Exploration on Phenotypic Correlation Coefficient among Main Characters of Tea Plant for Breeding Selection

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1. By using clones of 170 hybrid. individuals, the correlation coefficients between combined main characters were calculated with parents and their clonal plants of different ages. 2. Owing to the data of the past examinations and the calculated values including both the environmental and genetic variance in this design, any problem with those tested years, especially, the climatic differences could not be recognized. 3. But some relations between such characters as above mentioned could be certained by this preliminary research, so further studies are expected. 4. Most of the clones, used in this research, were so young for general tea-life, that we have been going to have more times of replication with larger number of clone. 5. The results are generally summarized as follows. a) Morphological characters of tea-leaf look to be fixed in the comparatively young ages. That is, they are thought to be high repeatable. b) The relations between their characters of parent and its clonal plants were seen as like as the previous description, even though the clonal plants were very young. c) With younger plants after setting, the correlation between the cold damage and the plant-age was significant on five percent level. d) The correlations between paired characters were high with two kinds of shoot at a different stage, one of them had one bud and four leaves, and the other one bud and five leaves. e) The correlation between two kinds of damage devided with the external appearance on leaf in cold and dry winter could hardly been found. f) In connection with the winter damage, only the leaf-type showed a large coefficient of correlation between plant ages or between parent and its clonal plants, but not among the other characters. g) The authors will have to study, in future, with more numerous combinations, on the genetic correlation and heritability excepted the environmental variance. h) The correlation coefficients between the characters of young tea plant before setting are clearly different one another with the different combinations pollinated, and owing to taking care of the genic combination, linkage and so on the authors expect to test combining ability or to do selection by every combination. i) On the correlation after setting, the rooting-ratio may be variable on account of transplanting. Then the authors must take charge of the advanced research in future. j) From the technical point of view, the authors will need to use fifty individuals every other combination at least, as materials for such a calculation. And, further more, theoretically, the authors would want one hundred or two hundred individuals. On this point, the authors intend to study on the other day, taking counsel with their staffs.
日本茶業技術協会の論文

Exploration on Phenotypic Correlation Coefficient among Main Characters of Tea Plant for Breeding Selection

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