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Geneto Studies on Cadmium Tolerance at Seedling Stage in Rice Plant
耐性品種Kang Lung Do、台北108及農林37與三個敏
Three cadmium tolerant rice varieties ie., Kang Lung Do, Tpipei No.108, and Nohrin No.37, and three sensitive varieties, ie, Kae Bye,Tainung No.28, and Taipei No.103, were used for diallel crosses analysis. The seeds of F1 and F2 were used to do the genetic analysis of cadmium tolerance on the root length root、number、seedling height、total seedling height、shoot dry weight、root dry weight and total seedling dry weight. The results of the experiments are summarized in the followings:
1.Diallel analysis of cadmium tolerance in rice:
(1)The results of diallel analysis indicated that the 7 characters of 6 varieties differed from varieties to varieties and also from different cross combination.
(2)The result of regression analysis were invided into two sections: One was observed that the shoot dry weight、root length、root number、seedling height and total seedling height were controlled by partial dominance. The other was observed that root dry weight and total seedling dry weight were controlled by over dominance
(3)The results of estimates of genetic components and genetic analysis: It was observed that shoot dry weight, root dry weight, seedling height and total seedling dry weight were controlled by the dominance gene and the addition effect of polygene. Root length, and total seedling height were controlled by dominance gene. Mean degrees of dominance on all characters were over dominance. Ratio of total number of dominance to recessive genes in parent were unequal.
2.Phenotypic correlations of F2 populations:
(1)Phenotypic correlations among all pairs of 7 characters were observed. Root length with shoot dry weight and seedling height were significant positive correlation when the population were treated, but untreated population were no significant difference.
(2)Heritabilities are different when the characters and populations were different. For the most results, the heritability of cross combination of Tainung No.28 X Nohrin No.37 were maximal, and of Tainung No.28 X Kang Lung Do were next.
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