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 (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 (Br5).
Bacterial inoculation with isolate (Br5) 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 Br5 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 Br5.
Bacterial inoculation improved the plant height, boll weight, number of bolls
plant-1 and seed cotton yield with Br5 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.
Rhizobium species PGPR auxin biosynthesis growth and yield cotton
Birincil Dil | İngilizce |
---|---|
Bölüm | Articles |
Yazarlar | |
Yayımlanma Tarihi | 1 Nisan 2019 |
Yayımlandığı Sayı | Yıl 2019 Cilt: 8 Sayı: 2 |