QTLs of resistance to race 1 of Xanthomonas campestris pv. campestris in Brassica oleracea
| Autor: | Iglesias Bernabé, Laura, Madloo, Pari, Cartea González, María Elena, Soengas Fernández, María del Pilar |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | 1 página.- Resumen del póster presentado en el Simposio organizado por la Misión Biológica de Galicia (MBG-CSIC) y la International Society of Horticultural Science (ISHS) en Pontevedra, entre el 22 y el 25 de mayo de 2017. Black rot caused by Xanthomonas campestris pv. campestris (Xcc) is one of the most devastating diseases in Brassica oleracea crops. Bacteria enter through hydathodes and wounds in the leaves, colonizing mesophyll and the vascular system. As a consequence plant may wilt and die. There are 9 races of the pathogen, being race 1 the most damaging in B. oleracea crops. Breeding for resistance to Xcc race 1 is complicated because there are only partial sources of resistance. A genetic dissection of the resistance and its location in a genetic map would help in obtaining linked molecular markers to do a MAS breeding program. Mapping the resistance would be also the first step in localizing genes underlying this trait. Leaves of individuals of the BolTBDH mapping population were inoculated two consecutive times in order to study constitutive and inducted resistance. This experiment was carried out under controlled conditions. Subjective score (scale from 1 to 9, where 1 is a healthy leaf), percentage of lesioned area per leaf and percentage of inoculated points with symptoms were measured. A QTL approach was chosen to analyze the data. Sixteen QTLs related to disease traits and to leaf size were found spread on six linkage groups. Resistance is related to area of the leaf, since QTLs for score and percentage of lesioned area colocated with QTLs for leaf size. Three QTLs for resistance were found during the second inoculation but no in the first one indicating that plants acquired some kind of induced resistance after being in contact with Xcc for the first time. |
| Databáze: | OpenAIRE |
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