Phytotoxicity of Argemone ochroleuca L. on Germination and Seedling Growth of Sorghum bicolor L. Varieties under In vitro Condition

摘要

Argemone ochroleuca L. is invasive weed with biological suppression on the neighboringcrops by a phenomenon of allelopathy. This study was aimed to examine the potential allelopathic effect ofA. ochroleuca root, stem and leaf extracts on the widely cultivated Sorghum bicolor varieties (Melkam, Gerana1 and Farmers Cultivar). Complete randomized design was employed. The root, stem and leaf extracts wereprepared at concentrations of 5%, 10 % and 15 % and Multivariate Analysis (Two way - ANOVA) was usedto analyze relevant data. Extracts caused marked reduction in the seedling growth rates with increasingextraction concentrations and the greatest inhibition of radical length (0.5±0.2cm), plumule length (0.83±0.1cm),germination number (0.33±0.5), germination percent (2.2±0.4), mean germination time (1.7±2.9), vigor index(0.02±0.0) and germination energy (0.1±0.1) produced by root extracts in 15 % concentration in the farmers’cultivar followed by stem and leaf extracts. The overall results indicated the strong phytotoxic effect presentin all varieties. However, comparably higher resistance to the allopathic effect of A. ochroleuca was observedin Melkam S. bicolor variety. The results suggest that integrated management option lunched to improveproductivity and sustainability.