ISSN:
1573-5036
Keywords:
barley
;
germination
;
response functions
;
salt tolerance
;
screening
;
threshold salinity
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract Two models, initially proposed by Van Genuchten (1983) for evaluating salinity-yield response curves at the adult stage, were applied to study the salinity response of 24 barley cultivars at the germination stage. According to the calculated salinity threshold, ECt (the solution electrical conductivity, EC, at which germination starts to decrease), and EC50 (the solution EC at which germination is reduced by 50%) parameters, both models give similar results, although model 2, a sigmoid-form curve, fits the observed data slightly better than model 1, a piecewise response function. Also, the results suggest that, for model 1, ECt seems to be the most reliable parameter for screening barley germplasm because it clearly discriminates the relative salt-tolerance of the studied cultivars and, furthermore, it basically determines their salinity response for the 100 to 50% germination interval. On the other hand, the model 1 s parameter — percent germination decrease per unit salinity increase bove ECt—is less relevant because of its smaller variation interval and lack of correlation with EC50, indicating that the salinity response of the studied cultivars for the 50% germination value is independent of this parameter.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02370624
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