Soft Rot Susceptibility of Potatoes with High Reducing Sugar Content

Otazú, V.

doi:10.1094/phyto-71-290

Cited by 30 publications

(11 citation statements)

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“…In those tissues which are photosynthetically inactive like roots, the situation is obviously of higher complexity. Otazu and Secor (1981) reported augmented sugar metabolism in potato tubers enhances the susceptibility to root rot inducing pathogens, which confirms our findings. Moreover, the abundance of PR-10 proteins in the susceptible variety is clearly enhanced as compared to the more resistant one.…”

Section: Discussionsupporting

confidence: 92%

Proteomic Profiling Unravels Insights into the Molecular Background Underlying Increased Aphanomyces euteiches-Tolerance of Medicago truncatula

et al. 2005

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To investigate the molecular mechanisms underlying susceptibility of legumes to the root pathogen Aphanomyces euteiches (oomycota), comparative proteomic studies have been carried out. In a first approach, we have analysed two Medicago truncatula lines of the French CORE collection (F83.005-5 (R2002) and F83.005-9 (R2002)), which showed either increased or decreased susceptibility to A. euteiches as compared to the widely adopted line A17. Several proteins were identified to be differentially induced after pathogen challenge in the two M. truncatula accessions with altered disease susceptibility, whereof proteins with increased abundances in the more resistant line F83.005-9 could be involved in mechanisms that lead to an improved disease resistance. Among these proteins, we identified two proteasome alpha subunits, which might be involved in defense response. To broaden our studies on A. euteiches-tolerance of M. truncatula, we investigated two other phenomena that lead to an either increased A. euteiches-resistance or to an enhanced susceptibility. The topic of an enhanced plant resistance to A. euteiches was studied in plants showing a bioprotective effect of a pre-established arbuscular mycorrhiza (AM) symbiosis. Evaluation of root fresh weights and pathogen spreading in the root system clearly indicate that mycorrhizal plants show increased A. euteiches-resistance as compared to non-mycorrhizal plants. Proteome analyses revealed the induction of similar protein patterns as in the M. truncatula accessions with comparatively high resistance level to A. euteiches. In a third approach, increased A. euteiches susceptibility was effected by exogenous abscisic acid (ABA) application prior to root infection. Evaluation of the abundance levels of a group of pathogenesis related class 10 (PR10)-like proteins, which were previously identified to be regulated after A. euteiches infection, revealed a correlation between the abundance levels of these proteins and the A. euteiches infection level or severity.

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Section: Discussionsupporting

confidence: 92%

Proteomic Profiling Unravels Insights into the Molecular Background Underlying Increased Aphanomyces euteiches-Tolerance of Medicago truncatula

et al. 2005

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“…During storage, tuber sweetening occurs due to starch degradation and the associated accumulation of soluble sugars (ap Rees et al, 1988). This process was reported to correlate with increased susceptibility of the stored tuber tissue to E. carotovora (Otazu and Secor, 1981). However, the data in the present study clearly demonstrate that tuber tissue with high levels of reducing sugars in fact exhibits augmented soft-rot resistance (see the four independent antisense lines in Fig.…”

Section: Aatp1(st)supporting

confidence: 47%

“…3 and 4) clearly contrasts with earlier observations made with stored potato tubers (Otazu and Secor, 1981). During storage, tuber sweetening occurs due to starch degradation and the associated accumulation of soluble sugars (ap Rees et al, 1988).…”

Section: Aatp1(st)mentioning

confidence: 59%

“…Otazu and Secor (1981) reported that an increase in the level of reducing sugars in potato tubers does not confer resistance rather than enhancing the susceptibility to pathogens. Because the latter observation contrasts with the widely observed high-sugar resistance (Horsfall and Dimond, 1957), it appeared important to study the relationship between altered carbohydrate levels and pathogen resistance also in the heterotrophic potato storage tissue.…”

mentioning

confidence: 99%

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Inhibition of the Plastidic ATP/ADP Transporter Protein Primes Potato Tubers for Augmented Elicitation of Defense Responses and Enhances Their Resistance against Erwinia carotovora

et al. 2002

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Tubers of transgenic potato (Solanum tuberosum) plants with decreased activity of the plastidic ATP/ADP transporter AATP1 display reduced levels of starch, modified tuber morphology, and altered concentrations of primary metabolites. Here, we demonstrate that the spontaneous production of hydrogen peroxide, the endogenous content of salicylic acid, and the levels of mRNAs of various defense-related genes are similar in tuber discs of wild-type and AATP1(St) antisense plants. However, upon challenging the tissue with fungal elicitors or culture supernatants of the soft rot-causing pathogen Erwinia carotovora subsp. atroseptica, the AATP1(St) antisense tubers exhibit highly potentiated activation of defense responses when compared with wild-type tissue. The augmented defense responses comprise enhanced accumulation of transcripts of five defenserelated genes (␤-1,3-GLUCANASE B2 and A1, CHITINASE B3 and A2, and Phe AMMONIA-LYASE) and enhanced elicitation (up to 21-fold) of the early hydrogen peroxide burst. The potentiated activation of cellular defense responses in AATP1(St) antisense tubers is not accompanied by a precedent increase in endogenous salicylic acid levels, but is associated with a strongly enhanced resistance of the tissue to E. carotovora. From these results, we conclude that inhibition of primary metabolic reactions induces a primed state that sensitizes the potato tubers for improved elicitation of various cellular defense responses, which likely contribute to enhanced E. carotovora resistance.

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“…The six potato cultivars tested in common at Bousalem and Essaida 1 or at Bousalem and Essaida 2 had similar susceptibility ranks as attested by high correlations (Table 3). For another storage disease, such as soft rot, however, Ibrahim et al (1979) observed an increase in susceptibility to soft rot, with an increasing age of tubers, and Otazu & Secor (1981) and Hidalgo & Echandi (1983) reported increasing susceptibility to Erwinia chrysanthemi with increasing length of storage at 4 ~ because of higher reducingsugar content. Thus, cropping season (spring or autumn) could change tuber physiology or components that lead to differences in susceptibility to leak for certain cultivars.…”

Section: Resultsmentioning

confidence: 99%

Assessing potato cultivars in Tunisia for susceptibility to leak caused byPythium aphanidermatum

Priou

Triki²,

Mahjoub³

et al. 1997

Potato Res

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Soft Rot Susceptibility of Potatoes with High Reducing Sugar Content

Cited by 30 publications

References 0 publications

Proteomic Profiling Unravels Insights into the Molecular Background Underlying Increased Aphanomyces euteiches-Tolerance of Medicago truncatula

Proteomic Profiling Unravels Insights into the Molecular Background Underlying Increased Aphanomyces euteiches-Tolerance of Medicago truncatula

Inhibition of the Plastidic ATP/ADP Transporter Protein Primes Potato Tubers for Augmented Elicitation of Defense Responses and Enhances Their Resistance against Erwinia carotovora

Assessing potato cultivars in Tunisia for susceptibility to leak caused byPythium aphanidermatum

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