Testing Sunflower Inbred Lines for Tolerance to Phoma Black Stem
Iznalaženje izvora tolerantnosti za prouzrokovača crne pegavosti stabla suncokreta
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Author
Dedic, Bosko
Keywords
SunflowerPhoma macdonaldii
Tolerance
Inbred lines
Suncokret
otpornost
inbred linije
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Show full item recordAbstract
Phoma black stem is caused by a widespread pathogen Phoma macdonaldii Boerema.
The disease occurs regularly, causing damage by early defoliation and premature ripening.
Complete resistance of sunflower to this disease has never been found, but there are
reports of differences in response by different genotypes. Fifty-four new inbred lines were
tested in our trials conducted at the Rimski Šanèevi experimental field. Plants in one trial
were non-irrigated, and irrigated in another. Sunflower plants were artificially inoculated
with mycelial plugs in the bud stage. The length of stem lesions was measured and compared
using an analysis of variance. Disease intensity was generally more severe in the nonirrigated
field. There were significant differences in tolerance to Phoma black stem among
the tested lines in both trials. The percentage of tolerant genotypes was 1.8%. Crnu pegavost stabla suncokreta prouzrokuje široko rasprostranjen patogen Phoma
macdonaldii Boerema. Pojava bolesti je stalna na skoro svim područjima gajenja suncokreta,
a štete nastaju usled defolijacije i ranog sazrevanja suncokreta. Potpuna otpornost na ovu
bolesti nije poznata, a dokazan je različit nivo osetljivosti ispitivanih genotipova. Istraživanje
sprovedeno na eksperimentalnom polju Rimski Šančevi je podrazumevalo testiranje 54
nove inbred linije. Ogled se sastojao iz dva odvojena dela. Prvi deo se nalazio u sistemu za
navodnjavanje, a drugi u uslovima suvog ratarenja. Biljke suncokreta su veštački inokulisane
micelijom gljive u fazi butonizacije. Nakon inokulacije merena je dužina lezija na stablu, a
podaci su upoređeni putem analize varijanse. Značajno veći intenzitet bolesti je zabeležen
u uslovima suvog ratarenja. U oba dela ogleda zabeležene su značajne razlike u tolerantnosti
na crnu pegavost između linija stabla suncokreta. Od ukupnog broja testiranih linija 1,8%
je pokazalo zadovoljavajući nivo tolerantnosti.