Premium
Gas exchange and carbon isotope composition of Ananas comosus in response to elevated CO 2 and temperature
Author(s) -
Wanxue Zhu,
D. Yitzchak Goldstein,
Bartholomew
Publication year - 1999
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1046/j.1365-3040.1999.00451.x
Subject(s) - ananas , carbon dioxide , photosynthesis , chemistry , phosphoenolpyruvate carboxylase , zoology , crassulacean acid metabolism , bromeliaceae , botany , horticulture , environmental chemistry , biology , biochemistry , organic chemistry
Ananas comosus L. (Merr.) (pineapple) was grown at three day/night temperatures and 350 (ambient) and 700 (elevated) μ mol mol –1 CO 2 to examine the interactive effects of these factors on leaf gas exchange and stable carbon isotope discrimination ( Δ ,‰). All data were collected on the youngest mature leaf for 24 h every 6 weeks. CO 2 uptake (mmol m –2 d –1 ) at ambient and elevated CO 2 , respectively, were 306 and 352 at 30/20 °C, 175 and 346 at 30/25 °C and 187 and 343 at 35/25 °C. CO 2 enrichment enhanced CO 2 uptake substantially in the day in all environments. Uptake at night at elevated CO 2 , relative to that at ambient CO 2 , was unchanged at 30/20 °C, but was 80% higher at 30/25 °C and 44% higher at 35/25 °C suggesting that phosphoenolpyruvate carboxylase was not CO 2 ‐saturated at ambient CO 2 levels and a 25 °C night temperature. Photosynthetic water use efficiency (WUE) was higher at elevated than at ambient CO 2 . Leaf Δ ‐values were higher at elevated than at ambient CO 2 due to relatively higher assimilation in the light. Leaf Δ was significantly and linearly related to the fraction of total CO 2 assimilated at night. The data suggest that a simultaneous increase in CO 2 level and temperature associated with global warming would enhance carbon assimilation, increase WUE, and reduce the temperature dependence of CO 2 uptake by A. comosus .