Endophytic bacteria affect sugarcane physiology without changing plant growth

Bragantia

Fernanda Castro Correia Marcos¹  Raquel De Paula Freitas Iório¹  Adriana Parada Dias Da Silveira¹  Rafael Vasconcelos Ribeiro¹  Eduardo Caruso Machado¹  Ana Maria Magalhães De Andrade Lagôa¹ 

关键词: Saccharum spp.;    plant-bacteria interaction;    photosynthesis;    nitrogen;    mini stalks with one bud;   

DOI  :  10.1590/1678-4499.256

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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