Abstract
The aim of this study was to evaluate if endophytic bacteria inoculants would be beneficial to the sugarcane varieties IACSP94-2094 and IACSP95-5000, promoting changes in photosynthesis and plant growth. The plants, obtained from mini stalks with one bud, were treated with two bacteria mixtures (inoculum I or II) or did not receive any inoculum (control plants). The inocula did not affect shoot and root dry matter accumulation as compared to the control condition (plants with native endophytic bacteria). However, photosynthesis and electron transport rate (ETR) increased in IACSP94-2094 treated with the inoculum II, whereas the inoculum I enhanced photosynthesis and stomatal conductance in IACSP95-5000. The inoculum II caused increase in leaf sucrose concentration of IACSP94-2094 and decrease in IACSP95-5000 leaves. Leaf nitrogen concentration was not affected by treatments, but bacteria inoculation increased nitrate reductase activity in IACSP95-5000, and the highest activity was found in plants treated with the inoculum II. We can conclude that bacteria inoculation changed sugarcane physiology, improving photosynthesis and nitrate reduction in a genotype-dependent manner, without promoting plant growth under non-limiting conditions.
Highlights
The interaction between plants and microorganisms is quite complex and depends on organisms involved and environmental conditions, being affected by plant physiological status and nutrition (Oliveira et al 2006; Moutia et al 2010)
Leaf nitrogen concentration was not affected by treatments, but bacteria inoculation increased nitrate reductase activity in IACSP95-5000, and the highest activity was found in plants treated with the inoculum II
IACSP94-2094 roots presented 66.7 × 105 CFU∙g–1 when inoculated with the inoculum I and 74.8 × 105 CFU∙g–1 when inoculated with the inoculum II, whereas the control plants had 16.7 × 105 CFU∙g–1
Summary
The interaction between plants and microorganisms is quite complex and depends on organisms involved and environmental conditions, being affected by plant physiological status and nutrition (Oliveira et al 2006; Moutia et al 2010). In order to assess the effects of bacterial isolates on plant physiology, most studies use plants free of microorganisms as micropropagated ones and evaluate the inoculation of only one bacterium species in plant material (Singh et al 2011). Under such conditions, some specific changes due to plantmicroorganism interaction have been revealed (Oliveira et al 2006); such response may be different from those ones found in plants when more than one bacterium is present (such as in mini stalk with one buds) or when the inoculum is confronted with soil native microorganisms. Sugar beet plants treated with endophytic bacteria showed higher potential
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