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Antonova T.S.,All Russia Research Institute Of Oil Crops By The Name Of Vs Pustovoit Vniimk | Araslanova N.M.,All Russia Research Institute Of Oil Crops By The Name Of Vs Pustovoit Vniimk | Strelnikov E.A.,All Russia Research Institute Of Oil Crops By The Name Of Vs Pustovoit Vniimk | Ramazanova S.A.,All Russia Research Institute Of Oil Crops By The Name Of Vs Pustovoit Vniimk | And 2 more authors.
Helia | Year: 2011

During the last years in Rostov region of Russian Federation highly virulent biotypes of broomrape have propagated, affecting both hybrids of foreign breeding, and the native sunflower assortment, which used to be resistant earlier. Apart from that, the resistance of some known European sunflower types to broomrape races had disappeared, which testifies about the presence of the races F, G, H in the region at least. Consequently, the search of the sources of resistance is urgent. 14 samples of annual and 27 of perennial wild sunflower from the collection of Kuban experimental station VIR were tested for resistance to the most virulent broomrape population. From the annual species only H. petiolaris had weak degree of affection (1-3 tubercles/plant), while the other were affected to a high degree. The majority of perennial sunflower samples have shown the immunity. Perennial wild species of the sunflower of the same name that were used earlier in the research of Ruso et al. (1996) as resistant species against the Spanish populations of broomrape, show resistance also to high virulent O. cumana, which had propagated in the Rostov region of the Russian Federation. The immunity to broomrape of the studied wild perennial sunflower samples is not related to the absence of stimulating effect of root exudations on the seeds of the parasite. The immunity is more likely connected to physiologicalbiochemical features of cortex root cells. Source


Antonova T.S.,All Russia Research Institute Of Oil Crops By The Name Of Vs Pustovoit Vniimk | Araslanova N.M.,All Russia Research Institute Of Oil Crops By The Name Of Vs Pustovoit Vniimk | Strelnikov E.A.,All Russia Research Institute Of Oil Crops By The Name Of Vs Pustovoit Vniimk | Ramazanova S.A.,All Russia Research Institute Of Oil Crops By The Name Of Vs Pustovoit Vniimk | And 2 more authors.
Helia | Year: 2012

In the tubercle of O. cumana of high-virulent populations from Rostov region of Russian Federation some changes were found, which helped to improve the seed productivity and to decrease the development period of fruiting shoots. The maintenance of high level of seed productivity can be realized by setting multiple meristematic zones in a tubercle and simultaneous development of several adventive shoots from them. The maintenance of viability of tubercle and the formation of new shoot apexes after the seed ripening on one or several stems, grown out of it and finished in the vegetation period, also go in the favour of the improvement of seed productivity. The development of the apexes of tubercle rudimentary roots into adventive shoots was observed in this paper. The polymorphism of inflorescence in the quantity of the setting flowers and their distribution along the stem and even below the soil level was observed. The flowering ability of flowers, hidden in the soil, and the seed formation in them, was defined. All that leads to the improvement of seed productivity of individual plant. On the whole, the described peculiarities of the development of O. cumana show that there is an accumulation of traits, which goes in the favour of the high potential of reproductive function in parasite's ontogenesis. Source

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