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<p>Aromatic plants are essential to Latin American culinary culture. Among them, Crotalaria longirostrata (chipilín) is valued for its nutrient content and traditional use. However, scientific efforts to enhance its nutritional quality via microbial biofortification remain limited. This study aimed to evaluate the effects of native rhizobial strains on the growth and nutrient content of chipilín.&#xa0;Six treatments were evaluated: T1: (R7 + YEM-Ca²⁺) consisted of Sinorhizobium mexicanum ITTG-R7T in yeast extract mannitol medium plus Ca²⁺; T2: (R7 + EXT-Ca²⁺) consisted of ITTG-R7T with yeast extract plus Ca²⁺; T3: (ACO-34 A + YEM-Ca²⁺) consisted of Rhizobium sp. ACO-34 A in yeast extract mannitol medium plus Ca²⁺; T4: (ACO-34 A + EXT-Ca²⁺) consisted of ACO-34 A with yeast extract plus Ca²⁺; T5: chemical fertilizer (positive control); T6: no inoculum and no fertilizer (negative control). Morphometric parameters and macro/micronutrient content in leaves were measured after 50 days. Nutrient concentrations were analyzed using ICP-OES.&#xa0;R7 + EXT-Ca²⁺ significantly enhanced biological yield parameters such as plant length, weight, and stem diameter. In contrast, ACO-34 A + YEM-Ca²⁺ significantly increased leaf concentrations of P, Ca, Mg, S, Fe, Mn, Cu, B, and Ni (p &lt; 0.05). Urea and the non-inoculated control showed the lowest performance in both yield and nutrient content. The effects of inoculation varied depending on the culture medium used for bacterial preparation.&#xa0;Rhizobial strains enhance chipilín’s growth and nutrition, influenced by strain and carbon growing source. These findings support the development of biofortification strategies for culturally significant and accessible crops.</p>

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Improving Nutritional Quality of Chipilín (Crotalaria longirostrata) Via Rhizobial Biofortification Under Different Inoculum Carbon Sources

  • 期刊论文

  • 发表日期：

    2026年1月8日

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  • Valeria Mumenthey-Zorrilla,
  • Luis Alberto Manzano-Gómez,
  • Reiner Rincón-Rosales,
  • Diana Rubí Oropeza-Tosca,
  • Francisco Alexander Rincón-Molina,
  • Clara Ivette Rincón-Molina

摘要

Aromatic plants are essential to Latin American culinary culture. Among them, Crotalaria longirostrata (chipilín) is valued for its nutrient content and traditional use. However, scientific efforts to enhance its nutritional quality via microbial biofortification remain limited. This study aimed to evaluate the effects of native rhizobial strains on the growth and nutrient content of chipilín. Six treatments were evaluated: T1: (R7 + YEM-Ca²⁺) consisted of Sinorhizobium mexicanum ITTG-R7T in yeast extract mannitol medium plus Ca²⁺; T2: (R7 + EXT-Ca²⁺) consisted of ITTG-R7T with yeast extract plus Ca²⁺; T3: (ACO-34 A + YEM-Ca²⁺) consisted of Rhizobium sp. ACO-34 A in yeast extract mannitol medium plus Ca²⁺; T4: (ACO-34 A + EXT-Ca²⁺) consisted of ACO-34 A with yeast extract plus Ca²⁺; T5: chemical fertilizer (positive control); T6: no inoculum and no fertilizer (negative control). Morphometric parameters and macro/micronutrient content in leaves were measured after 50 days. Nutrient concentrations were analyzed using ICP-OES. R7 + EXT-Ca²⁺ significantly enhanced biological yield parameters such as plant length, weight, and stem diameter. In contrast, ACO-34 A + YEM-Ca²⁺ significantly increased leaf concentrations of P, Ca, Mg, S, Fe, Mn, Cu, B, and Ni (p < 0.05). Urea and the non-inoculated control showed the lowest performance in both yield and nutrient content. The effects of inoculation varied depending on the culture medium used for bacterial preparation. Rhizobial strains enhance chipilín’s growth and nutrition, influenced by strain and carbon growing source. These findings support the development of biofortification strategies for culturally significant and accessible crops.