ABSTRACT
A serious leaf disease caused by Colletotrichum dematium was found during the cultivationof Sarcandra glabra in Jingxi, Rong’an, and Donglan Counties in Guangxi Province, whichinflicted huge losses to plant productivity. Biological control gradually became an effectivecontrol method for plant pathogens. Many studies showed that the application of actinomycetesin biological control has been effective. Therefore, it may be of great significance tostudy the application of actinomycetes on controlling the diseases caused by S. glabra.Strains of antifungal actinomycetes capable of inhibiting C. dematium were identified, isolatedand screened from healthy plants tissues and the rhizospheres in soils containing S.glabra. In this study, 15 actinomycetes strains were isolated and among these, strains JT-2F,DT-3F, and JJ-3F, appeared to show antagonistic effects against anthracnose of S. glabra.The strains JT-2F and DT-3F were isolated from soil, while JJ-3F was isolated from plantstems. The antagonism rate of strain JT-2F was 86.75%, which was the highest value amongthe three strains. Additionally, the JT-2F strain also had the strongest antagonistic activitywhen the antagonistic activities were tested against seven plant pathogens. Strain JT-2F isable to produce proteases and cellulase to degrade the protein and cellulose componentsof cell walls of C. dematium, respectively. This results in mycelia damage which leads toinhibition of the growth of C. dematium. Strain JT-2F was identified as Streptomyces tsukiyonensisbased on morphological traits and 16S rDNA sequence analysis.
ABSTRACT
A serious leaf disease caused by Colletotrichum dematium was found during the cultivationof Sarcandra glabra in Jingxi, Rong’an, and Donglan Counties in Guangxi Province, whichinflicted huge losses to plant productivity. Biological control gradually became an effectivecontrol method for plant pathogens. Many studies showed that the application of actinomycetesin biological control has been effective. Therefore, it may be of great significance tostudy the application of actinomycetes on controlling the diseases caused by S. glabra.Strains of antifungal actinomycetes capable of inhibiting C. dematium were identified, isolatedand screened from healthy plants tissues and the rhizospheres in soils containing S.glabra. In this study, 15 actinomycetes strains were isolated and among these, strains JT-2F,DT-3F, and JJ-3F, appeared to show antagonistic effects against anthracnose of S. glabra.The strains JT-2F and DT-3F were isolated from soil, while JJ-3F was isolated from plantstems. The antagonism rate of strain JT-2F was 86.75%, which was the highest value amongthe three strains. Additionally, the JT-2F strain also had the strongest antagonistic activitywhen the antagonistic activities were tested against seven plant pathogens. Strain JT-2F isable to produce proteases and cellulase to degrade the protein and cellulose componentsof cell walls of C. dematium, respectively. This results in mycelia damage which leads toinhibition of the growth of C. dematium. Strain JT-2F was identified as Streptomyces tsukiyonensisbased on morphological traits and 16S rDNA sequence analysis.
ABSTRACT
CYP450 plays an essential role in the development and growth of the fruits of. However, little is known about thegene in. Here, based on transcriptome data, a full-length cDNA sequence ofwas cloned by reverse transcriptase-polymerase chain reaction (RT-PCR) and rapid-amplification of cDNA ends (RACE) strategies.is 1677 bp in length (GenBank accession No. AEM42985.1) and contains a complete open reading frame (ORF) of 1422 bp. The deduced protein was composed of 473 amino acids, the molecular weight is 54.01 kDa, the theoretical isoelectric point (PI) is 8.8, and the protein was predicted to possess cytochrome P450 domains.gene was highly expressed in root, diploid fruit and fruit treated with hormone and pollination. At 10 days after treatment with pollination and hormones, the expression of Sghad the highest level and then decreased over time, which was consistent with the development of fruits of. Hormonal treatment could significantly induce the expression of. These results provide a reference for regulation of fruit development and the use of parthenocarpy to generate seedless fruit, and provide a scientific basis for the production of growth regulator application agents.
ABSTRACT
Abstract: Total RNA was isolated from Siraitia grosvenorii fruit by the method of modified Trizol, according to S. grosvenorii fruit characteristics of rich phenols, polysaccharide, oil and proteins. The OD260/280, OD260/230, RNA integrity (RIN) and yield of the total RNA with this method were 2.01, 2.02, 9.50 and 260 mirog.g-1, respectively. The open reading frame (ORF) of dehydroascorbate reductase (DHAR), named as SgDHAR, was cloned by rapid amplification of cDNA ends (RACE) and RT-PCR method from S. grosvenorii. The GenBank accession number for this gene is KC907731. The SgDHAR gene contains a full-length cDNA of 1,252 bp including ORF of 819 bp and encodes a predicted protein of 272 amino acids. The molecular mass is 30.217 7 kD and the isoelectric point is 8.76. Homology comparison showed that it shared 87% nucleotide sequence homology with Cucumis sativus. Expression patterns using qRT-PCR analysis showed that SgDHAR was mainly expressed in fruit and stem, followed by flower, and was lowest in root, while the expression level was 6.83 times in triploid. T than that in diploid. Therefore, SgDHAR gene may be involved in abortion of triploid seedless S. grosvenorii.