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Differential Stomatal Response Between C 3 and C 4 Species to Atmospheric CO 2 Concentration and Light 1
Author(s) -
Akita Shigemi,
Moss Dale N.
Publication year - 1972
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1972.0011183x001200060022x
Subject(s) - biology , setaria viridis , botany , transpiration , hordeum vulgare , light intensity , foxtail , setaria , photosynthesis , poaceae , weed , physics , optics
Transpiration measurements were made on attached leaves of potted plants or on excised leaves of native plants of three C 3 species—wheat ( Triticum aestivum L.), barley ( Hordeum vulgare L.), and dandelion ( Taraxacum officinale L.) — and three C 4 species — maize ( Zea mays L.), green foxtail ( Setaria viridis L.), and pigweed ( Amarranthus retroflexus L.) — in different CO 2 concentrations and light intensities. The experiments were begun with leaves in CO 2 ‐free air in light (0.4 cal cm −2 min −1 , 400–700 nm) to open the stomata. Stomata of C 3 species were less prone to closure than were stomata of C 4 species as the light intensity was decreased or as the CO 2 concentration was increased. The greater water use efficiency of C 4 species may be due in part to the better control of water loss because the stomata are more responsive to environmental changes than are the stomata of C 3 species.