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. , E. Fuchs, M. Gruntzig, B. Schulz, D. Klein, A.E. Melchinger (1997): Resistance of early-maturing European maize germplasm to sugarcane mosaic virus (SCMV) and maize dwarf mosaic virus (MDMV). — Plant Breeding 116, 499

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Maize seeds from inbred line Mo17, susceptible to Sugarcane mosaic virus (SCMV), were investigated for SCMV seed transmission. The seed quality significantly influenced the seed transmission rate. There were more infected seedlings derived from larger seeds than smaller seeds in both golden (G) and buff (B) seed groups, the proportion of infected seedlings in G1 was similar to G2 and B1, and significantly higher than the others (P < 0.05 or P < 0.01). While the proportion of SCMV seed transmission was higher in golden (3.9%) than buff seeds groups (2.3%), and there were significantly difference (P < 0.05) between the both colors seeds. However the percentage of infected seedlings was closely related to the location of seeds on ears, most infected seedlings were derived from seeds of the middle (Part III) and mid-base regions (Part IV), and the both parts (Parts III and IV) were significantly higher than that of Part I (P < 0.05). Fisher’s exact test indicated that the seed quality was associated significantly with the efficiency of SCMV seed transmission.

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Treatment of acibenzolar-S-methyl (bionTM), salicylic acid and the saprophytic bacterium Pseudomonas fluorescens exhibited induced systemic resistance in Sorghum bicolor (cv. Rio) to Sugarcane mosaic virus (SCMV) isolates from sugarcane. The treatments significantly slowed down the SCMV titre in plants during the initial growth phase. The enhanced induction of total phenols, phenylalanine ammonia lyase (PAL), peroxidase (PO) and polyphenol oxidase (PPO) might have contributed for the induced systemic resistance triggered by various biotic and abiotic inducers. More induction of PO and PPO isozymes were noticed upon application of these inducers. In the present studies, there was a significant decrease of SCMV titre as evidenced by ELISA in these treatments. Among the treatment methods, foliar application was highly effective in case of the abiotic elicitors bion and salicylic acid whereas with P. fluorescens seed treatment was effective.

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The heritability of maize resistance to one Czech isolate of Sugarcane mosaic virus (SCMV) was determined. Parental maize lines with different degree of resistance or susceptibility, their F 1 and F 2 progeny were mechanically inoculated by this virus and symptom development were observed during 63 days. The analysis of resistance of F 1 hybrids, derived from resistant lines and lines with a different degree of susceptibility, suggests that there was no hybrid found which would not exhibit any symptom of infection induced by SCMV, but the symptoms appeared one or two weeks later, compared with the susceptible line, the onset of infection was very gradual and the percentage of infection never reached 100 percent. Heritability of this trait, determined on the basis of the variances of parents, F 1 hybrids, and the development of infection in F 2 populations was relatively high and ranged from 0,70 to 0,91. From these results we can assume that the resistance of tested lines to SCMV detected in the greenhouse is not inherited completely dominantly but it may be controlled partially dominantly or polygenically.

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