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Factors Associated with Grasshopper Resistance in Four Spring Wheat Crosses 1
Author(s) -
Grafius J. E.,
Hehn E. R.
Publication year - 1950
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1950.00021962004200070006x
Subject(s) - citation , resistance (ecology) , computer science , agronomy , library science , biology
N an earlier paper (I), strong negative correlation I coefficients were obtained between the amount of mechanical tissue in the upper part of the culm of spring wheat, Tri t icum aestivum L., and susceptibility to injury by grasshoppers, Melanoplus bivittatus (Say). T h e number of heads clipped was used as the measure of resistance. Although the mechanical tissue measurement eliminated the need for artificial infestations of grasshoppers in the early generations of selection, it proved too laborious for more than a few observations. It was reasoned. that the mechanical tissue could be estimated from the strength and diameter of the culm section. Such proved to be the case. This paper pertains to: (a) the establishment of differences between the F, cross means of resistant x susceptible and susceptible x susceptible crosses; (b) the estimation of heritability by means of F,-F, correlations; and (c) correlations between the breaking strength and diameter of culm sections and actual grasshopper resistance among 20 F, families.