Effect of some isolates of Aspergillus niger on onion) Allium capa L. ( bulbs rot and its control by hot extract of ginger | ||
| Kufa Journal for Agricultural Science | ||
| Article 1, Volume 9, Issue 4, December 2017, Pages 181-199 | ||
| Authors | ||
| Burair Ahmed Nasir Gammaaz; Majeed M. Dewan | ||
| Abstract | ||
| Pathogenicity test of 13 isolates of A.niger on onion bulbs revealed that all tested of onion cultivars, Texas Early Grano (TEG) , Early White Grano (EWG) and Red Baron (RB) , were susceptible to all tested isolates . However, the isolate 3 was the most distrutivars isolate that caused diagonal damage on bulbs that reached 4.29 cm . while the EWG was a highly effected cultivars by all isolates , the mean diagonal damage was 2.19 cm during of 4 weeks. Exudates of A.niger isolates also had the ability to rot bulbs and caused diagonal damage, the isolate 7 caused highly affected diagonal damage of 4.19 cm, while the cultivar RB was the most affected cultivar by all tested isolates,the diagonal damage mean of this cultivars was 2.17 cm . The isolate 3, among all tested isolates, was the most pathogenicity of all cultivars. Also the result of dipping of bulbs in a hot extract of ginger for 5 minutes showed decreasing in bulbs infection by blak rot rot . Isolate 3 had the ability to produce ochratoxin , aflatoxin B1 and aflatoxin B2 in the infected bulbs , the ochratoxin had the highest concentration in infected parts reaching to 1.129 mg.ml-1. The non-infected part of bulb, showed containing of ochratoxin, aflatoxin B1 and aflatoxin B2 at concentrations of 0.449 , 0.188 and 0.162 mg.ml-1 , respectively . | ||
| Keywords | ||
| Aspergillus niger; Ochratoxin; Aflatoxins; Onion; ginger; niger | ||
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