Afinitatea şi unele particularităţi fiziologice ale diferitor rase de lupoaie (Orobanche cumana wallr.)
2016
Duca, M. (Academy of Sciences of Moldova. University of the Academy of Sciences of Moldova, Chisinau (Republic of Moldova) | Duca, A. | Cernolev, E. | Mutu, A. | Chilari, R.
The interaction between sunflower (host) and broomrape (parasite) is directly influenced by physio-logical and biochemical characteristics of the pathogen, characterized by affinity, virulence and aggressiveness.The parasitization process of broomrape begins with the germination of seeds and is induced by germinationstimulants located in the rhizosphere of sunflower plants. In this study the germination capacity of broomrapeseeds (45 populations collected from sunflower and tobacco agrocenosis) has been evaluated on exudates ob-tained from the root system of various sunflower genotypes: the sensitive genotype LMD1 and differential linesresistant to races E, F, G and H. Broomrape seeds from tobacco agrocenosis germinated on all studied exudates,showing a high level of affinity to host plant. Therefore, the germination inductors specific to sunflower induced thegermination process of the parasite characteristic for the anthophytoses on tobacco plants. The average germina-tion rate on the root exudate of the sensible genotype LMD1 was 15,2% and on the exudate of the race H differential(HLG 5661) - 17,7%. Indicators significantly lower were noted in the other variants under study.
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