![]() Endophytic fungi were isolated from surface-sterilized plant tissues and anti-oomycete activity was measured by in vivo assay using tomato seedlings. To isolate endophytic fungi from vegetable plants and examine their in vivo anti-oomycete activity against Phytophthora infestans in tomato plants. Kim, H-Y Choi, G J Lee, H B Lee, S-W Lim, H K Jang, K S Son, S W Lee, S O Cho, K Y Sung, N D Kim, J-C Some fungal endophytes from vegetable crops and their anti-oomycete activities against tomato late blight. The combination of major genes and minor QTL may provide a durable resistance to late blight in tomato. Source of resistance to Ph-2, Ph-3, and this minor QTL traces back to line 元707, or Richter’s Wild Tomato. This minor QTL may be novel and may be worth investigating further. Furthermore, there was a minor QTL on chromosomes 12, which has not been reported before. The major QTLs are probably caused by the Ph-2 and Ph-3 genes. There were two major QTL associated with late blight resistance located on chromosomes 9 and 10 with likelihood of odd (LOD scores of more than 42 and 6, explaining 67% and 14% of the total phenotypic variation, respectively. These were conducted at Mountain Horticultural Crops Reseach & Extension Center (MHCREC at Mills River, NC, and Mountain Research Staion (MRS at Waynesville, NC in 2011, 2014, and 2015. 7775, consisting of 250 individuals at F2 and F2-derived families, were evaluated in replicated trials. To achieve this objective, a population, derived from the crossings of NC 1CELBR Ã- Fla. The objective of the present study was to map the genes and QTL associated with late blight resistance in a tomato population derived from intra-specific crosses. Precise molecular mapping of all those major genes and potential QTL is important in the development of suitable molecular markers and hence, marker-assisted selection (MAS. In addition to these three genes, it is also believed that there are additional factors or quantitative trait loci (QTL conferring resistance to late blight. There are three known major genes, Ph-1, Ph-2, and Ph-3, conferring resistance to late blight. Mapping Quantitative Trait Loci (QTL for Resistance to Late Blight in Tomatoįull Text Available Late blight caused by Phytophthora infestans (Montagne, Bary is a devastating disease of tomato worldwide. The results strongly indicate that oligochitosan can be used as an eco-friendly organic material for the control of late blight on tomato and potato plants. In field experiments, oligochitosan effectively suppressed the development of late blight on potato and tomato plants with control values of 72% and 48%, respectively. ![]() On the other hand, it showed a 16-hr curative activity against red pepper anthracnose, but not against tomato late blight and wheat leaf rust. ![]() It also displayed a moderate 1-day protective activity with control values of 67?89% at concentrations of 500 and 1,000 ?g/ml against wheat leaf rust and red pepper anthracnose. In our study, an oligochitosan sample (320?3,000 amu showed a potent 1-day protective activity with control values more than 94% at concentrations of 500 and 1,000 ?g/ml especially against tomato late blight caused by Phytophthora infestans under growth chamber conditions. There have been many reports on the induced systemic resistance and in vivo antifungal activities of higher molecular weight chitosans with molecular weights over 3,000 amu (atomatic mass unit, but there are few papers on in vivo antifungal activities of low molecular weight chitosans (oligochitosans with molecular weights less than 3,000 amu. Especially inĬontrol of Late Blight of Tomato and Potato by Oilgochitosanĭirectory of Open Access Journals (Sweden)įull Text Available Chitosan is a linear polysaccharide composed of randomly distributed β-(1-4-linked D-glucosamine and Nacetyl- D-glucosamine. infestans on tomatoes is the main source of inoculum. In regions of Europe mentioned, where tomatoes are grown in the open, P. In the Netherlands, the source of inoculum of the late blight fungus on tomatoes is the late blight fungus on potato crops. Partial resistance of tomatoes against Phytophthora infestans, the late blight fungus
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