A rapid test for detection of tribenuron-methyl resistance in sunflower

Abstract

A rapid laboratory test for detection of tribenuron-methyl resistant sunflower genotypes was developed. Four homozygous and four heterozygous tribenuron-methyl resistant hybrids, as well as a susceptible one were grown on MS medium supplemented with different concentrations of herbicide (2.0 µM, 2.5 µM, 3.0 µM, 3.5 µM and 4.0 µM) and with pH either 7 or 8. The effect of medium pH and herbicide concentration on above-ground part and root mass of sunflower seedlings was observed. The test enabled visual discrimination between resistant and susceptible genotypes in 5 days, and discrimination between homozygous and heterozygous resistant genotypes in 12 days. All tested herbicide concentrations and morphological parameters were found to be suitable for discrimination of tribenuron-methyl susceptible genotypes. The best pH and herbicide concentration combination and morphological parameter for discrimination between homozygous and heterozygous resistant sunflower genotypes were 3.0 µM at pH 7 and root mass, respectively.

Razvijen je brzi laboratorijski test za detekciju genotipova suncokreta otpornih na tribenuron metil. Po četiri hibrida suncokreta homozigotno i heterozigotno otporna na tribenuron metil, kao i jedan neotporan hibrid su gajeni na MS podlozi sa pH vrednošću ili 7 ili 8 i sa različitim koncentracijama herbicida Express 50X, čija je aktivna materija tribenuron-metil (2.0 µM, 2.5 µM, 3.0 µM, 3.5 µM i 4.0 µM). Ispitivan je uticaj pH i koncentracije herbicida u podlozi na masu nadzemnog dela i korena klijanaca testiranih hibrida. Vizuelne razlike između otpornih i neotpornog hibrida su uočene nakon 5 dana kulture, dok su se razlike između homozigotnih i heterozigotnih otpornih hibrida pojavile nakon 12 dana kulture. Sve testirane koncentracije herbicida i testirani morfološki parametri su se pokazali kao dobri za identifikaciju neotpornih genotipova. Najbolja kombinacija pH i koncentracije herbicida za razlikovanje homozigotnih od heterozigotnih otpornih genotipova je bila 3.0 µM na pH 7, a morfološki parametar masa korena.