Summary Orobanche crenata (broomrape) is a root parasite thatrepresents the major constraint for pea (Pisum sativum)cultivation in the Mediterranean area and the MiddleEast The eﬃcacy of available control methods isminimal and breeding for O crenata resistance isconsidered the most promising strategy of control Onlymoderate levels of incomplete resistance are available inpea germplasm In order to identify and map thequantitative trait loci (QTL) controlling the trait, 115F 2 plants derived from the cross between a susceptibleand a resistant parent were analysed using isozymes,random ampliﬁed polymorphic DNA and sequencetagged site markers F 2 -derived F 3 lines were studiedfor O crenata resistance under ﬁeld conditions Thelinkage map was constructed with MAPMAKER V20Of 217 markers, 120 could be mapped into 21 linkagegroups Linkage groups consisted of 13 to two markerloci covering 1770 cM The mean inter-marker distancewas 1764 cM Simple interval mapping (SIM) andcomposite interval mapping (CIM) were performedusing QTL Cartographer The CIM approach using ﬁvecofactors was clearly the most eﬃcient way to locateputative QTL Two QTL for O crenata resistance (Ocp1and Ocp2), explaining only a moderate portion of theobserved variation (96% and 114% respectively), weredetectedKeywords: Pisum spp, Orobanche crenata, QTL analy-sis, resistance genes

Broomrape (Orobanche crenata Forsk.) resistance in peas (Pisum sativum L.).

Locating quantitative trait loci associated with Orobanche crenata resistance in pea

Parasitic weeds represent a main component of weed problems facing agriculture and negatively impact agroecosystem and environment. They belong to different plant families and are either hemi- or holo- root or shoot parasites. They attack plant species of different botanical families and growth forms and distributed in different geographical regions in the world, cause great yield losses and under sever infestation they lead to complete crop loss. Parasitic weeds represent a highly ecological, biological and physiological tolerant species to both internal and external environmental changes. They adapt themselves to disperse by different common agents and to survive and tolerate severe environmental condition under which long-term ecophysiological dormancy has been very well demonstrated and developed in many of the parasitic species in absence of suitable conditions for germination mainly the availability of host plants. The relationship between these parasites and their hosts is highly complicated, both sometimes work jointly for successful attachment and complete parasitism, while in contrast, antagonistic interactions are most common between both at which different mechanisms may be involved in the resistance of host to parasite attachment, germination, penetration and development which is termed as tolerant/resistance mechanism or sometimes described as a defense mechanism. The parasite may be also very well prepared for positive response to host signals and showed ability to attach itself to the host cell surface and to penetrate with aid of enzymes or other chemical secretions that allow dissolvent and separation of host cells. In the central of these complicated chemical reactions between parasite and host plants

Broomrape (Orobanche crenata Forsk.) resistance in peas (Pisum sativum L.).

Citations

Locating quantitative trait loci associated with Orobanche crenata resistance in pea

Parasitic weeds and allelopathy:from the hypothesis to the proofs

Evaluation of bioactivity of phytotoxins from pathogenic fungi of Orobanche sp.

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