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This article in AJ

  1. Vol. 67 No. 4, p. 530-532
     
    Received: May 28, 1974
    Published: July, 1975


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doi:10.2134/agronj1975.00021962006700040019x

Combined Effects of Low Oxygen and Salinity on Germination of a Semi-dwarf Mexican Wheat1

  1. Everardo Aceves-N,
  2. L. H. Stolzy and
  3. G. R. Mehuys2

Abstract

Abstract

The simultaneous occurrence of low oxygen and high salinity conditions is common in a wide range of irrigated soils. The combined effects of O2 and osmotic potential stresses on germination of wheat (Triticum aestivum L. ‘Inia 66’) were tested under growth chamber conditions. A range of O2 concentrations and salinity levels were chosen to simulate soil aeration and salinity combinations that might be expected to occur in well-aerated, fine-textured, saline, and sallne.sodic soils. Daily observations of number of seeds germinated and days to first germination were recorded. Analysis of variance of percent germination was performed in three different ways: i) using the original data, ii) using the arcsine transformation, and iii) deleting most of the 0% germination values to get better estimates of the error terms.

Inia 66 showed tolerance to high salinity and low O2 during germination. Close to full germination occurred at a salinity level of −6 bars (21% 02) and at O2 (no salinity stress). However, the combination of high salinity with low O2 depressed germination below economic levels. Predicted osmotic potentials associated with a 50% decrease in germination ranged from −10.8 bars at 21% O2 to −3 bars at 1% O2. High salinity levels were more limiting than low O2 concentrations. Days to first germination were increased only at O2 concentrations lower than 5%. Apparently this concentration is the threshold at which germination is delayed at all the osmotic potentials tested. A function is proposed for predicting days to first germination under saline but good soil aeration conditions.

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