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Tester Sampling Bias in the Topcrossing of Inbred Lines of Corn 1
Author(s) -
Salazar Angel B.,
Lonnquist John H.
Publication year - 1963
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1963.0011183x000300040011x
Subject(s) - library science , citation , zea mays , biology , computer science , agronomy
T HE topcross testing procedure has been used extensively in corn breeding programs since the first published report on the use of inbred-varletT crosses by Davis. ~ Literature ~elating to the effectiveness of the method is rather extensive. Considerable attention has been directed to the problem of number and types of testers. Howev.er, studies on the effect of differential sampling of tester gametes from heterogeneous testers, where lines differing in time of flowering were topcr.ossed, have not been reported. The effect of tester gamete variation could be important since any group of lines being topcrossed usually varies in time of flowering and might, therefore, be pollinated by cltzite different fractions of the gamete population from the tester parent. This differential sampling of the tester gamete population could introduce a bias in the evaluation of a group of lines if it were associated with differential behavior in the resulting crossed progeny. The effect of pollen samples collected from early and late flowering plants from varietal .testers was studied in croses to four inbred lines differing in maturity. The results are reported herein.