Effect of light duration on severity of black dot caused by <i>Colletotrichum coccodes</i> on potato

Tsror, Leah

doi:10.1111/j.0032-0862.2004.01011.x

Cited by 17 publications

(4 citation statements)

References 19 publications

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“…Soil infestation levels at the central Minnesota trial site in the present study fall within the range documented above. Inconsistencies in the ability of C. coccodes to affect yield or cause disease are not unexpected and have been reported on numerous occasions with black dot greenhouse and field research (3,7,21,22,27,28,39,43,46,(49)(50)(51)(52). Variable results in yield reduction were reported between field experiments performed over 2 years in Idaho when comparing cultivar reaction to foliar inoculations (27).…”

Section: Discussionmentioning

confidence: 99%

Colonization of Potato by Colletotrichum coccodes: Effect of Soil Infestation and Seed Tuber and Foliar Inoculation

2010

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Colonization of potato (Solanum tuberosum) tissue, including roots, stolons, and above and below ground stems, by Colletotrichum coccodes, the causal agent of black dot, was evaluated following soil infestation, inoculation of seed tubers and foliage, and every combination thereof, in field trials over two growing seasons in North Dakota and Minnesota. A total of 107,520 isolations for C. coccodes performed across four site-years allowed for an extensive comparison of fungal colonization of the host plant and disease severity. The black dot pathogen was detected in potato stems at the first sampling date in all four site-years, as early as 14 days prior to emergence. Colonization of above and below ground stems occurred at a higher frequency than in roots and stolons in all four site-years, resulting in significantly higher relative area under the colonization progress curves (RAUCPCs) (α = 0.05). Although fungal colonization and disease incidence were higher in inoculated and/or infested treatments, sufficient natural inoculum was present to result in substantial levels of disease in noninoculated and noninfested plots. However, noninoculated and noninfested plots displayed the lowest RAUCPC values across three of four site-years and those treatments with multiple inoculation events tended to have higher RAUCPC values. Isolates belonging to vegetative compatibility group (VCG)2 and -5 were recovered from plants sampled in 2004 more frequently than isolates belonging to VCG1 and -3. A significant difference in disease incidence on stems was observed only in North Dakota in 2004 and Minnesota in 2003 (α = 0.05). Noninoculated and noninfested plots displayed the lowest disease incidence, whereas those treatments with more than one inoculation and/or infestation event tended to have higher disease incidence. Results of this study, including the disease severity and yield data, provide a better understanding of colonization of potato plants by C. coccodes and its impact.

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Section: Discussionmentioning

confidence: 99%

Colonization of Potato by Colletotrichum coccodes: Effect of Soil Infestation and Seed Tuber and Foliar Inoculation

2010

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“…While much work has been done to characterize plant metabolic responses to photoperiod, there are few reports describing how plant colonization by microorganisms is affected by photoperiod. Tsror (2004) studied the effect of photoperiod on the severity of potato black dot caused by Colletotrichum coccodes. Fungal colonization of stem segments was significantly greater on four potato cultivars under SD (8 h of light) than under LD (16 h of light) conditions.…”

Section: Introductionmentioning

confidence: 99%

Photoperiod regulates elicitation of growth promotion but not induced resistance by plant growth-promoting rhizobacteria

2007

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For several years, we have noticed that plant growth-promoting rhizobacteria (PGPR), which consistently promote plant growth in greenhouse tests during spring, summer, and fall, fail to elicit plant growth promotion during the midwinter under ambient light conditions. This report tests the hypothesis that photoperiod regulates elicitation of growth promotion and induced systemic resistance (ISR) by PGPR. A commercially available formulation of PGPR strains Bacillus subtilis GB03 and Bacillus amyloliquefaciens IN937a (BioYield) was used to grow tomato and pepper transplants under short-day (8 h of light) (SD) and long-day (12 h of light) (LD) conditions. Results of many experiments indicated that under LD conditions, BioYield consistently elicited significant increases in root and shoot mass as well as in several parameters of root architecture. However, under SD conditions, such increases were not elicited. Differential root colonization of plants grown under LD and SD conditions and changes in leachate quality partially account for these results. BioYield elicited ISR in tomato and pepper under both LD and SD conditions, indicating that although growth promotion was not elicited under SD conditions, induced resistance was. Overall, the results indicate that PGPR-mediated growth promotion is regulated by photoperiod, while ISR is not.

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“…As no necrosis development was observed in winter, even in controlled conditions (20–22°C), temperature alone cannot account for the seasonal changes observed in alder susceptibility to P. × alni . Other climatic parameters such as day length (Tsror (Lahkim), ); physiological changes in the host plant (Browne & Mircetich, ) or abiotic stress (Bostock et al ., ) might modify disease susceptibility.…”

Section: Discussionmentioning

confidence: 99%

Assessment of inoculation methods for screening black alder resistance to Phytophthora ×alni

et al. 2015

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Identification of resistance to Phytophthora 9alni could provide the basis for a management strategy against alder decline in riparian ecosystems in Europe. This study aimed to test methods to evaluate the resistance of riparian alders to the disease, and to screen alder genotypes for resistance. Phytophthora 9alni isolates were compared for their aggressiveness (lesion length on stem) and sporulation capacity (sporangia). While no difference in lesion lengths was found between isolates, sporangia production was dependent on isolate, highlighting the need for careful selection of isolates used for zoospore inoculation methods. Inoculation tests carried out at different periods of the year revealed a seasonal change in susceptibility to the disease, with the period from June to September being the most efficient for inoculation tests. Stem-wounded inoculations, carried out on excised shoots, were unreliable for evaluating the level of resistance of alder genotypes to P. 9alni infection, with divergent results between two successive years or between two inoculation periods during the same year. In contrast, a method that mimics the natural conditions of infection, based on flooding of rooted cuttings in artificially infected river water, was found promising. Another method, based on the inoculation of foliated terminal shoots with zoospore suspensions, was found to be repeatable and could be used for high-throughput analyses. Altogether, the results show a continuous resistance response from highly susceptible to moderately resistant genotypes. This suggests that breeding might be a useful strategy to manage alder decline caused by P. 9alni.

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Effect of light duration on severity of black dot caused by Colletotrichum coccodes on potato

Cited by 17 publications

References 19 publications

Colonization of Potato by Colletotrichum coccodes: Effect of Soil Infestation and Seed Tuber and Foliar Inoculation

Colonization of Potato by Colletotrichum coccodes: Effect of Soil Infestation and Seed Tuber and Foliar Inoculation

Photoperiod regulates elicitation of growth promotion but not induced resistance by plant growth-promoting rhizobacteria

Assessment of inoculation methods for screening black alder resistance to Phytophthora ×alni

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