Fluorescence parameters among leaf photosynthesis-related traits are the best proxies for CO2 assimilation in Central Amazon trees

• Published in: Revista brasileira de botânica Vol. 42; no. 2; pp. 239 - 247
• Main Authors: dos Santos, Victor Alexandre Hardt Ferreira, Nelson, Bruce Walker, Rodrigues, João Victor Figueiredo Cardoso, Garcia, Maquelle Neves, Ceron, João Vitor Barbosa, Ferreira, Marciel José
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 30.06.2019; Springer Nature B.V; Springer
• Subjects: Biological assimilation; Biomedical and Life Sciences; Botany; Canopies; Carbon dioxide; Conductance; Correlation; Dry season; Electron transport; Electron transport chain; Fluorescence; Interspecific; Leaves; Life Sciences; Original Article; Parameters; Phosphorus; Photosynthesis; Photosystem II; Plant Sciences; Plant Systematics/Taxonomy/Biogeography; Resistance; Stomata; Stomatal conductance; Trees; Tropical forests; Photosystem I; Chlorophyll; Tropical forest; Photosynthesis; fluorescence; JIP-test
• ISSN: 0100-8404; 1806-9959
• DOI: 10.1007/s40415-019-00533-2

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.