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14 C UPTAKE BY THE MARINE ANGIOSPERM PHYLLOSPADIX SCOULERP
Author(s) -
Barbour Michael G.,
Radosevich Steven R.
Publication year - 1979
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1979.tb06227.x
Subject(s) - biology , photosynthesis , rhizome , botany , intertidal zone , seawater , dry weight , carbon dioxide , horticulture , ecology
Rhizomes and attached leaves of Phyllospadix scouleri Hook, were collected in the intertidal zone along the central California coast and exposed to a solution of NaH 14 CO 3 in seawater under controlled laboratory conditions. Over a 90‐min period roots and rhizomes absorbed very little 14 C compared to leaves. Translocation during that time was minor. Plants pretreated with the photosynthetic inhibitor DCMU showed no 14 C uptake, indicating that under normal circumstances the carbon which is absorbed by leaves is fixed and accumulates as photosynthate. The rate of gross photosynthesis was about 13 mg CO 2 g dry wt −1 hr −1 . Gross photosynthesis of wet leaves exposed to 14 CO 2 in air was significantly less than leaves exposed to NaH 14 CO 3 . The effect of a leaf‐grazing limpet ( Notoacmea paleacea) on leaf anatomy and 14 C uptake is discussed.