Leaf gas exchange of 20 palm species under field conditions

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

WILLIS L.E.; MARLER T.E. HUBBUCH C. 1998. Leaf gas exchange of 20 palm species under field conditions. 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 carbon dioxide assimilation (A) and stomatal conductance to water (g subscript s) was measured on leaves of Sabal causiarum on a representative mostly sunny day for the season. Pinnae A and g subscript s rapidly increased following sunrise to a maximum by 0900 h followed by a slow decline throughout the day. Moderate recovery of A occured during late afternoon but g subscript s did not follow this pattern. Dark respiration of S. causiarum was 5.3 per cent of maximum A. Based on these data measurements on the 20 species were made during the morning hours when gas exchange was maximal. Net carbon dioxide assimilation ranged from 5.5 micron mol m superscript minus 2 s superscript minus 1 for Ravenea rivularis to 16.9 micron mol m superscript minus 2 s superscript minus 1 for Bismarckia nobilis. The range of g subscript s was was 121 mmol m superscript minus 2 s superscript minus 1 for Phytelephas macrocarpa to 582 mmol m superscript minus 2 s superscript s minus 1 for B. nobilis. Mean transpiration (E) ranged from 1.9 to 6.2 mmol m superscript minus 2 s superscript minus 1. Values of A g subscript 8 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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Abstract

WILLIS L.E.; MARLER T.E. HUBBUCH C. 1998. Leaf gas exchange of 20 palm species under field conditions. 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 carbon dioxide assimilation (A) and stomatal conductance to water (g subscript s) was measured on leaves of Sabal causiarum on a representative mostly sunny day for the season. Pinnae A and g subscript s rapidly increased following sunrise to a maximum by 0900 h followed by a slow decline throughout the day. Moderate recovery of A occured during late afternoon but g subscript s did not follow this pattern. Dark respiration of S. causiarum was 5.3 per cent of maximum A. Based on these data measurements on the 20 species were made during the morning hours when gas exchange was maximal. Net carbon dioxide assimilation ranged from 5.5 micron mol m superscript minus 2 s superscript minus 1 for Ravenea rivularis to 16.9 micron mol m superscript minus 2 s superscript minus 1 for Bismarckia nobilis. The range of g subscript s was was 121 mmol m superscript minus 2 s superscript minus 1 for Phytelephas macrocarpa to 582 mmol m superscript minus 2 s superscript s minus 1 for B. nobilis. Mean transpiration (E) ranged from 1.9 to 6.2 mmol m superscript minus 2 s superscript minus 1. Values of A g subscript 8 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
Additional Information:	Summaries (En Ms)
AGROVOC Term:	PALMAE
AGROVOC Term:	LEAVES
AGROVOC Term:	GAS EXCHANGE
AGROVOC Term:	FIELDS
AGROVOC Term:	PHOTOSYNTHESIS
AGROVOC Term:	STOMATA
AGROVOC Term:	FLORIDA PALMAE
AGROVOC Term:	HOJAS
AGROVOC Term:	INTERCAMBIO DE GASES
AGROVOC Term:	CAMPO
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:52
URI:	http://webagris.upm.edu.my/id/eprint/17760

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