Effects of light and temperature on isoprene emission at different leaf developmental stages of eschweilera coriacea in central Amazon

Acta Amazonica

Eliane Gomes Alves²  Peter Harley¹  José Francisco De C. Gonçalves¹  Carlos Eduardo Da Silva Moura¹  Kolby Jardine¹ 

[1] ,University of Amazon State National Institute for Amazon Research Climate and Environment DepartmentManaus Amazonas ,Brazil

关键词: light response curve;    temperature response curve;    leaf phenology;    tropical species;    curva de luz;    curva de temperatura;    fenologia foliar;    espécie tropical;   

DOI  :  10.1590/S0044-59672014000100002

来源: SciELO

【 摘 要 】

Isoprene emission from plants accounts for about one third of annual global volatile organic compound emissions. The largest source of isoprene for the global atmosphere is the Amazon Basin. This study aimed to identify and quantify the isoprene emission and photosynthesis at different levels of light intensity and leaf temperature, in three phenological phases (young mature leaf, old mature leaf and senescent leaf) of Eschweilera coriacea (Matamatá verdadeira), the species with the widest distribution in the central Amazon. In situ photosynthesis and isoprene emission measurements showed that young mature leaf had the highest rates at all light intensities and leaf temperatures. Additionally, it was observed that isoprene emission capacity (Es) changed considerably over different leaf ages. This suggests that aging leads to a reduction of both leaf photosynthetic activity and isoprene production and emission. The algorithm of Guenther et al. (1999) provided good fits to the data when incident light was varied, however differences among E S of all leaf ages influenced on quantic yield predicted by model. When leaf temperature was varied, algorithm prediction was not satisfactory for temperature higher than ~40 °C; this could be because our data did not show isoprene temperature optimum up to 45 °C. Our results are consistent with the hypothesis of the isoprene functional role in protecting plants from high temperatures and highlight the need to include leaf phenology effects in isoprene emission models.

【 授权许可】

CC BY   
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