Exploration of resistance toPhelipanche aegyptiacain tomato
PEST MANAGEMENT SCIENCE
Authors: Bai, Jinrui; Wei, Qiang; Shu, Jinshuai; Gan, Zhongxiang; Li, Beijin; Yan, Delin; Huang, Zejun; Guo, Yanmei; Wang, Xiaoxuan; Zhang, Luxia; Cui, Yanan; Lu, Xiaoxiao; Lu, Jinghua; Pan, Chunyang; Hu, Junling; Du, Yongchen; Liu, Lei; Li, Junming
Abstract
BACKGROUND Cultivated tomatoes are highly susceptible to the destructive parasitePhelipanche aegyptiaca. Wild relatives show the potential resistance for genetic improvement. However, their genetic and molecular mechanisms are still unknown. RESULTS Among 50 wild tomato accessions were evaluated for resistance toP. aegyptiaca, most of the wild relatives exhibited varying degrees of resistance compared to the cultivars.Solanum pennelliiLA0716 performed the most promising and solid resistance with very low infection by the broomrape. The resistance involved in LA0716 was further confirmed by cytological analysis, and explored by employing a permanent introgression line (IL) population. Thirteen putative quantitative trait loci (QTLs) conferring the different resistance traits were identified. They are located on chromosomes 1, 2, 3, 4, 6, 8 and 9. The most attractive QTLs are positioned in IL6-2 and overlap with IL6-3. Specially, IL6-2 showed the highest and most consistent resistance for multiple traits and explained the major phenotypic variation of LA0716. Analysis of candidate genes involved in these regions showed thatBeta(Solyc06g074240) and P450 (Solyc06g073570,Solyc06g074180andSolyc06g074420) genes are substantially related to the strigolactone (SL) pathway. Transcript analysis further demonstrated that bothSolyc06g073570andSolyc06g074180might play an important role in the reduction ofP. aegyptiacainfection. CONCLUSION Germplasms resistant toP. aegyptiacawere found in wild tomato species. QTLs conferringP. aegyptiacatolerance in LA0716 were identified. IL6-2 is identified as a prospective line possessing the major QTLs. The candidate genes would provide the availability to assist the introgression of the resistance in future breeding programmes.
Dietary supplementation with a microencapsulated blend of organic acids and botanicals alters the kinome in the ileum and jejunum ofGallus gallus
PLOS ONE
Authors: Swaggerty, Christina L.; Arsenault, Ryan J.; Johnson, Casey; Piva, Andrea; Grilli, Ester
Abstract
The use of natural products as feed additives in the poultry industry is increasing; however, most studies focus on performance and growth with little regard for determining mechanism. Our laboratory designed a chicken (Gallus gallus)-specific immunometabolic kinome peptide array. Using this tool to examine the active enzymes responsible for phosphorylation events (kinases) provides important information on host and cellular functions. The objective of this project was to determine if feeding a microencapsulated product comprised of a blend of organic acids and botanicals (AviPlus(R)P) impacts the intestinal kinome of broiler chickens (Gallus gallus). Day-of-hatch chicks were provided 0 or 500g/MT of the additive and jejunal and ileal segments collected for kinome analysis to determine the mode-of-action of the additive. Gene ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis was performed by uploading the statistically significant peptides to the Search Tool for the Retrieval of Interacting Genes database. As a whole, GO and KEGG analysis showed similar activities in the ileum and jejunum. However, there were a small number of KEGG pathways that were only activated in either the ileum or jejunum, but not both. Analysis of the adipocytokine and PI3K-AKT signaling pathways showed differences between ileal and jejunal activity that were controlled, in part, by AKT3. Additionally, cytokine/chemokine evaluation showed the ileum had higher IL1 beta, IL6, IL10, TNF alpha, IFN gamma, CXCL8, and CCL4 mRNA expression levels (P<0.05). As a whole, the data showed the addition of microencapsulated organic acids and botanicals to a broiler diet activated many of the same signaling pathways in the ileum and jejunum; however, distinctions were observed. Taken together, the findings of this study begin to define the mode-of-action that microencapsulated organic acids and botanicals have on two important intestinal segments responsible for nutrient digestion and absorption in chickens.