Water Stress Permanently Alters Shoot Architecture in Common Bean Plants

Autor(es)

Durigon, Angelica ^[1] ; Evers, Jochem ^[2] ; Metselaar, Klaas ^[3] ; van Lier, Quirijn de Jong ^[4]

Afiliação do(s) autor(es)

^[1] Univ Fed Santa Maria, Crop Sci Dept, Agr Meteorol Grp, Av Roraima 1000, BR-97105900 Santa Maria, RS - Brazil

^[2] Wageningen Univ & Res Ctr, Ctr Crop Syst Anal, POB 430, NL-6700 AK Wageningen - Netherlands

^[3] Wageningen Univ & Res Ctr, Soil Phys & Land Management Grp, POB 47, NL-6700 AA Wageningen - Netherlands

^[4] Univ Sao Paulo, Ctr Nucl Energy Agr, Soil Phys Lab, POB 96, BR-13405900 Piracicaba - Brazil

• Tipo de documento: Artigo Científico
• Fonte: AGRONOMY-BASEL; v. 9, n. 3 MAR 26 2019.
• Citações Web of Science: 1

Resumo

The effects of water stress on crop yield through modifications of plant architecture are vital to crop performance such as common bean plants. To assess the extent of this effect, an outdoor experiment was conducted in which common bean plants received five treatments: fully irrigated, and irrigation deficits of 30% and 50% applied in flowering or pod formation stages onwards. Evapotranspiration, number and length of pods, shoot biomass, grain yield and harvest index were assessed, and architectural traits (length and thickness of internodes, length of petioles and petiolules, length and width of leaflet blades and angles) were recorded and analyzed using regression models. The highest irrigation deficit in the flowering stage had the most pronounced effect on plant architecture. Stressed plants were shorter, leaves were smaller and pointing downward, indicating that plants permanently altered their exposure to sunlight. The combined effect of irrigation deficit and less exposure to light lead to shorter pods, less shoot biomass and lower grain yield. Fitted empirical models between water deficit and plant architecture can be included in architectural simulation models to quantify plant light interception under water stress, which, in turn, can supply crop models adding a second order of water stress effects on crop yield simulation. (AU)

• Processo FAPESP: 12/09316-8 - Parametrizações físicas de um modelo para a estimativa da taxa de transpiração de plantas
• Beneficiário: Angelica Durigon
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/19374-8 - Acoplamento de um modelo físico para a estimativa da transpiração de plantas a um modelo funcional-estrutural de plantas
• Beneficiário: Angelica Durigon
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado