Studies on the Utility of Assam Varieties in Tea Plant Breeding (Part 1)

概要

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In the F1 progenies crossed in 1960, the growth, characters of mature leaves and buds, number of buds, yield of first crop were investigated. The heritability (values, indexes) of height and width of tea bush were 0.436 and 0.554 respectively. As the lateral growth of the Indian varieties was very poor, it was necessary to select such varieties that had ample lateral growth in order to improve the vigor of Indian progenies. The heritability (value) of the extent of mature leaf was so high as 0.700 that suitable varieties having corresponding leaf extent of Indian varieties should be utilized in crossing. C 17 was a variety which had a moderate leaf extent for this purpose. The heritability (value) of number of buds was 0.563 but that of yield of first crop was so low as 0.1562 that it was not easy to get a high yielding variety. From the results of these tests, the important points to utilize Indian varieties for crossing are (1) vigorous lateral growth of bush, (2) large number of buds, (3) moderate characters of mature leaves and plucked leaves. It is also necessary to get a wide variation in F1 by large scale crossing combinations.
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