Fluorescence parameters among leaf photosynthesis-related traits are the best proxies for CO2 assimilation in Central Amazon trees
We investigated whether photosynthesis along the vertical profile of tropical forest can be represented by JIP-test parameters derived from the fluorescence induction curve instead of more commonly utilized traits. Photosynthesis-related traits were measured during four seasons in 45 trees along a v...
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Published in | Revista brasileira de botânica Vol. 42; no. 2; pp. 239 - 247 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Cham
Springer International Publishing
30.06.2019
Springer Nature B.V Springer |
Subjects | |
Online Access | Get full text |
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Summary: | We investigated whether photosynthesis along the vertical profile of tropical forest can be represented by JIP-test parameters derived from the fluorescence induction curve instead of more commonly utilized traits. Photosynthesis-related traits were measured during four seasons in 45 trees along a vertical forest profile in the Central Amazon, and their combined (interspecific) correlations with canopy openness and
P
Nmax
(light-saturated photosynthesis) were examined.
P
Nmax
, canopy openness, the efficiency of electron transport in PSI (IP-phase and RE
0
/ET
0
), leaf mass per area and leaf phosphorus content had strong positive correlations (r > 0.6). JIP-test parameters related to the final steps of electron transport (IP-phase, RE
0
/ET
0
and PI
total
) were good predictors of
P
Nmax
during all seasons, whereas stomatal conductance had the strongest correlation with
P
Nmax
during the dry season. The JIP-test parameters related to PSII efficiency (PI
ABS
and
F
V
/
F
M
) were poorly associated with
P
Nmax
. Therefore, the
P
Nmax
variation along the vertical profile of Central Amazonian forest can be represented by JIP-test parameters, especially those related to the final steps of the electron transport chain. |
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Bibliography: | USDOE Office of Science (SC) SC0008383 |
ISSN: | 0100-8404 1806-9959 |
DOI: | 10.1007/s40415-019-00533-2 |