Resistance evaluation of new sugar beet half-sib families for rhizomania disease in naturally infected field conditionύ
2014
Soltani Ideliki, J. | Shahbazi, H. | Ahmadi. M. | Mohammadi Haza, H. | Mahzoni, J.
Rhizomaniaand rhizoctonia root and crownrotdiseasesarecommon throughouttheprovince of Khorasan Razavi.Frombreeders point of view, geneticresistancetosoilbornediseaseis consideredthe most effective way to reduce losses. Therefore, to achieve a resistant variety, it is necessary to evaluate and identify resistant parents. For this purpose, 224 half-sib families and 28 parental pollinators lines resistant to Rhizoctonia solaniwere plantedinthree replicationsin arandomized completeblock design withfive-meter-long row at the rhizomania infected farm.The resultsshowed that thelinesaresignificantly different(p%5)fortraitssuch asroot yield, sugar content, sugar yeild, the percentage of infection and leaf greening.LineS2-13had the highestroot andsugaryield following the resistant check and line S2-16hadthe lowest yield and groupdsusceptible cultivar.The results of thisstudy showed that the roots of 14.28 percent of half-sibs do not have symtomps of rhizomaniainfection.Thistraitwas significantly differentamongthehalf-sib families. The results showed that, thehalf-sibs such asHS6, HS16, HS26, HS8 and HS17 had the highest percentage of resistant plants.Despit the goodresistance, thelineshadlowerroot yield and nonunformroots.At harvest time,somehalf-sibs with good root shapewereselected for full-sibfamily production.The seedswere plantedin 2013.The plants will becrossedwithamale sterilesingle cross in 2014 andhybridseedswithdoubleresistanceto rhizomania andrhizoctonia will be producted.
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