3. Mitochondrial Heterosis
نویسندگان
چکیده
منابع مشابه
MITOCHONDRIAL HETEROSIS IN MAIZE1p2
M A N Y hybrids between genetic pure lines in maize exhibit heterosis. The search for the genetic basis of heterosis has been carried on for many years and by many workers. Despite these efforts, an adequate, specific biochemical explanation of heterosis has not been presented. JONES (1952) has noted the interaction of nuclear genes and cytoplasm, as evidenced by differences in reciprocal cross...
متن کاملMitochondrial Polymorphism in Maize. II. Further Evidence of Correlation of Mitochondrial Complementation and Heterosis.
HAT heterosis is a genetic phenomenon cannot be doubted. And yet, in spite of our awareness of this phenomenon for many years, genetic mechanisms responsible for heterosis have not been demonstrated operationally ( SARKISSIAN 1967). That is, it has not been possible to define heterosis-superior growth of a hybrid-in terms of actual operations o r experimental treatments that may have been appli...
متن کاملHeterosis: Theory and Estimation
Heterosis is the foundation of modern maize breeding programs. Despite its importance in maize production, we know surprisingly little about the genetic basis of heterosis. Shull (1952) coined the term heterosis and defined it as: "... the interpretation of increased vigor, size, fruitfulness, speed of development, resistance to disease and to insect pests, or to climatic rigors of any kind, ma...
متن کاملWhat Is “ Heterosis ” ? L
T IS not my purpose in this paper to present or to discuss the actual basic I causes or the fundamental mechanisms which bring about the increased size, the excessive kinetic energy, the increased productiveness, resistance to disease or to unfavorable conditions of the environment, the “stimulating effects of hybridity,” the so-called “hybrid vigor” of English writers and “Luxurieren” of many ...
متن کاملHeterosis resulting from degenerative changes.
ERITABLE variations in inbred strains of maize occur infrequently. All H the mutations BO far found either do not increase the amount of growth and productiveness or clearly reduce the plants in some degree (JONES 1924, 193a, 1944; SINGLETON 1943). Several changes have been noted recently and reported in a preliminary way (JONES 1944) which reduce the vigor of the inbred plants but which increa...
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ژورنال
عنوان ژورنال: Poultry Science
سال: 1974
ISSN: 0032-5791
DOI: 10.3382/ps.0531306