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Problems of Cane Breeding at the Present Stage of China from a Cytological Point of View

Chen Ching-Long
Botanical Gazette
Vol. 143, No. 4 (Dec., 1982), pp. 417-423
Stable URL: http://www.jstor.org/stable/2474756
Page Count: 7
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Problems of Cane Breeding at the Present Stage of China from a Cytological Point of View
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Abstract

From 1949 to the early 1970s, the sugarcane industry in China produced new clones that were well received by sugarcane growers. It became increasingly difficult to produce new clones, and a search for new germ plasm was conducted in the 1970s. Lines of Saccharum spontaneum were collected, and cytological observations on ca. 80 of these lines revealed 2n = 80, 64, 72, 68, and 116. Clones YC55/7 and 55/12, derived by crossing PO J2878 and Ya Cheng spontaneum, were shown to have arisen from self-pollination of POJ2878. The chromosome number of clone YC58/43, which was the F~1 offspring of Badila and Ya Cheng spontaneum, increased by 50%. After the second nobilization, a commercial variety, YT64/395, was produced. For efficient sugarcane breeding, unintegrated independent breeding projects must be rejected. Chromosome counts on a large scale, selection based on chromosome variation and phenotype, and hybridization of plants drawn and executed according to the theory of nobilization must be stressed.

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