PJB-2019-430
Ecological characteristics, genetic variability analysis, and allelopathic control of Brassica tournefortii Gouan in northern Saudi Arabia
Moodi alsubeie
Abstract
The aim of the present study was to identify the communities of B. tournefortii Gouan in the Al-Jouf region of northern Saudi Arabia, to determine the ecological amplitude, soil factors controlling distribution, genetic variability, and allelopathic control of this species. Plant communities dominated by B. tournefortii were investigated in 15 localities. Presence-absence data for each species were determined. Data were analyzed usingmultivariate analyzes. A collection of 15 Saudi Arabian B.Tournefortii populations were evaluated using five morphological traits. Analysis of variance and correlation coefficient calculations were performed using the R (3.4.4) software package. Soils representing each community were analyzed using eleven physico-chemical parameters. The allelopathic effects of Portulaca oleracea and Pulicaria undulata and their mixtures on germination, seedling root, and shoot growth of B. tournefortii were investigated. Classification applications of the PAST software program based on 83 species were used to recognize three vegetation clusters. Canonical correspondence analysis demonstrated that soil parameters contributed significantly to species distribution. The dendrogram based on genetic distance using the UPGMA method revealed genetic drift between the studied populations. Genetic variability analysis revealed remarkable variability in the number of seeds per plant (cv=19.522) and number of pods per plant (cv=11.663). Significant differences between populations were noted for most morphological traits (P ≤ 0.05). The water extracts of Portulaca oleracea and Pulicaria undulata could be applied at a concentration of 10 g/L for the management of this species.
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