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2014, vol. 65, br. 2, str. 64-69
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Ispitivanje osetljivosti različitih genotipova lucerke prema Colletotrichum trifolii
Assessment of sensitivity of different alfalfa genotypes to Colletotrichum trifolii
aInstitut za krmno bilje, Kruševac, Srbija bUniverzitet u Beogradu, Poljoprivredni fakultet, Srbija
e-adresa: tanja.vasic@ikbks.com
Projekat: Poboljšanje genetičkog potencijala i tehnologija proizvodnje krmnog bilja u funkciji održivog razvoja stočarstva (MPNTR - 31057)
Sažetak
Južna antraknoza ili trulež krune lucerke, izazvana gljivom Colletotrichum trifolii je bolest koja nanosi značajne štete na lucerki u Srbiji. U toku šestogodišnjeg perioda, u periodu leta i rane jeseni, sakupljane su biljke lucerke sa simptomima anraknoze. Stabljične infekcije izazivaju sušenje i povijanje gornjeg dela biljke, što dovodi do karakterističnog simptoma tzv. 'pastirska kuka'. Ispitivanje stepena osetljivosti različitih genotipova lucerke u eksperimentalnim uslovima obavljeno je sa jednim izolatom Coll-4 (C. trifolii poreklom iz Srbije) i jednim referentnim izolatom C-86-2 rasa 1. Deset komercijalnih genotipova lucerke različitog geografskog porekla (K-1, K-28, Zaječarska 83, Osječka 12, NS Slavija, Banja Luka, Affinity 401 + Z, Florida 77, Vernal S i Pery) ispitivano je u ovom radu. Inokulisane biljake lucerke pokazale su tipične simptome antraknoze. Nekrotične lezije pojavile su sa na stabljikama zaraženih biljaka i došlo je do povijanja u gornjoj trećini stabala. Micelija parazita prorasta niz stablo i kada se stabljike osuše, nastupa antraknoza krune i korena. Osetljivost različitih genotipova lucerke prema ispitivanim izolatima C. trifolii određena je prema skali od 0-5. Ispitivani genotipovi lucerke su ispoljili različitu osetljivost prema testiranim izolatima vrste C. trifolii.
Abstract
Southern anthracnose or crown rot, caused by Colletotrichum trifolii, is a disease that has been detected on alfalfa in Serbia. During a 6-years period, especially in summer and autumn, alfalfa plants with anthracnose symptoms were studied in the field. Stem infection resulted in wilting and death of the upper portion of the steam, giving rise to the characteristic 'shepherd's crook' symptom. To examine the level of sensitivity of different alfalfa genotypes in experimental conditions, one isolate: Coll-4 (C. trifolii originating from Serbia) and one reference isolate C-86-2 (races 1) C. trifolii were used. Ten commercial alfalfa genotypes of different origin (K-1, K-28, Zajecarska 83, Osjecka 12, NS Slavija, Banja Luka, Affinity 401 + Z, Florida 77, Vernal S and Perry) were examined in this study. Infected plants showed typical symptoms of anthracnose. Necrotic lesions appeared on the plant stems and gentle bending of the top of the upper third of stems occurred on tested plants. Necrotic lesions further spread onto the whole plant and in some plants led to withering. Assessment of damage by pathogen inoculation was based on the scale of 0-5. Investigated genotypes showed contrasting resistances to C. trifolii isolates.
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