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- Author or Editor: Zaki Anwar Siddiqui x
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Abstract
Effects of Meloidogyne incognita, Pseudomonas syringae pv. pisi and Rhizobium leguminosarum were studied on growth and biochemical parameters of pea (Pisum sativum L.) in three soil types. Plants grown in 20% fly ash attained higher plant growth, chlorophyll and carotenoid followed by loam soil and 20% sand. Inoculation of R. leguminosarum resulted in increased plant growth, nodulation, chlorophyll and carotenoid over control. Root nodulation and proline contents were high in plants grown in 20% sand and least in 20% fly ash. Inoculation of M. incognita prior to P. syringae pv. pisi resulted in a greater reduction in plant growth, nodulation, chlorophyll and carotenoid content and least where P. syringae pv. pisi was inoculated prior to M. incognita. Inoculation of pathogens increased proline contents. Galling and population of M. incognita was high in 20% sand followed by loam soil and fly ash amended soil. P. syringae pv. pisi and R. leguminosarum had adverse effect on galling and nematode population. The principal component analysis identifies interaction of pathogens and showed segregation of various treatments in the plots.
Abstract
Effects of Pseudomonas putida and zinc oxide nanoparticles (ZnO NPs) alone and in combination was observed in plants grown with bacterized seeds with Rhizobium leguminosarum for the management of Meloidogyne incognita and Pseudomonas syringae pv. pisi on pea (Pisum sativum). Inoculation of M. incognita and P. syringae pv. pisi alone and both together reduced plant growth, chlorophyll and carotenoid content over uninoculated control. Use of P. putida and ZnO NPs 0.10 ml−1 (foliar spray/seed priming) alone and in combination resulted in a significant increase in plant growth, chlorophyll, and carotenoid in pathogen-inoculated plants. Seed priming with ZnO NPs was better than NPs foliar spray in increasing plant growth, chlorophyll and carotenoid content of plants with pathogens. Use of P. putida plus NPs seed priming was better than its use with foliar spray in increasing plant growth, chlorophyll, and carotenoid. Bacterization with R. leguminosarum caused sufficient root nodulation and nodulation was better in plants with P. putida than in plants with ZnO NPs. Both test pathogens had adverse effect on root nodulation. Blight disease indices, galling, and nematode population were also greatly reduced when P. putida was used with ZnO NPs seed priming.
