Development of rhizoctonia tolerant pollinators in sugar beet
2014
Soltani Ideliki, J. | Pedram, A. | Ebrahimi Kolaee, H. | Abdollahian Noghabi, M. | Darabi, S. | Ahmadi, M. | Mahmodi, S.B. | Sabeghi, H. | Salarikhah, M. | Mahzoni, J. | Chaharmahali, M. | Saiari, S. | Mosadeghi, M.
Root and crown rot caused by Rhizoctonia solani, is one of the limiting factors in most sugar beet growing areas in Iran, especially Khorasan Razavi province.Cultivation of resistant varieties is the most effectivemethod of disease control, whilethe safest way to protect the environment .In the world over the past 20 years, more than 17 germplasm resistant to rhizoctonia have been released that the population FC-703 is one of them.In order to produce varieties resistant to rhizoctonia, 28 resistant progenies(based onmicro plotassessment) were developed from this population. The progenies were crossed with a monogerm single cross (7112*SB36) in 2011 to develop new hybrids. The hybrids along with seven domestic and foreign resistant checks and a susceptible check were evaluated for yield in Hamedan (non-infected condition) and Khorasan (infected condition)in 2012. Based on the results, 15 hybrids were chosen which comparedagain in another trial in the regions Mashhad, Zarghan, Karaj and Miandoab in 2013. According to the comparison of the average of white sugar yield, most of the hybrids had good performance in non-infected area (Karaj), but in infected condition, all the hybrids produced less sugar than foreign varieties. In comparison to domestic checks, the new hybrids (7112*SB36)*S1-12 and (7112*SB36)*S1-24 produced 21 and 27 percent more yield respectively. Therefore, the pollinators of these hybrids can be introduced into new programs to improve their resistance and quality.
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