Maize leaf development under climate change scenarios

Pesquisa Agropecuária Brasileira

Nereu Augusto Streck¹  Josana Andréia Langner¹  Isabel Lago¹ 

[1] ,Universidade Federal de Santa Maria Departamento de Fitotecnia Santa Maria RS

关键词: Zea mays;    elevated temperature;    frost risk;    global warming;    leaf appearance;    vegetative development;    Zea mays;    temperaturas elevadas;    risco de geada;    aquecimento global;    aparecimento de folhas;    desenvolvimento vegetativo;   

DOI  :  10.1590/S0100-204X2010001100001

来源: SciELO

【 摘 要 】

The objective of this work was to simulate maize leaf development in climate change scenarios at Santa Maria, RS, Brazil, considering symmetric and asymmetric increases in air temperature. The model of Wang & Engel for leaf appearance rate (LAR), with genotype-specific coefficients for the maize variety BRS Missões, was used to simulate tip and expanded leaf accumulated number from emergence to flag leaf appearance and expansion, for nine emergence dates from August 15 to April 15. LAR model was run for each emergence date in 100-year climate scenarios: current climate, and +1, +2, +3, +4 and +5°C increase in mean air temperature, with symmetric and asymmetric increase in daily minimum and maximum air temperature. Maize crop failure due to frost decreased in elevated temperature scenarios, in the very early and very late emergence dates, indicating a lengthening in the maize growing season in warmer climates. The leaf development period in maize was shorter in elevated temperature scenarios, with greater shortening in asymmetric temperature increases, indicating that warmer nights accelerate vegetative development in maize.

【 授权许可】

CC BY   
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