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Photosynthetic characteristics and water use efficiency of three coastal dune plants
Author(s) -
Ishikawa Shinichi,
Oikawa Takehisa,
Furukawa Akio
Publication year - 1990
Publication title -
ecological research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.628
H-Index - 68
eISSN - 1440-1703
pISSN - 0912-3814
DOI - 10.1007/bf02347012
Subject(s) - transpiration , water use efficiency , perennial plant , photosynthesis , stomatal conductance , botany , horticulture , biology , chemistry
To clarify the ecophysiological characteristics of plants growing on a coastal dune, net photosynthetic rate ( Pn ) and leaf conductance ( g1 ) of three perennial species in Japanese coastal regions, Ischaemum anthephoroides (C 4 ), Carex kobomugi (C 3 ) and Calystegia soldanella (C 3 ), were compared under controlled environmental conditions and field conditions at the kado‐ori coast at Ohno Village, Ibaraki. I. anthephoroides achieved photosynthetic CO 2 saturation at ca. 100 μll −1 intercellular CO 2 concentration ( C 1 ), and its Pn was not light‐saturated at a high photosynthetically active photon flux density (PPFD) of 1000 μmol m −2 s −1 . This C 4 species showed a high optimal leaf temperature for Pn (35°C) and a low g1 (0.1 mol H 2 O m −2 s −1 ), permitting maintenance of the highest water use efficiency ( WUE , the ratio of Pn to transpiration rate ( Tr) ) in the field among the three species. At light saturation, C. soldanella had the lowest Pn and g1 and a similar carboxylation efficiency related to C 1 (Pn/C 1 ratio) as Carex kobomugi. Calystegia soldanella also had a high optimal temperature for Pn (30°C), and achieved higher WUE than Carex kobomugi , as a result of efficient stomatal regulation. In contrast, at the optimum temperature C. kobomugi had a high Pn comparable to I. anthephoroides due to a high g1 of 0.3 mol H 2 O m −2 s −1 , but with high temperature treatments Pn and g1 were significantly decreased. C. kobomugi always had the lowest WUE among the three species in the field. It is therefore clear that I. anthephoroides is a heat‐resistant species, Calystegia soldanella is a heat‐enduring species and Carex kobomugi is a heat‐evading species due to its eraly phenology.