Wheat cultivar tolerance to boron deficiency and toxicity in nutrient solution

Scientia Agricola

Ângela Maria Cangiani Furlani²  Cristiane Pierrotte Carvalho²  José Guilherme De Freitas¹  Marcelo Fontanetti Verdial¹ 

[1] ,IAC Centro de Pesquisa e Desenvolvimento de Solos e Recursos Ambientais Campinas SP ,Brasil

关键词: Triticum aestivum L.;    boron nutrition;    leaf B concentrations;    critical limits;    Triticum aestivum;    cultivares de trigo;    nutrição com B;    teores de B nas folhas;    limites críticos;   

DOI  :  10.1590/S0103-90162003000200022

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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