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Effects of Male‐Sterile Cytoplasm on Yields and Other Agronomic Characteristics of Corn Inbreds and Hybrids 1
Author(s) -
Josephson L. M.,
Kincer H. C.
Publication year - 1962
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/cropsci1962.0011183x000200010013x
Subject(s) - crop , hybrid , biology , division (mathematics) , horticulture , agricultural science , agronomy , mathematics , arithmetic
These studies were with A14 (a South African inbred) and Tl15, both natural restorers of Texas male-sterile cytoplasm, and T206, T220, and T212, non-restoring inbreds. A14 and T115 were crossed on Texas male-sterile cytoplasm carried in TX61M~ and T101, respectively, and 7 backcrosses by A14 and 5 backcrosses by Tl15 were subsequently made. Norma! cytoplasm counterparts of each inbred were obtained by pollinating the normal inbreds by the versions containing male-sterile cytoplasm. These reciprocal backcrosses were made with the same plants in all instances to have the same degree of inbreeding in comparing the two types of cytoplasm. The 2 types of cytoplasm in Al4 were crossed by Tl15 and the 2 types in Tll5 by Tlll for testing as single crosses. Texas male-sterile cytoplasm from TX203 and the restoring gene from T115 were incorporated into the 3 non-restoring inbreds and 5 backcrosses were made to fertile plants. Following the fifth backcross, fertile plants were self pollinated to obtain seed with at least 75% of fertile plants. Pollen frmn the same self-pollinated plants was used to pollinate the normal inbreds to obtain seed with normal cytoplasm of the same relative degree of inbreeding. Seed for sterile plants was obtained by making a sixth backcross of the normal inbred to sterile progeny. The three types of plants available for comparison i each inbred were the following: