INTERACTION OF MOLYBDENUM AND PHOSPHORUS SUPPLY ON UPTAKE AND TRANSLOCATION OF PHOSPHORUS AND MOLYBDENUM BY BRASSICA NAPUS

Abstract

A hydroponic trial was conducted to assess interaction of molybdenum (Mo) and phosphorus (P) on uptake and translocation of P and Mo by Brassica napus. Molybdenum was applied at four rates (0, 0.01, 0.1 and 1 mg L⁻¹) and P at three rates (1, 30, and 90 mg L⁻¹) in nutrient solution. The results indicated that P increased shoot growth and 0.01 mg L⁻¹ Mo improved the growth of shoots and roots. Molybdenum increased shoot P uptake and root P concentration and uptake when higher P was provided, and had a stimulating effect on P translocation from shoots to roots. P increased shoot Mo concentration and uptake, decreased those in roots, and enhanced Mo transport from roots to shoots. These results implied that both Mo and P had beneficial effects on Mo and P absorption and translocation and co-application of them were necessary to promote growth and utilization of Mo and P for Brassica napus.

Keywords:

• interaction
• molybdenum
• phosphorus
• uptake
• translocation
• Brassica napus

ACKNOWLEDGMENT

This research is financially supported by the Program for New Century Excellent Talents of Education Ministry of China (No.NCET-04-0731).

Notes

*significant at P < 0.05;

**significant at P < 0.01.