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Some Characters Inherited Independently of Reaction to Physiologic Races of Cercospora Oryzae in Rice 1
Author(s) -
Jodon N. E.,
Chilton S. J. P.
Publication year - 1946
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/agronj1946.00021962003800100002x
Subject(s) - agricultural experiment station , cercospora , citation , agriculture , agricultural science , horticulture , political science , library science , biology , history , computer science , archaeology , leaf spot
R to physiologic races ~, 2, 3, and 4 of Cercospora oryzae, as established by Ryker (7), ~ may be controlled by single dominant or duplicate factors for resistance (3, 9). Close linkage factors for resistance to races ~ and 2 were reported (8), but in crosses previously studied (9) circumstances prevented the testing for linkage between factors for Cercospora resistance and other segregating characters. Information on linkage relationships, in addition to its genetic interest, is of use in selecting for varietal improvement. Seventeen crosses were grown in the P~ generation in ~943 and z944 a~d segregations for reaction to physiologic races of oryzae and for other characters were tested in all possible combinations for linkage. There are ~ 2 chromosome pairs in rice, but in only one of the linkage groups so far reported, that between a factor for anthocyanin color in the apiculus of the hull and the glutinous (waxy) endosperm gene, is the relationship sufficiently well established to serve as a definite linkage tester.