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<p>Rootstock–scion interactions play an important role in regulating nutrient uptake and distribution in grafted fruit trees and thereby influence flowering and productivity. The present study examined nutrient dynamics, including macronutrients, micronutrients and the carbon-to-nitrogen (C/N) ratio, in leaves, buds and panicles of two contrasting mango cultivars, ‘Amrapali’ (regular bearer) and ‘Dashehari’ (alternate bearer). The scions were grafted on three polyembryonic rootstocks (‘Kurukkan’, ‘Olour’ and ‘PAM-2’) and a monoembryonic non-descript seedling (‘NDS’). Nutrient balance and interactions were evaluated using the Deviation from Optimum Percentage (DOP) index, Principal Component Analysis and Pearson correlation analysis. The results indicated significant stionic influence on nutrient accumulation across the rootstock–scion combinations. The NDS rootstock showed pronounced nutrient imbalance, with excessive nitrogen accumulation accompanied by lower concentrations of several other nutrients. In contrast, polyembryonic rootstocks generally improved nutrient balance. In the ‘Dashehari’ scion, the ‘Kurukkan’ rootstock reduced leaf nitrogen excess by 19.20% compared with ‘NDS’ and increased phosphorus by 57.14%, potassium by 86.11% and zinc by 164.29%, resulting in a 28.13% increase in the leaf C/N ratio. Similarly, in ‘Amrapali’, the ‘Olour’ rootstock increased leaf magnesium by 85.71% and copper by 48.57% compared with the NDS rootstock. The DOP index further revealed consistent nitrogen excess together with deficiencies of calcium, magnesium and certain micronutrients, particularly iron and zinc. Multivariate analyses indicated positive associations among nutrients such as Ca, Mg and B, which are linked with reproductive development, whereas antagonistic interactions between potassium and divalent cations (Ca and Mg) were more evident under the NDS rootstock. Overall, the results demonstrate that polyembryonic rootstocks improve nutrient balance and modify nutrient interactions within the scion. These findings highlight the importance of selecting appropriate rootstocks to maintain balanced nutrition and support stable flowering behaviour in grafted mango orchards.</p> Graphical Abstract <p></p>

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Rootstock-Mediated Nutrient Dynamics in Leaves, Buds and Panicles of Regular- and Alternate-Bearing Mango Cultivars

  • 期刊论文

  • 发表日期：

    2026年4月21日

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  • Hatkari Vittal,
  • Nimisha Sharma,
  • Akshay,
  • R. M. Sharma,
  • Nripendra Vikram Singh,
  • Narendra Singh,
  • Mahesh Chand Meena,
  • Tirunagari Rupesh,
  • Abeer Ali,
  • Vishal Kumar,
  • Anil Kumar Dubey,
  • Gyan P. Mishra,
  • Rakesh Pandey,
  • Rakesh Singh

摘要

Rootstock–scion interactions play an important role in regulating nutrient uptake and distribution in grafted fruit trees and thereby influence flowering and productivity. The present study examined nutrient dynamics, including macronutrients, micronutrients and the carbon-to-nitrogen (C/N) ratio, in leaves, buds and panicles of two contrasting mango cultivars, ‘Amrapali’ (regular bearer) and ‘Dashehari’ (alternate bearer). The scions were grafted on three polyembryonic rootstocks (‘Kurukkan’, ‘Olour’ and ‘PAM-2’) and a monoembryonic non-descript seedling (‘NDS’). Nutrient balance and interactions were evaluated using the Deviation from Optimum Percentage (DOP) index, Principal Component Analysis and Pearson correlation analysis. The results indicated significant stionic influence on nutrient accumulation across the rootstock–scion combinations. The NDS rootstock showed pronounced nutrient imbalance, with excessive nitrogen accumulation accompanied by lower concentrations of several other nutrients. In contrast, polyembryonic rootstocks generally improved nutrient balance. In the ‘Dashehari’ scion, the ‘Kurukkan’ rootstock reduced leaf nitrogen excess by 19.20% compared with ‘NDS’ and increased phosphorus by 57.14%, potassium by 86.11% and zinc by 164.29%, resulting in a 28.13% increase in the leaf C/N ratio. Similarly, in ‘Amrapali’, the ‘Olour’ rootstock increased leaf magnesium by 85.71% and copper by 48.57% compared with the NDS rootstock. The DOP index further revealed consistent nitrogen excess together with deficiencies of calcium, magnesium and certain micronutrients, particularly iron and zinc. Multivariate analyses indicated positive associations among nutrients such as Ca, Mg and B, which are linked with reproductive development, whereas antagonistic interactions between potassium and divalent cations (Ca and Mg) were more evident under the NDS rootstock. Overall, the results demonstrate that polyembryonic rootstocks improve nutrient balance and modify nutrient interactions within the scion. These findings highlight the importance of selecting appropriate rootstocks to maintain balanced nutrition and support stable flowering behaviour in grafted mango orchards.

Graphical Abstract