Document


Title

Determination of soil drought resistance in grass seedlings
Document Type: Journal Article
Author(s): D. F. McAlister
Publication Year: 1944

Cataloging Information

Keyword(s):
  • Agropyron eristatum
  • Agropyron sibericum
  • Agropyron trachycaulum
  • Alopecurus pratensis
  • Arrhenatherum elatius
  • Bromus inermis
  • Dactylis glomerata
  • droughts
  • Elymus glaucus
  • Festuca elatior
  • grasses
  • grasslands
  • humidity
  • introduced species
  • light
  • perennial plants
  • plant growth
  • seedlings
  • soil moisture
  • temperature
  • wind
Topic(s):
Record Maintained By:
Record Last Modified: June 1, 2018
FRAMES Record Number: 26542
Tall Timbers Record Number: 263
TTRS Location Status: In-file
TTRS Call Number: Fire File
TTRS Abstract Status: Okay, Fair use, Reproduced by permission

This bibliographic record was either created or modified by the Tall Timbers Research Station and Land Conservancy and is provided without charge to promote research and education in Fire Ecology. The E.V. Komarek Fire Ecology Database is the intellectual property of the Tall Timbers Research Station and Land Conservancy.

Description

A direct method for determining soil drought resistance to supplement field tests is described. Grass seedlings are grown for 6 to 8 weeks in the greenhouse and then given a soil drought treatment lasting from 6 to 9 days by placing them in a chamber designed to maintain constant environmental conditions of temperature (80 degrees F), light (175 foot-candles), relative humidity (30 to 35%), and air velocity (0.5 mile per hour). Seedlings surviving the drought treatment are allowed to recover under favorable growing conditions in the greenhouse. The percentage of plants renewing growth during the recovery period is used as the index of relative drought resistance of a species or strain. In preliminary trials the reaction of over 96,000 grass seedlings to the controlled soil drought treatment has been studied. The average survival values for species have been in agreement with their known behavior under natural conditions of critical drought. More important, however, was the wide variation observed between strains or seed sources within species. Although field data are available for only a small number of the strains tested, satisfactory correlation between field and greenhouse survival was obtained where comparisons were possible. The variability of strains within species suggests the possibility of breeding for soil drought resistance in grasses and the dangers of characterizing a species as to drought resistance from observations on a single strain or seed source.

Citation:
McAlister, D. F. 1944. Determination of soil drought resistance in grass seedlings. Journal of the American Society of Agronomy, p. 324-335.