pathosystem, which can be exploited to achieve effective field resistance to this disease.

scholarly journals Lipoxygenase activity in Brazilian rice cultivars with variable resistance to leaf blast disease

Bragantia ◽  
2007 ◽  
Vol 66 (1) ◽  
pp. 27-30 ◽  
Author(s):  
Sardul Singh Sandhu ◽  
Paulo Mazzafera ◽  
Luiz Ernesto Azini ◽  
Cândido Ricardo Bastos ◽  
Carlos Augusto Colombo
Keyword(s):  
Enzyme Activity ◽  
Positive Relationship ◽  
Lipoxygenase Activity ◽  
Blast Disease ◽  
Rice Cultivars ◽  
Leaf Blast ◽  
Variable Resistance ◽  
Blast Fungus

Eight rice lines viz. CNA 8983, IAC-1732, IAC-1733, IAC-1748, IAC-1736, IAC-201, Volano and Arborea were evaluated in greenhouse for resistance against the leaf blast disease caused by Magnoparthe gracea. Lines CNA 8983, IAC 1732, IAC 1733 and IAC 1748 showed satisfactory resistance against the blast fungus while IAC 1736 and IAC 201 were intermediate and Volano and Arborea susceptible. All lines did not have lipoxygenase activity increased by methyljasmonic acid, however enzyme activity showed a positive relationship with resistance.

Sign in / Sign up

Export Citation Format

Share Document