Uptake of labeled ¹⁴C bicarbonate by some monocot and dicot plants from nutrient solution

Abstract

Uptake of H¹⁴CO₃‐ was measured for 48‐hour exposure of some monocot (Oryza sativa, Triticale heraploid, Triticum aestivum, and Zea mays) and dicot (Glycine max and Lycopersicon esculentum) seedlings in nutrient solution, each with all NH₄ ⁺ vs. all NO₃ ^‐ solutions. On the dry‐weight basis, monocots had more ¹⁴C in shoots than did dicots. Shoot‐root ratios of ¹⁴C were higher for monocots than dicots. NH₄ ⁺‐N grown plants had more ¹⁴C than NO₃ ^‐‐N grown plants as expected, with wider shoot‐root ratios for dicots than monocots.

Key words:

• Lime‐induced chlorosis
• bicarbonate

Notes

The Laboratory of Biomedical and Environmental Sciences is operated for the U.S. Department of Energy by the University of California under Contract No. DE‐ACO3–76‐SF00012.