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Two mutants of Arabidopsis thaliana that become chlorotic in atmospheres enriched with CO 2
Author(s) -
MSUDOE N. N. ARTUS
Publication year - 1990
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1990.tb01075.x
Subject(s) - mutant , photorespiration , chlorosis , arabidopsis thaliana , elongation , photosynthesis , botany , biophysics , biology , chemistry , horticulture , biochemistry , gene , materials science , ultimate tensile strength , metallurgy
. Two nonallelic, nuclear recessive mutants of Arabidopsis thaliana (L.) Heynh. which become chlorotic when grown in an atmosphere enriched to 20000 cm 3 CO 2 m ‐3 have been isolated. For one of the mutants, chlorosis begins at the veins and gradually spreads to the interveinal regions. A minimum photon flux density of ca 50 μmol m ‐2 s ‐1 is required for this response. For the other mutant, the yellowing is independent of the light intensity and begins at the basal regions of the leaves and spreads to the tips. The injurious effects of CO 2 seem to be restricted to photosynthetic tissues, since root elongation and callus growth were not inhibited by a high atmospheric CO 2 concentration for either mutant. Neither mutant became chlorotic in a low O 2 atmosphere that suppressed photorespiration as effectively as the elevated CO 2 does. Thus, the mutations do not impose a requirement for photorespiration. The possibilities that the high CO 2 ‐sensitive phenotypes are caused by an effect of CO 2 in stomata, on ethylene synthesis, or on mineral uptake are discussed but are considered unlikely.