Studies on chemically induced resistance of plants to diseases. I. The effect of a soaking of rice seed in dodecyl dl-alaninate hydrochloride on seedling infection by Pyricularia oryzae.

Avirulent isolates of Pyricularia oryzae and isolates of Bipolaris sorokiniana, a nonrice pathogen, were used to suppress rice blast caused by P. oryzae. In greenhouse experiments, both fungi substantially reduced leaf blast when applied 24 h or more before the pathogen. B. sorokiniana, but not avirulent isolates of P. oryzae, systemically reduced disease in leaf 5 when applied to whole plants at the four-leaf stage. In field experiments, both fungi were able to reduce neck blast significantly. No increase in grain yield was obtained by using avirulent isolates of P. oryzae, whereas five sprays with B. sorokiniana from seedling to heading stages increased the grain yield in two of three experiments conducted at two locations in Nepal. The significant increase in yield was observed under high inoculum pressure of P. oryzae. Induced resistance is suggested to be involved in the suppression of disease.

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Chemically Induced Resistance in the Cotton Plant to Attack by the Boll Weevil

Journal of Economic Entomology ◽

10.1093/jee/56.2.189 ◽

1963 ◽

Vol 56 (2) ◽

pp. 189-192 ◽

Cited By ~ 3

Author(s):

J. W. Matteson ◽

H. M. Taft ◽

C. F. Rainwater

Keyword(s):

Induced Resistance ◽

Cotton Plant ◽

Boll Weevil ◽

Chemically Induced

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Chemically Induced Virus Resistance in Arabidopsis thaliana Is Independent of Pathogenesis-Related Protein Expression and the NPR1 Gene

Molecular Plant-Microbe Interactions ◽

10.1094/mpmi.2002.15.1.75 ◽

2002 ◽

Vol 15 (1) ◽

pp. 75-81 ◽

Cited By ~ 65

Author(s):

Chui Eng Wong ◽

Rachael A. J. Carson ◽

John P. Carr

Keyword(s):

Arabidopsis Thaliana ◽

Induced Resistance ◽

Alternative Oxidase ◽

Signal Transduction Pathway ◽

Plant Viruses ◽

Chemically Induced ◽

Pathogenesis Related Protein ◽

Pathogenesis Related ◽

Distinct Branch ◽

Resistance To Viruses

Salicylic acid (SA) treatment triggers inhibition of replication or movement of several positive-sense RNA plant viruses in tobacco. This resistance can also be stimulated by nonlethal concentrations of cyanide and antimycin A (AA) without triggering induction of pathogenesis-related PR-1 protein genes. In two ecotypes of Arabidopsis thaliana (Columbia and Nössen), SA-induced resistance to a tobamovirus, Turnip vein clearing virus (TVCV), was also induced by nonlethal concentrations of cyanide and AA without concomitant induction of PR-1 gene expression. Furthermore, chemically induced resistance to TVCV, as well as the induction of the plant mitochondrial alternative oxidase (a potential target for the chemicals), was independent of NPR1, a gene that plays a key role downstream of SA in the induction of PR proteins. The chemically induced resistance to TVCV appeared to be due to inhibition of replication at the site of inoculation. Taken together, these results show that in Arabidopsis, as in tobacco, resistance to viruses can be induced via a distinct branch of the defensive signal transduction pathway. This suggests that the existence of this virus-specific branch may be widespread among plants.

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Chemically-induced resistance on soybean inhibits nodulation and mycorrhization

Plant and Soil ◽

10.1007/s11104-009-0150-7 ◽

2009 ◽

Vol 329 (1-2) ◽

pp. 259-268 ◽

Cited By ~ 17

Author(s):

Ludovic Faessel ◽

Najat Nassr ◽

Thierry Lebeau ◽

Bernard Walter

Keyword(s):

Induced Resistance ◽

Chemically Induced

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Infection of Rice Seed Grown in Arkansas by Pyricularia grisea and Transmission to Seedlings in the Field

Plant Disease ◽

10.1094/pd-90-0170 ◽

2006 ◽

Vol 90 (2) ◽

pp. 170-176 ◽

Cited By ~ 7

Author(s):

C. Guerber ◽

D. O. TeBeest

Keyword(s):

Rice Blast ◽

Subsequent Development ◽

Soil Surface ◽

Pyricularia Grisea ◽

Rice Seed ◽

Seedling Disease ◽

Infected Seed ◽

Serious Disease ◽

The Relationship ◽

Seedling Infection

Rice blast, caused by Pyricularia grisea, is an important and serious disease of rice (Oryza sativa) in the southeastern United States. The disease sporadically reaches epidemic proportions on susceptible cultivars within fields and over large areas within Arkansas. The main overwintering sources of inoculum reportedly include infected rice stubble, related host species, and infected seed. The objectives of the research were to (i) determine whether rice seed grown in Arkansas were infected with P. grisea, (ii) investigate the relationship between seed infection and seedling disease, and (iii) determine if planting naturally infected seed could lead to the subsequent development of rice blast on seedlings in the field. The results of seed assays showed that P. grisea was detected in samples of foundation, certified, and production seed. Estimated levels of infection by P. grisea of rice seed from 66 samples of rice seed grown in Arkansas ranged from 0 to 10.5%. Planting infected seed in the greenhouse and the field resulted in seedling infection. Planting naturally infected seed may result in disease development (i) from seedlings grown from infected seed planted beneath the soil surface, (ii) from seedlings grown from germinating seed left on the soil surface, (iii) from seed coats, or (iv) from nongerminated seed left on the soil surface after planting. Additional research is necessary to establish the mechanisms of infection of seedlings and to establish disease thresholds for this important fungal pathogen of rice.

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