Impact of increasing mean air temperature on the development of rice and red rice

Pesquisa Agropecuária Brasileira

Isabel Lago¹  Nereu Augusto Streck¹  Cleber Maus Alberto¹  Felipe Brendler Oliveira¹  Gizelli Moiano De Paula¹ 

[1] ,Universidade Federal de Santa Maria Centro de Ciências Rurais Departamento de FitotecniaSanta Maria RS ,Brazil

关键词: Oryza sativa;    global warming;    phenology;    simulation;    weeds;    Oryza sativa;    aquecimento global;    fenologia;    simulação;    planta daninha;   

DOI  :  10.1590/S0100-204X2008001100001

来源: SciELO

【 摘 要 】

The objective of this study was to assess the development response of cultivated rice and red rice to different increases in minimum and maximum daily air temperatures, in Santa Maria, Rio Grande do Sul State, Brazil. One hundred years climate scenarios of temperatures 0, +1, +2, +3, +4, and +5ºC, with symmetric and asymmetric increases in minimum and maximum daily air temperatures were created, using the LARS-WG Weather Generator, and a 1969-2003 database. Nine cultivated rice genotypes (IRGA 421, IRGA 416, IRGA 417, IRGA 420, BRS 7 TAIM, BR-IRGA 409, EPAGRI 109, EEA 406 and a hybrid), and two red rice biotypes (awned black hull-ABHRR, and awned yellow hull-AYHRR) were used. The dates of panicle differentiation (R1), anthesis (R4), and all grains with brown hulls (R9) were estimated with a nonlinear simulation model. Overall, the duration of the emergence-R1 phase decreased, whereas the duration of the R1-R4 and R4-R9 phases most often increased, as temperature increased in the climate change scenarios. The simulated rice development response to elevated temperature was not the same, when the increase in minimum and maximum temperature was symmetric or asymmetric.

【 授权许可】

CC BY   
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