Morphoanatomical and Biochemical Changes in the Roots of Rice Plants Induced by Plant Growth-Promoting Microorganisms

Rêgo, Marcela Cristiane Ferreira; Ilkiu-Borges, F.; Filippi, Marta Cristina Corsi de; Gonçalves, LO; Silva, Gisele Barata da

doi:10.1155/2014/818797

Cited by 52 publications

(34 citation statements)

References 36 publications

(37 reference statements)

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“…and Burkolderia sp. have attested their growth-promoting potential in rice Rêgo, Borges, Filippi, Gonc ßalves, & Silva, 2014) and Brachiaria brizantha (Lopes et al, unpublished). These rhizobacteria are known to increase the auxin synthesis, nutrient uptake (e.g., nitrogen, phosphorus and iron), chlorophyll content, photosynthetic rate and biomass production (Ahemad & Kibret, 2014;Nascente et al, 2016).…”

mentioning

confidence: 99%

Light and plant growth‐promoting rhizobacteria effects on Brachiaria brizantha growth and phenotypic plasticity to shade

Lopes

Dias‐Filho

Castro

et al. 2017

Grass and Forage Science

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This is the first report on the effect of light intensity and plant growth‐promoting rhizobacteria (PGPR) on the growth of a tropical forage grass, being a relevant study to improve pasture management in conventional farming and integrated crop‐livestock‐forestry systems. In this study, our aim was to evaluate the effects of light intensity and Burkholderia pyrrocinia and Pseudomonas fluorescens inoculation on Brachiaria brizantha cv. BRS Piatã growth, and phenotypic plasticity to shade. The experiment was conducted in a semi‐controlled environment. Seedlings of B. brizantha were allocated to full sun and shade. P. fluorescens and B. pyrrocinia were inoculated individually or co‐inoculated by soil drench, 14 days after seedling emergence. We evaluated morphogenesis, structural and growth parameters. Irrespective of the light regime, co‐inoculated plants had greater leaf area and SPAD index (chlorophyll content). Increase in total biomass production in co‐inoculated plants was over 100% and 300%, under full sun and shade respectively. Co‐inoculated P. fluorescens and B. pyrrocinia increased shade tolerance in B. brizantha, improving plant performance. Co‐inoculation promoted growth in B. brizantha under both sun and shade, indicating its potential as a bio‐fertilizer in conventional and integrated systems, especially in silvopastoral systems, where light availability to pasture growth may be limited.

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confidence: 99%

Light and plant growth‐promoting rhizobacteria effects on Brachiaria brizantha growth and phenotypic plasticity to shade

Lopes

Dias‐Filho

Castro

et al. 2017

Grass and Forage Science

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“…Control WR seeds had a 2% reduction in germination Mean values (mg g -1 Ms) obtained in a previous study by Rêgo et al (2014).…”

Section: Seed Germination Seedling Vigor and Growth Promotion In Plmentioning

confidence: 75%

“…Growth promotion can take place directly (inducing changes physiological, biochemical, molecular and morphological, anatomical) or indirect (through induction of resistance to biotic and abiotic stresses) defined by Bach et al (2016). Studies carried out by Filippi et al (2011), Rêgo et al (2014), Nascente et al (2016), and Bueno et al (2017), indicate that isolates BRM-32111 and BRM-32113, present action to promote growth in plants of both forms (direct and indirect).…”

Section: Seed Germination Seedling Vigor and Growth Promotion In Plmentioning

confidence: 99%

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The role of rhizobacteria in rice plants: Growth and mitigation of toxicity

Rêgo

Cardoso

Ferreira

et al. 2018

Journal of Integrative Agriculture

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Allelopathic compounds reduce the growth and productivity of upland rice plants, especially in consecutive plantations. The rhizobacteria Pseudomonas fluorescens BRM-32111 and Burkholderia pyrrocinia BRM-32113 have been recorded as growth promoters in rice. This study was developed to understand the effect of the application of rhizobacteria on upland rice plants in consecutive plantations. Experiments were conducted in a completely randomized design with four replications of four treatments: rice seed inoculated with P. fluorescens BRM-32111, rice seed inoculated with B. pyrrocinia BRM-32113 (both sown on soil with rice residue), non-inoculated plants sown on soil with rice residue (control with residue (WR)), and non-inoculated plants on soil with no residue (NR). Roots and seedling growth were adversely affected by allelopathic compounds in control WR plants. Plants inoculated with rhizobacteria P. fluorescens BRM-32111 or B. pyrrocinia BRM-32113 induced an increase of 88% in biomass, 3% in the leaf area, 40% in length, 67% in root biomass, 21% in chlorophyll a, 53% in chlorophyll (a+b), 50% in rate of carbon assimilation (A), 227% in A/rubisco carboxylation efficiency (C i) and 63% in water use efficiency (WUE) compared to control WR plants. These results indicate that rhizobacteria P. fluorescens BRM 32111 and B. pyrrocinia BRM 32113 increase the tolerance of rice plants to stress from allelochemicals. There are possible practical agricultural applications of these results for mitigating the effects of environmental allelochemistry on upland rice.

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“…It was observed that rice plants, when faced with a biotic stimulus, such as inoculation of fungi isolate, had higher deposition of lignin in their roots, which varied according to the fungi isolate (Rêgo et al 2014). Thus, cassava genotypes with this characteristic may be more adapted to poorly drained soils, preventing root rot.…”

Section: Discussionmentioning

confidence: 99%

Morphoanatomy and histochemistry analyses of cassava roots do not discriminate resistant from susceptible genotypes to soft root rot

et al. 2017

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Cassava is an important culture in Brazil and in the North of the country, and soft root rot has affected root production. The aim of this work was to identify root morphoanatomic and histochemical characters associated with root rot resistance. In areas with no occurrence of the disease, nine cassava genotypes were tested, four of which were resistant, and five were susceptible to root rot. Root harvest was carried out twelve months after sowing, and thickness of suber, suber and cortex, and secondary xylem were measured. Moreover, texture, suber cell layers, lignin content, and lignin monomers content of the portion suber and cortex were analyzed. Also, histochemical tests and scanning electron microscopy (SEM) analyses of the roots were performed. Results were subjected to analysis of variance, and means were compared by the Scott-Knott test (p ≤0.05). The characters thickness of suber and cortex at proximal and medium portions, thickness of secondary xylem at medium and apical portions, number of cell layers of suber, thickness of suber, and root texture showed differences among genotypes; however, the characters could not be associated with resistance or susceptibility. There were no differences for: vessel elements, lignin and lignin monomers, and for the histochemical tests with Sudan IV and Lugol. Images of SEM showed differences among genotypes, which could not be associated with resistance or susceptibility. Thus, the characters evaluated cannot be used in selection for cassava resistance to soft root rot in genetic breeding programs. KEYWORDS: Anatomy; morphological characterization; genetic breeding; Manihot esculenta Morfoanatomia e histoquímica de raízes de mandioca não diferenciam genótipos resistentes e suscetíveis a podridão mole da raiz RESUMO A mandioca é uma cultura importante no Brasil e no Norte do país, e a podridão mole da raiz tem afetado a produção. O objetivo deste trabalho foi identificar caracteres morfoanatômicos e histoquímicos da raiz associados à resistência à podridão da raiz. Em áreas sem ocorrência da doença, nove genótipos de mandioca foram testados, quatro resistentes e cinco suscetíveis. A colheita da raiz foi realizada doze meses após o plantio e medidas de espessura do súber, súber e cortex e xilema secundário foram realizadas. Além disso, foram analisados a textura, as camadas de célula do súber, o conteúdo de lignina e os monômeros de lignina da porção súber e cortex. Ainda, testes histoquímicos e microscopia eletrônica de varredura (MEV) das raízes foram realizados. Os resultados foram submetidos à análise de variância e as médias foram comparadas pelo teste de Scott-Knott (p≤0.05). Os caracteres: espessura de súber e córtex nas porções mediana e proximal, espessura do xilema secundário nas porções mediana e apical, número de camadas de células do súber, espessura do súber e textura da raiz apresentaram diferenças entre os genótipos, mas não associadas à resistência ou suscetibilidade. Não houve diferenças para: elementos de vaso, lignina e monômeros de lignina...

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Morphoanatomical and Biochemical Changes in the Roots of Rice Plants Induced by Plant Growth-Promoting Microorganisms

Cited by 52 publications

References 36 publications

Light and plant growth‐promoting rhizobacteria effects on Brachiaria brizantha growth and phenotypic plasticity to shade

Light and plant growth‐promoting rhizobacteria effects on Brachiaria brizantha growth and phenotypic plasticity to shade

The role of rhizobacteria in rice plants: Growth and mitigation of toxicity

Morphoanatomy and histochemistry analyses of cassava roots do not discriminate resistant from susceptible genotypes to soft root rot

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