Transgenic potatoes expressing anErwinia pectate lyase gene — results of a 4-year field experiment

Wegener, Christina

doi:10.1007/bf02358599

Cited by 11 publications

(4 citation statements)

References 13 publications

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“…Moreover, Allefs et al (1995) found that the cultivars display a great variability in secondary metabolites, particularly phenolic compounds. Consequently, their susceptibility and responses of treatments are modulated by their faculty to produce phytoalexins, and to induce key enzymes like polyphenol oxidase (PPO) and phenylalanine ammonialyase (PAL) (Weber et al 1996;Wegener 2001). In conclusion, Streptomyces isolates OE7, OE11, OE12 and OE 53 showed a potential for controlling soft rot on potato and could be useful in integrated control against Pectobacterium ssp.…”

Section: Discussionmentioning

confidence: 97%

Control of potato soft rot caused by Pectobacterium carotovorum and Pectobacterium atrosepticum by Moroccan actinobacteria isolates

Baz

Lahbabi

Samri

et al. 2011

World J Microbiol Biotechnol

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Pectobacterium carotovorum and Pectobacterium atrosepticum are dreadful causal agents of potato soft rot. Actually, there are no efficient bactericides used to protect potato against Pectobacterium spp. Biological control using actinobacteria could be an interesting approach to manage this disease. Thus, two hundred actinobacteria isolated from Moroccan habitats were tested for their ability to inhibit in vitro 4 environmental Pectobacterium strains and the two reference strains (P. carotovorum CFBP 5890 and P. atrosepticum CFBP 5889). Eight percent of these isolates were active against at least one of the tested pathogens and only 2% exhibited an antimicrobial activity against all tested Pectobacterium strains. Four bioactive isolates having the greatest pathogen inhibitory capabilities and classified as belonging to the genus Streptomyces species through 16S rDNA analysis were subsequently tested for their ability to reduce in vivo soft rot symptoms on potato slices of Bintje, Yukon Gold, Russet and Norland cultivars caused by the two pathogens P. carotovorum and P. atrosepticum. This test was carried out by using biomass inoculums and culture filtrate of the isolates as treatment. Among these, strain Streptomyces sp. OE7, reduced by 65-94% symptom severity caused by the two pathogens on potato slices. Streptomyces OE7 showed a potential for controlling soft rot on potato slices and could be useful in an integrated control program against potato soft rot pathogens in the objective to reduce treatments with chemical compounds.

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Section: Discussionmentioning

confidence: 97%

Control of potato soft rot caused by Pectobacterium carotovorum and Pectobacterium atrosepticum by Moroccan actinobacteria isolates

Baz

Lahbabi

Samri

et al. 2011

World J Microbiol Biotechnol

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“…Environmental conditions, e.g. weather (Wegener 2001) and fertilisation (Kumar et al 1991) can affect soft-rot resistance of potato tuber tissue. How far environmental conditions influence the ranking of cultivars remains to be established, but the use of coloured cultivars in potato breeding should not be a risk for increasing the susceptibility to soft rot in new cultivars.…”

Section: Discussionmentioning

confidence: 99%

Soft-rot Resistance of Coloured Potato Cultivars (Solanum tuberosum L.): The Role of Anthocyanins

Wegener

Jansen

2007

Potato Res.

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Coloured potatoes (Solanum tuberosum L.) rich in anthocyanins are gaining increasing interest on the markets, mainly due to beneficial health effects. Potato varieties containing colour pigments are therefore utilized more and more in actual breeding programmes. In this study, 10 purple-fleshed potato cultivars were compared in their resistance to soft rot caused by Pectobacterium carotovorum (Pc) with 10 white/yellow-fleshed potato cultivars. The results revealed that coloured potato cultivars exhibited on average better resistance to soft rot than white/yellowfleshed potato cultivars. On tuber halves of purple-fleshed cultivars, the extent of rotting caused by Pc was on average 28.6% lower than on white/yellow-fleshed cultivars. The greater resistance of coloured potatoes coincided with the presence of anthocyanins, higher concentrations of soluble phenols and elevated polyphenol oxidase activity in tuber tissue. These three components were significantly correlated with the extent of rotting caused by Pc. However, coloured and white/yellow-fleshed cultivars were not very different in phenylalanine ammonia-lyase and peroxidase activity. There were also no significant differences in concentrations of dry matter, starch, crude protein and glycoalkaloids. Key findings reveal that total soluble phenols and anthocyanins contributed crucially to resistance expression in tuber tissue of coloured potato cultivars.

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“…GM potato plants able to interfere with bacterial quorum sensing via expression of a lactonase gene, showed a higher level of resistance to the bacterial plant pathogen P. carotovorum (Dong et al ., ). Transgenic potato plants with increased production of 5‐O‐glucosyltransferase (Lorenc‐Kukula et al ., ) and pectate lyase (Wegener, ) also showed increased resistance to P. carotovorum . To date, however, our knowledge of root exudation in situ is limited, and the composition of root exudates is mostly determined in hydroponic culture conditions.…”

Section: Shaping the Rhizosphere Microbiomementioning

confidence: 99%

The rhizosphere microbiome: significance of plant beneficial, plant pathogenic, and human pathogenic microorganisms

2013

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Microbial communities play a pivotal role in the functioning of plants by influencing their physiology and development. While many members of the rhizosphere microbiome are beneficial to plant growth, also plant pathogenic microorganisms colonize the rhizosphere striving to break through the protective microbial shield and to overcome the innate plant defense mechanisms in order to cause disease. A third group of microorganisms that can be found in the rhizosphere are the true and opportunistic human pathogenic bacteria, which can be carried on or in plant tissue and may cause disease when introduced into debilitated humans. Although the importance of the rhizosphere microbiome for plant growth has been widely recognized, for the vast majority of rhizosphere microorganisms no knowledge exists. To enhance plant growth and health, it is essential to know which microorganism is present in the rhizosphere microbiome and what they are doing. Here, we review the main functions of rhizosphere microorganisms and how they impact on health and disease. We discuss the mechanisms involved in the multitrophic interactions and chemical dialogues that occur in the rhizosphere. Finally, we highlight several strategies to redirect or reshape the rhizosphere microbiome in favor of microorganisms that are beneficial to plant growth and health.

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Transgenic potatoes expressing anErwinia pectate lyase gene — results of a 4-year field experiment

Cited by 11 publications

References 13 publications

Control of potato soft rot caused by Pectobacterium carotovorum and Pectobacterium atrosepticum by Moroccan actinobacteria isolates

Control of potato soft rot caused by Pectobacterium carotovorum and Pectobacterium atrosepticum by Moroccan actinobacteria isolates

Soft-rot Resistance of Coloured Potato Cultivars (Solanum tuberosum L.): The Role of Anthocyanins

The rhizosphere microbiome: significance of plant beneficial, plant pathogenic, and human pathogenic microorganisms

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