Work

A Physiological Basis for Different Patterns of Nitrate Accumulation in Cucumber and Pea1

Year: 1976

Type: article

Abstract: Cucumber ( Cucumis sativus L.) plants accumulate more than pea ( Pisum sativum L.) plants. The differences in accumulation appear to be due to differences in the abilities of the two species to reduce in their roots. Only 2% of the reductase activity of cucumber was found in its roots, whereas nearly 92% of the activity was found in the blades. In pea, reductase activity was more evenly distributed throughout the plant;67% of the activity was in the blades, 18% in the roots, and the remainder in the stems and petioles. Nitrate-N comprised 80% of the N present in bleeding sap of roots of cucumber plants from which the shoots had been excised. In contrast, NO 3 -N constituted only 30% of the N in the sap from pea roots, the remaining 70% of the N consisting of amino acids and amides. Asparagine or aspartic acid was the major carrier of reduced N in pea, and glutamine was the major carrier in cucumber. The differences in N transport and assimilation appear to bear considerably on plant composition and efficiency of N usage.

Source: Journal of the American Society for Horticultural Science

DOI: 10.21273/jashs.101.3.219

Authors: Frederick C. Olday, Allen V. Barker, Donald N. Maynard

Institution: University of Massachusetts Amherst

Language: English

Topic: Plant nutrient uptake and metabolism

Subfield: Plant Science

Field: Agricultural and Biological Sciences

Domain: Life Sciences

SDG: Zero hunger

Open Access status: hybrid

Estimated APC paid: $3,500