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Responses to elevated CO 2 of Flaveria linearis plants having a reduced activity of cytosolic fructose‐1,6‐bisphosphatase
Author(s) -
MICALLEF B. J.,
VANDERVEER P. J.,
SHARKEY T. D.
Publication year - 1996
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.1365-3040.1996.tb00221.x
Subject(s) - photosynthesis , acclimatization , sucrose , fructose , c4 photosynthesis , photosynthetic capacity , botany , horticulture , chemistry , biology , biochemistry
Wide variation exists in the growth responses of C 3 plants to elevated CO 2 levels. To investigate the role of photosynthetic feedback in this phenomenon, photosynthetic parameters and growth were measured for lines of Flaveria linearis with low, intermediate or high cytosolic fructose‐1,6‐bisphosphatase (cytFBPase) activity when grown at either 35 or 65 Pa CO 2 . The effects of pot size on the responses of these lines to elevated CO 2 were also examined. Photosynthesis and growth of plants with low cytFBPase activity were less responsive to elevated CO 2 , and these plants had a reduced maximum potential for photosynthesis and growth. Plants with intermediate cytFBPase activity also showed a lower relative growth enhancement when grown at 65 Pa CO 2 . There was a significant pot size effect on photosynthesis and growth for line 85‐1 (high cytFBPase). This effect was greatest for line 85‐1 when grown at 35 Pa CO 2 , since these plants showed the greatest downward acclimation of photosynthesis when grown in small pots. There was a minimal pot size effect for line 84‐9 (low cytFBPase), and this could be partly attributed to the reduced CO 2 sensitivity of this line. It is proposed that the capacity for sucrose synthesis in C 3 , plants is partly responsible for their wide variation in CO 2 responsiveness.