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ABSTRACT: Transcriptomes of Monilinia fructicola, Monilinia laxa and Monilinia fructigena, the causal agents of brown rot of stone and pome fruits

PROVIDER: PRJNA419302 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR6312180_1.fastq.gz	Fastqsanger.gz
	SRR6312180_2.fastq.gz	Fastqsanger.gz
	SRR6312190_1.fastq.gz	Fastqsanger.gz
	SRR6312190_2.fastq.gz	Fastqsanger.gz
	SRR6312181_1.fastq.gz	Fastqsanger.gz

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Depicting the battle between nectarine and Monilinia laxa: the fruit developmental stage dictates the effectiveness of the host defenses and the pathogen’s infection strategies

Project description:Infections by the fungus Monilinia laxa, the main cause of brown rot in Europe, result in considerable losses of stone fruit. Herein, we present a comprehensive transcriptomic approach to unravel strategies deployed by nectarine fruit and M. laxa during their interaction. We used M. laxa-inoculated immature and mature fruit, which were resistant and susceptible to brown rot, respectively, to perform a dual RNA-seq analysis. In immature fruit, host responses, pathogen biomass, and pathogen transcriptional activity peaked at 14 – 24 hours post inoculation (hpi), at which point M. laxa appeared to switch its transcriptional response to either quiescence or death. Mature fruit experienced an exponential increase in host and pathogen activity beginning at 6 hpi. Functional analyses in both host and pathogen highlighted differences in stage-dependent strategies. For example, in immature fruit, M. laxa unsuccessfully employed carbohydrate-active enzymes (CAZymes) for penetration, which the fruit was able to combat with tightly regulated hormone responses and an oxidative burst that challenged the pathogen’s survival at later time points. In contrast, in mature fruit, M. laxa was more dependent on proteolytic effectors than CAZymes and was able to invest in filamentous growth early during the interaction. Hormone analyses of mature fruit infected with M. laxa indicated that, while jasmonic acid activity was likely useful for defense, high ethylene activity may have promoted susceptibility through induction of ripening processes. Lastly, we identified M. laxa genes that were highly induced in both quiescent and active infections and may serve as targets for control of brown rot.

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The search of genetic resources for parthenocarpic pears and comparison of gene expression between high and low parthenocarpy cultivars

Project description:Parthenocarpy—the production of seedless fruits without fertilization—is very useful for fruit cultivation. Among pear cultivars (Japanese, Chinese, and European pears and their interspecific hybrids) subjected to flower emasculation and left unpollinated, only some of the European pears had a stable and high degree of fruit set and fruit enlargement. Almost all the enlarged fruits formed no seeds. Comparison of fruits produced by using emasculation without pollination or with self-pollination ruled out the possibility of stenospermocarpy in these parthenocarpic pears. The results suggested that the abovementioned characteristics were inherited maternally by the next generation and that it should be possible to introduce parthenocarpy into Japanese pears. Neither Chinese nor Japanese pears treated with emasculation and no pollination showed consistently stable fruit set or fruit enlargement. In Chinese pears, these characteristics varied greatly from year to year, and in Japanese pears they were stable but weak. Although in each cultivar highly parthenocarpic fruits weighed slightly less than cross-pollinated ones, the cortexes of the emasculated fruits were enlarged and the fruits were not greatly inferior to those of cross-pollinated ones. By using a customized pear cDNA microarray, we compared the gene expression profiles of highly and weakly parthenocarpic cultivars before flowering. Expression of several phenylpropanoid-related genes and photosystem-related genes differed significantly between the two groups. Some of these genes were contained in the chloroplast genome. These results showed the unique mechanism of genetic parthenocarpy in pome fruits as opposed to non-pome fruits.

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The search of genetic resources for parthenocarpic pears and comparison of gene expression between high and low parthenocarpy cultivars

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