Leaf gas exchange of 20 palm species under field conditions

Willis Leah E., . and Marler Thomas E., . and Hubbuch Charles, . Leaf gas exchange of 20 palm species under field conditions. pp. 346-356. ISSN 0128-1283

Leaf gas exchange variables of 20 palm species were determined under field conditions in Miami Florida during June 1994 in order to establish a comparison among the six palm subfamilies. Diurnal variation in net CO2 assimilation (A) and stomatal conductance to H2O (gs) was measured on leaves of Sabal causiarum on a representative mostly sunny day for the season. Pinnae A and gs rapidly increased following sunrise to a maximum by 0900 h followed by a slow decline throughout the day. Moderate recovery of A occurred during late afternoon but gs did not follow this pattern. Dark respiration of 5. causiarum was 5.3 of maximum A. Based on these data measurements on the 20 species were made during the morning hours when gas exchange was maximal. Net CO2 assimilation ranged from 5.5umol rrrV1 for Ravenea rivularis to 16.9 umol irrs1 for Bismarckia nobilis. The range of gs was 121 mmol m2 s for Phytelephas macrocarpato 582 mmol nrs1 forfi. nobilis. Mean transpiration (E) ranged from 1.9 to 6.2 mmol ms1 . Values of A g and E were lowest for Calamoidae and Phytelephantoidae species lowest to mid-range for Arecoidae and Ceroxyloidae species mid-range for the only Nypoidae species and mid-range to highest for the Coryphoidae species. Values for gas exchange variables of these palm species were within the range to be expected for evergreen woody plants.

Full text available from: Official URL: http://www.frim.gov.my/v1/JTFSOnline/jtfs/v10n3/34...

Abstract

Leaf gas exchange variables of 20 palm species were determined under field conditions in Miami Florida during June 1994 in order to establish a comparison among the six palm subfamilies. Diurnal variation in net CO2 assimilation (A) and stomatal conductance to H2O (gs) was measured on leaves of Sabal causiarum on a representative mostly sunny day for the season. Pinnae A and gs rapidly increased following sunrise to a maximum by 0900 h followed by a slow decline throughout the day. Moderate recovery of A occurred during late afternoon but gs did not follow this pattern. Dark respiration of 5. causiarum was 5.3 of maximum A. Based on these data measurements on the 20 species were made during the morning hours when gas exchange was maximal. Net CO2 assimilation ranged from 5.5umol rrrV1 for Ravenea rivularis to 16.9 umol irrs1 for Bismarckia nobilis. The range of gs was 121 mmol m2 s for Phytelephas macrocarpato 582 mmol nrs1 forfi. nobilis. Mean transpiration (E) ranged from 1.9 to 6.2 mmol ms1 . Values of A g and E were lowest for Calamoidae and Phytelephantoidae species lowest to mid-range for Arecoidae and Ceroxyloidae species mid-range for the only Nypoidae species and mid-range to highest for the Coryphoidae species. Values for gas exchange variables of these palm species were within the range to be expected for evergreen woody plants.

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Item Type:	Article
AGROVOC Term:	Palmae
AGROVOC Term:	Species
AGROVOC Term:	Gas exchange
AGROVOC Term:	Leaves
AGROVOC Term:	Transpiration
AGROVOC Term:	Photosynthesis
AGROVOC Term:	Water use efficiency
AGROVOC Term:	Respiration
AGROVOC Term:	Field experiments
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:27
URI:	http://webagris.upm.edu.my/id/eprint/22556

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