Relative potential of rhizobium species to enhance the growth and yield attributes of cotton (Gossypium hirsutum L.)

Authors : M Amjad QURESHİ, Haroon SHAHZAD, M Sajjad SAEED, Sana ULLAH, M Asif ALİ, Fakhar MUJEEB, Ma ANJUM

Pages : 159-166

Doi:10.18393/ejss.544747

View : 41 | Download : 11

Publication Date : 2019-04-01

Article Type : Research Paper

Abstract :Legumes compensate mineral fertilizer by fixing nitrogen due to the specialized structures i.e. nodules by Rhizobium species. Literature revealed that legumes fixed nitrogen due to Rhizobium inoculation from 50-300 kg NPK ha -1 year -1 . Rhizobium besides nitrogen fixation, solubilized phosphates, produced growth hormones and due to its root colonizing ability improved the growth and yield of non-legumes also and performed as plant growth promoting rhizobacteria insert ignore into journalissuearticles values(PGPR);. Study was conducted to assess the relative efficiency of Rhizobium species for the growth and yield of cotton. Different isolates of five species of Rhizobium species responsible for different nodule formation in legumes were assessed for the auxin biosynthesis potential as IAA equivalents and isolates having higher values for IAA equivalents were used for experimentation. Results revealed that isolates of Rhizobium species improved the growth and physiological parameters of cotton. Higher values were root/shoot length and mass were observed with Rhizobium species of berseem insert ignore into journalissuearticles values(Br 5 );. Bacterial inoculation with isolate insert ignore into journalissuearticles values(Br 5 ); produced 60.94, 64.40 g shoot/root mass that is 16.70 and 23.80 % higher than control and percent increase improvements of cotton shoot/root length with Br 5 i.e. 18.3, 24.8 % higher than that of control. Higher values of IAA equivalents were observed in root/shoot content of cotton with isolate of Br 5 . Bacterial inoculation improved the plant height, boll weight, number of bolls plant -1 and seed cotton yield with Br 5 inoculation. The chlorophyll content, photosynthetic rate, transpiration rate and photo active radiation were also higher in the inoculated treatments. Results of present study clearly demonstrated that different isolates of Rhizobium species improved the growth and yield parameters of cotton and thus Rhizobium sp can be effectively utilized as bacterial inoculants in non-legumes.
Keywords : Rhizobium species, PGPR, auxin biosynthesis, growth and yield, cotton

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