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King Abdulaziz University (2012)

Study the Associative Impact of Azospirillum sp. and Rhizobium sp. on Wheat Plants Grown under Certain Heavy Metals Stress

Al-Gharbawi, Haya Taher

Titre : Study the Associative Impact of Azospirillum sp. and Rhizobium sp. on Wheat Plants Grown under Certain Heavy Metals Stress

Auteur : Al-Gharbawi, Haya Taher

Université de soutenance : King Abdulaziz University

Grade : Master 2012

Résumé
A greenhouse experiment was conducted to investigate the associative impact of Azospirillum sp. and Rhizobium sp. on wheat plant grown under stress of tow heavy metals i.e, zinc and cadmium. The selected heavy metals were dosed at tow concentrations (200 and 300 ppm). The obtained results showed that cadmium had a pronounced inhibitive impact on growth of both bioremediators in comparison with the effect of zinc. The toxic effect of zinc was started at 300 ppm that produced 90% wheat seeds germination while toxic effect of cadmium started at 50 ppm that resulted in 90% germination too. Application of the tested bioremediators neutralized the adverse effect of heavy metals on wheat growth. It was observed that the inoculation with Azospirillum and/or Rhizobium in the presence of Cd or Zn at both concentrations significantly increased roots nitrogen content at flowering stage when compared to the treatments that received cadmium only but not zinc. P and K content at both growth stages were not significant same as the content of N, P, K of shoots at both growth stages, it was found that no significant differences were recorded. Heavy metals content of roots and shoots at both growth stages flowering and fruiting were accumulated in the root system more than aerial parts. Addition of bioremediators to soil raised the nitrogen content and reduced the soil content of both tested heavy metals in most treatment at both growth stages and enriched the soil with microorganisms, the total microbial load of soil in fruiting stage was more than those recorded in flowering stage. For wheat yield no significant differences were recorded for seeds dry weight and macro elements content while the seeds numbers per spike were differed significantly and the cadmium content of wheat seeds was lower than to be detected.

Présentation

Page publiée le 22 décembre 2014, mise à jour le 9 novembre 2017