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To map the QTLs of Fusarium moniliforme ear rot resistance in Zea mays L., a total of 230 F₂ individuals, derived from a single cross between inbred maize lines R15 (resistant) and Ye478 (susceptible), were genotyped for genetic map construction using simple sequence repeat (SSR) markers and amplified fragment length polymorphism (AFLP) markers. We used 778 pairs of SSR primers and 63 combinations of AFLP primers to detect the polymorphisms between parents, R15 and Ye478. From the polymorphic 30 AFLP primer combinations and 159 SSR primers, we scored 260 loci in the F₂ population, among which 8 SSR and 13 AFLP loci could not be assigned to any of the linkage groups. An integrated molecular genetic linkage map was constructed by the remaining 151 SSR and 88 AFLP markers, which distributed throughout the 10 linkage groups of maize and spanned the genome of about 3463.5 cM with an average of 14.5 cM between two markers. On 4 chromosomes, we detected 5 putative segregation distortion regions (SDRs), including 2 new ones (SDR₂ and SDR₇). The other 3 SDRs were located near the regions where gametophyte genes were mapped, indicating that segregation distortion could be partially caused by gametophytic factors.
Fusarium spp. causes yellowing, corm rot, browning of foliage and wilting in gladiolus. It reduces the quality, yield and market value of gladiolus. This disease is caused by the Fusarium species; namely Fusarium oxysporum f. sp. gladioli, F. solani, F. moniliforme and F. roseum in gladiolus. F. oxysporum f. sp. gladioli (Massay) Snyder and Hansen is the most common and worldwide in distribution. The fungus can survive in soil indefinitely as mycelium, clamydospores, microconidia and macroconidia. Infected corms show tissue discoloration. The corms become softened, wrinkled and mummified in storage. Despite many attempts to control this disease, the problem is still important worldwide. The management practices generally em­ployed for its control include resistant cultivars, chemical applications, cultural prac­tices and biotechnological approaches. However, incorporation of integrated man­agement provides a better opportunity to manage this disease. In this review, the re­ports on the major progress made in management of Fusarium yellows in gladiolus species have been discussed.
The inhibitory properties of the ethanolic and methanolic leaf extracts of Vernonia amygdalina and Cola acuminata on the fungal pathogens isolated from infected tomato fruits were investigated. The pathogens were Fusarium moniliformes and Rhizopus stolonifer. Various concentrations of the extracts ranging from 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100% were separately added to PDA media. The fungal pathogens were separately inoculated into the media and incubated for seven days. Antifungal effects of these extracts on the mycelia growth of the pathogens were significant at P<0.05 for all treatments at higher concentrations. At 10-50% concentration, ethanolic and methanolic extracts of Vernonia amygdalina and Cola acuminata had no significant effect on the mycelia growth of Fusarium moniliformes and Rhizopus stolonifer after seven days observation period. At 60-100% concentrations, the two pathogens were completely inhibited by ethanolic extracts of Vernonia amygdalina and Cola acuminata. Methanolic extracts of Vernonia amygdalina and Cola acuminata inhibited completely Fusarium moniliformes and Rhizopus stolonifer at 80-100% concentrations. The in vitro inhibitory effects of these extracts at higher concentrations indicated that they can be used for the control of tomato fruit rot. It may be necessary to use them in prolonging the shelf-life of fresh tomato fruit and some other fruits.
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