Wheat cultivar tolerance to boron deficiency and toxicity in nutrient solution

Authors

  • Ângela Maria Cangiani Furlani IAC; Centro de Pesquisa e Desenvolvimento de Solos e Recursos Ambientais
  • Cristiane Pierrotte Carvalho IAC; Centro de Pesquisa e Desenvolvimento de Solos e Recursos Ambientais
  • José Guilherme de Freitas IAC; Centro de Análise e Pesquisa Tecnológica do Agronegócio de Grãos e Fibras
  • Marcelo Fontanetti Verdial USP; Escola Superior de Agricultura Luiz de Queiroz; Depto. de Produção Vegetal

DOI:

https://doi.org/10.1590/S0103-90162003000200022

Keywords:

Triticum aestivum L., boron nutrition, leaf B concentrations, critical limits

Abstract

Field symptoms of open spikelets in wheat were observed in specific cultivars and supposedly related to low B soils and differential B requirement among cultivars. This study aimed to evaluate the response of four wheat (Triticum aestivum L.) cultivars, IAC 24, IAC 60, IAC 287 and IAC 289, to increasing B concentrations in nutrient solution. The experiment was set up in a randomized complete block design, with four replicates and five B concentrations (0.0, 0.05, 0.2, 0.8 and 2.0 mg L-1), during 1997/1998, in a greenhouse. Plants were grown to maturity and evaluated for plant height, spike number and length, open spikelet number, grains per spike, plant parts dry matter, B, P, K, Ca and Mg leaf concentrations and total nutrient contents. The visual symptoms of B deficiency consisted of open spikelets, distorted spikes without grains. 'IAC 60' and 'IAC 287' had higher B efficiency, with the highest grain yields in lower B concentrations. The 'IAC 287' and 'IAC 24' were more tolerant to the highest B concentrations. 'IAC 24' required more B for grain production as compared to the other cultivars. The critical leaf B concentration for deficiency was 25 mg kg-1 of dry matter tissue for all cultivars, and for toxicity were: 44 to 45 mg kg-1 for 'IAC 60' and 'IAC 289'; 228 and 318 mg kg-1 for 'IAC 24' and 'IAC 287', respectively. Except for the highest B level in the nutrient solution, the leaf P, K, Ca and Mg concentrations and whole plant contents were in an adequate range in the plants and did not vary among cultivars.

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Published

2003-01-01

Issue

Section

Soils and Plant Nutrition

How to Cite

Wheat cultivar tolerance to boron deficiency and toxicity in nutrient solution . (2003). Scientia Agricola, 60(2), 359-370. https://doi.org/10.1590/S0103-90162003000200022