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An Analysis of Conditions Determining Decline in Water Potential and Concurrent Proline Accumulation in Leaves of Four Cultivars of Vicia faba L.

An Analysis of Conditions Determining Decline in Water Potential and Concurrent Proline... Field bean plants, Vicia faba L., in the field were used to study which conditions determine decline in leaf water potential (ΨW) and coinciding proline accumulation. Cultivars Minica and Optica, having a short period of elongation growth, were used and the cultivars Alfred and Kristall, with a long elongation growth period. The plants were exposed to a “dry” and a “moist” treatment in a randomized block design. Leaf ΨW proline concentration and rate of elongation growth were measured weekly in June and July of both years. The measurements and samplings were conducted from 6 a.m. to 6 p.m. at 4‐hour intervals. Some leaf samples were selected for amino acid analysis. It was concluded that a drought‐induced proline accumulation only occurred when the plants were still in the phase of elongation growth. In this phase, a pre‐dawn leaf ΨW lower than ‐2 bars, combined with high temperatures during the night, were the main determinants for this accumulation. Weather conditions in day time were less decisive for proline accumulation at a certain leaf ΨW decline. The same applies to the diurnal rhythm in physiological patterns, the genetic properties of the plants, the rate of leaf ΨW decline and the amino acid metabolism. Proline accumulation increased when two or more determinants acted together. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Agronomy and Crop Science Wiley

An Analysis of Conditions Determining Decline in Water Potential and Concurrent Proline Accumulation in Leaves of Four Cultivars of Vicia faba L.

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References (31)

Publisher
Wiley
Copyright
Copyright © 1987 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0931-2250
eISSN
1439-037X
DOI
10.1111/j.1439-037X.1987.tb00278.x
Publisher site
See Article on Publisher Site

Abstract

Field bean plants, Vicia faba L., in the field were used to study which conditions determine decline in leaf water potential (ΨW) and coinciding proline accumulation. Cultivars Minica and Optica, having a short period of elongation growth, were used and the cultivars Alfred and Kristall, with a long elongation growth period. The plants were exposed to a “dry” and a “moist” treatment in a randomized block design. Leaf ΨW proline concentration and rate of elongation growth were measured weekly in June and July of both years. The measurements and samplings were conducted from 6 a.m. to 6 p.m. at 4‐hour intervals. Some leaf samples were selected for amino acid analysis. It was concluded that a drought‐induced proline accumulation only occurred when the plants were still in the phase of elongation growth. In this phase, a pre‐dawn leaf ΨW lower than ‐2 bars, combined with high temperatures during the night, were the main determinants for this accumulation. Weather conditions in day time were less decisive for proline accumulation at a certain leaf ΨW decline. The same applies to the diurnal rhythm in physiological patterns, the genetic properties of the plants, the rate of leaf ΨW decline and the amino acid metabolism. Proline accumulation increased when two or more determinants acted together.

Journal

Journal of Agronomy and Crop Science – Wiley

Published: Jun 1, 1987

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