NDLI: Photosynthetic responses to dynamic light under field conditions in six tropical rainforest shrubs occuring along a light gradient

Content Provider	Springer Nature Link
Author	Valladares, F. Allen, Mitchell T. Pearcy, Robert W.
Copyright Year	1997
Abstract	We examined in the field the photosynthetic utilization of fluctuating light by six neotropical rainforest shrubs of the family Rubiaceae. They were growing in three different light environments: forest understory, small gaps, and clearings. Gas exchange techniques were used to analyse photosynthetic induction response, induction maintenance during low-light periods, and lightfleck (simulated sunfleck) use efficiency (LUE). Total daily photon flux density (PFD) reaching the plants during the wet season was 37 times higher in clearings than in the understory, with small gaps exhibiting intermediate values. Sunflecks were more frequent, but shorter and of lower intensity in the understory than in clearings. However, sunflecks contributed one-third of the daily PFD in the understory. Maximum rates of net photosynthesis, carboxylation capacity, electron transport, and maximum stomatal conductance were lower in understory species than in species growing in small gaps or clearings, while the reverse was true for the curvature factor of the light response of photosynthesis. No significant differences were found in the apparent quantum yield. The rise of net photosynthesis during induction after transfer from low to high light varied from a hyperbolic shape to a sigmoidal increase. Rates of photosynthetic induction exhibited a negative exponential relationship with stomatal conductance in the shade prior to the increase in PFD. Leaves of understory species showed the most rapid induction and remained induced longer once transferred to the shade than did leaves of medium- or high-light species. LUE decreased rapidly with increasing lightfleck duration and was affected by the induction state of the leaf. Fully induced leaves exhibited LUEs up to 300% for 1-s lightflecks, while LUE was below 100% for 1–80 s lightflecks in uninduced leaves. Both induced and uninduced leaves of understory species exhibited higher LUE than those of species growing in small gaps or clearings. However, most differences disappeared for lightflecks 10 s long or longer. Thus, understory species, which grew in a highly dynamic light environment, had better capacities for utilization of rapidly fluctuating light than species from habitats with higher light availability.
Starting Page	505
Ending Page	514
Page Count	10
File Format	PDF
ISSN	00298549
Journal	Oecologia
Volume Number	111
Issue Number	4
e-ISSN	14321939
Language	English
Publisher	Springer-Verlag
Publisher Date	1997-08-08
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Photosynthetic responses to dynamic light under field conditions in six tropical rainforest shrubs occuring along a light gradient

Stomatal versus biochemical limitations to dynamic photosynthetic performance in four tropical rainforest shrub species

Stomatal behavior and photosynthetic performance under dynamic light regimes in a seasonally dry tropical rain forest

Comparison of temperate and tropical rainforest tree species: photosynthetic responses to growth temperature

Beetle assemblages in rainforest gaps along a subtropical to tropical latitudinal gradient

Do differences in understory light contribute to species distributions along a tropical rainfall gradient?

Adaptive radiation of photosynthetic physiology in the Hawaiian lobeliads: dynamic photosynthetic responses

Photosynthetic responses to vapour pressure deficit in temperate and tropical evergreen rainforest trees of Australia

Photosynthetic responses of tree seedlings in grass and under shrubs in early-successional tropical old fields, Costa Rica

Photosynthetic responses to dynamic light under field conditions in six tropical rainforest shrubs occuring along a light gradient

Similar Documents

Photosynthetic responses to dynamic light under field conditions in six tropical rainforest shrubs occuring along a light gradient

Stomatal versus biochemical limitations to dynamic photosynthetic performance in four tropical rainforest shrub species

Stomatal behavior and photosynthetic performance under dynamic light regimes in a seasonally dry tropical rain forest

Comparison of temperate and tropical rainforest tree species: photosynthetic responses to growth temperature

Beetle assemblages in rainforest gaps along a subtropical to tropical latitudinal gradient

Do differences in understory light contribute to species distributions along a tropical rainfall gradient?

Adaptive radiation of photosynthetic physiology in the Hawaiian lobeliads: dynamic photosynthetic responses

Photosynthetic responses to vapour pressure deficit in temperate and tropical evergreen rainforest trees of Australia

Photosynthetic responses of tree seedlings in grass and under shrubs in early-successional tropical old fields, Costa Rica

Photosynthetic responses to dynamic light under field conditions in six tropical rainforest shrubs occuring along a light gradient