My Account: Log In | Join | Renew
Search
Author
Title
Vol.
Issue
Year
1st Page

Abstract

 

This article in AJ

  1. Vol. 62 No. 6, p. 699-701
     
    Received: Dec 20, 1969
    Published: Nov, 1970


 View
 Download
 Alerts
 Permissions
 Share

doi:10.2134/agronj1970.00021962006200060004x

Growth of Cotton Seedlings in Relation to Maximum Daily Plant-Water Potential1

  1. Wayne R. Jordan2

abstract

abstract

A pressure chamber technique was used to evaluate the relation between leaf-water potential (leaf ΨW) and growth of cotton (Gossypium hirsutum L.) seedlings under greenhouse conditions. A water potential gradient of about 5 bars developed from plant top to bottom by early afternoon, but disappeared after several hours of darkness. A diurnal change of about —12 bars occurred during one day of a drying cycle. Maximum leaf ΨW were reached just prior to sunrise. Growth processes depending largely on cell expansion for expression were affected at identical water deficits during the drying cycle. Increases in plant height, in leaf area, and in fresh weight were inhibited when potentials above —8 bars were not reached for a portion of each day. Predawn wilting was not observed until the eighth and final day of the stress period, corresponding to a leaf ΨW of —26 bars.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © .