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<p>The production of high-quality <i>Prunus</i> seedling rootstocks in soilless systems requires optimizing the interaction between genetics, nutrient availability, and rhizosphere microbiology. This study evaluated the morphophysiological response of four peach rootstock genotypes (‘Capdeboscq’, “Okinawa Roxo”, “NR0060408”, and “NR0160305”) to inoculation with <i>Trichoderma asperellum</i> and a microbial consortium (<i>Bacillus amyloliquefaciens</i> + <i>Trichoderma harzianum</i>), under contrasting doses of controlled-release fertilizer (0 and 4&#xa0;g dm<sup>− 3</sup> of CRF). Longitudinal analysis (0-120 days) demonstrated that nutrient availability is the primary limiting factor; microbial bioinputs did not compensate for the absence of fertilization due to the metabolic cost of symbiosis. However, under nutrient sufficiency (4&#xa0;g dm<sup>− 3</sup>), strong synergism was observed. The new selections (“NR0060408” and “NR0160305”) exhibited high phenotypic plasticity, maximizing the conversion of biostimulation into shoot biomass and outperforming the “Okinawa Roxo” genotype, which displayed a conservative growth strategy. The <i>Bacillus</i>-<i>Trichoderma</i> consortium was superior to single inoculation in responsive genotypes, potentiating seedling leaf area and height. Furthermore, inoculation promoted the “stay-green” effect, maintaining chlorophyll index stability until the end of the cycle. It is concluded that the use of bioinputs, especially in a consortium, acts as a metabolic catalyst in responsive genotypes, but their efficacy depends on adequate basal nutritional management.</p>

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Synergism Between Controlled-Release Fertilization and Microbial Bioinputs Modulates the Morphophysiological Quality of Prunus Rootstock Genotypes

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月3日

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  • João Antônio Paraginski,
  • Mariana Poll Moraes,
  • Newton Alex Mayer,
  • Valmor João Bianchi

摘要

The production of high-quality Prunus seedling rootstocks in soilless systems requires optimizing the interaction between genetics, nutrient availability, and rhizosphere microbiology. This study evaluated the morphophysiological response of four peach rootstock genotypes (‘Capdeboscq’, “Okinawa Roxo”, “NR0060408”, and “NR0160305”) to inoculation with Trichoderma asperellum and a microbial consortium (Bacillus amyloliquefaciens + Trichoderma harzianum), under contrasting doses of controlled-release fertilizer (0 and 4 g dm− 3 of CRF). Longitudinal analysis (0-120 days) demonstrated that nutrient availability is the primary limiting factor; microbial bioinputs did not compensate for the absence of fertilization due to the metabolic cost of symbiosis. However, under nutrient sufficiency (4 g dm− 3), strong synergism was observed. The new selections (“NR0060408” and “NR0160305”) exhibited high phenotypic plasticity, maximizing the conversion of biostimulation into shoot biomass and outperforming the “Okinawa Roxo” genotype, which displayed a conservative growth strategy. The Bacillus-Trichoderma consortium was superior to single inoculation in responsive genotypes, potentiating seedling leaf area and height. Furthermore, inoculation promoted the “stay-green” effect, maintaining chlorophyll index stability until the end of the cycle. It is concluded that the use of bioinputs, especially in a consortium, acts as a metabolic catalyst in responsive genotypes, but their efficacy depends on adequate basal nutritional management.