Sugarcane performance under phosphorus deficiency: physiological responses and genotypic variation

Autor(es)

Bachiega Zambrosi, Fernando C. ^[1] ; Ribeiro, Rafael Vasconcelos ^[2] ; Ribeiro Marchiori, Paulo E. ^[3] ; Cantarella, Heitor ^[1] ; Andrade Landell, Marcos G. ^[4]

Afiliação do(s) autor(es)

^[1] Inst Agron IAC, Ctr Solos & Recursos Ambientais, BR-13012970 Campinas, SP - Brazil

^[2] Univ Campinas UNICAMP, Inst Biol, Dept Plant Biol, BR-13083970 Campinas, SP - Brazil

^[3] Inst Agron IAC, Programa Posgrad Agr & Trop Subtrop, BR-13012970 Campinas, SP - Brazil

^[4] Inst Agron IAC, Ctr Avancado Pesquisa Tecnol Agronegocio Cana, BR-14001970 Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PLANT AND SOIL; v. 386, n. 1-2, p. 273-283, JAN 2015.
• Citações Web of Science: 8

Resumo

Developing genotypes with enhanced performance under phosphorus (P) deficiency can be described as an approach to improving production sustainability. This study investigated the physiological responses of sugarcane varieties to varying P availability and the plant traits contributing to P efficiency (shoot dry matter production under low P availability). Sugarcane varieties IACSP94-2101, IACSP95-5000, RB86-7515, IAC91-1099, IACSP94-2094 and IAC87-3396 were grown under low (25 mg P kg(-1) soil) and high (400 mg P kg(-1) soil) P supply, and the leaf gas exchange, photochemical activity, plant growth and P uptake were evaluated. The sugarcane varieties responded distinctly to a low P supply, as indicated by differences in root and shoot growth, leaf area, net CO2 assimilation, photosynthetic P utilization efficiency, leaf P concentration and P uptake. The following ranking was obtained for P efficiency: IACSP94-2094 = IACSP95-5000 > IAC87-3396 = RB86-7515 = IACSP94-2101 = IAC91-1099. Greater leaf area, net CO2 assimilation and P acquisition efficiency were combined in the more P-efficient varieties but not in the less efficient ones. Although it was not possible to separate cause and effect, such finding might be explained by the positive effect of improved leaf P concentration on leaf area and net CO2 assimilation, which in turn contributed to sustaining improved plant performance under a low P supply. (AU)

• Processo FAPESP: 11/18446-0 - Eficiência de uso de fósforo por variedades de cana-de-açúcar
• Beneficiário: Fernando César Bachiega Zambrosi
• Modalidade de apoio: Auxílio à Pesquisa - Regular