Theoretical studies on the methodological procedures of radiation breeding |
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Authors: | Yoshio Yoshida |
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Institution: | (1) Kyushu Agricultural Experiment Station, Chikugo, Fukuoka Pref., Japan |
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Abstract: | If the expectation of the number of desirable mutants for equal size of X
2-populations decreases with decreasing number of plants per X
2-line, the one-plant-one-grain method (method C), the one-plant-two-grain method (method D), and the one-plant-three-grain method (method E), especially method C, would be disadvantageous in comparison with the improved ear-to-row method (method B) and the conventional ear-to-row method (method A).From theoretical considerations it can be shown that a probability of occurrence of an X
2-line containing desirable mutant (p
1) and a conditional probability of occurrence of such desirable mutant for each one of the plants in such an X
2-line (p
2) are not affected by the number of X
2-lines (m), but by the number of plants per X
2-line (n). Consequently, the expectation of the number of desirable mutants in an X
2-population, E(I), can be given by
E(I) = mp
1(1– q
2
n · n p
2/(1 –q
2
n) = mn p
1
p
2
where p
1+q
1=1 and p
2+q
2=1.Therefore, with respect to E(I), method A=B=C=D=E for equal size of X
2-populations. However, method A B E>D>C for different sizes of X
2-populations.Most of this work was carried out in the National Institute of Agricultural Sciences, Hiratsuka, Japan. |
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Keywords: | |
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