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Background and Aims <p>Interactions between silicon (Si) and phosphorus (P) in grapevine (<i>Vitis vinifera</i>) remain poorly understood. This study examined how Si fertilisation influences rhizosphere P availability by altering root malate and citrate exudation and P uptake in grafted grapevines grown under low-P soil conditions.</p> Methods <p>A field experiment was conducted in a vineyard with cv. Chardonnay grafted onto Kober 5BB rootstock, using rhizotrons that provided direct access to intact roots and their rhizosheath soil. Treatments included unfertilised control (–P, –Si), P fertilisation (+P), and Si fertilisation (+Si). Samples of rhizosheath soil, root exudates, and root/leaf tissues were taken at key growth stages (flowering, pea-sized berry, and veraison).</p> Results <p>Leaf P concentrations in +Si vines reached levels comparable to those in +P vines. Silicon fertilisation enhanced root exudation of citrate and malate relative to both the control and +P treatments, particularly at pea-sized berry stage. This was accompanied by enhanced expression of <i>VvPEPC</i> and <i>VvALMT1</i>. In roots, Si supply consistently upregulated <i>VvPHT1;1</i>, increasing transcript levels several-fold compared with the control across all growth stages, whereas P fertilisation downregulated <i>VvPHT1;1</i> expression. In leaves, <i>VvPHT1;1</i> was also upregulated by Si supply at flowering relative to the +P treatment, although its expression remained lower than in the –P vines. Enhanced exudation of citrate and malate under low-P conditions also promoted Si mobilisation in the rhizosheath soil and increased Si accumulation in leaves.</p> Conclusions <p>This study provides the first field-based evidence that Si fertilisation improves rhizosphere P mobilisation, root P uptake, and shoot P status in grafted grapevine.</p>

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Silicon enhances acquisition of phosphorus in grafted grapevines (cv. Chardonnay) grown under field conditions

  • 期刊论文

  • 发表日期：

    2026年2月18日

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  • Maja Trailovic,
  • Ljiljana Kostic Kravljanac,
  • Milos Stanojevic,
  • Jelena Pavlovic,
  • Predrag Bosnic,
  • Igor Kostic,
  • Miroslav Nikolic

摘要

Background and Aims

Interactions between silicon (Si) and phosphorus (P) in grapevine (Vitis vinifera) remain poorly understood. This study examined how Si fertilisation influences rhizosphere P availability by altering root malate and citrate exudation and P uptake in grafted grapevines grown under low-P soil conditions.

Methods

A field experiment was conducted in a vineyard with cv. Chardonnay grafted onto Kober 5BB rootstock, using rhizotrons that provided direct access to intact roots and their rhizosheath soil. Treatments included unfertilised control (–P, –Si), P fertilisation (+P), and Si fertilisation (+Si). Samples of rhizosheath soil, root exudates, and root/leaf tissues were taken at key growth stages (flowering, pea-sized berry, and veraison).

Results

Leaf P concentrations in +Si vines reached levels comparable to those in +P vines. Silicon fertilisation enhanced root exudation of citrate and malate relative to both the control and +P treatments, particularly at pea-sized berry stage. This was accompanied by enhanced expression of VvPEPC and VvALMT1. In roots, Si supply consistently upregulated VvPHT1;1, increasing transcript levels several-fold compared with the control across all growth stages, whereas P fertilisation downregulated VvPHT1;1 expression. In leaves, VvPHT1;1 was also upregulated by Si supply at flowering relative to the +P treatment, although its expression remained lower than in the –P vines. Enhanced exudation of citrate and malate under low-P conditions also promoted Si mobilisation in the rhizosheath soil and increased Si accumulation in leaves.

Conclusions

This study provides the first field-based evidence that Si fertilisation improves rhizosphere P mobilisation, root P uptake, and shoot P status in grafted grapevine.