ISHS Acta Horticulturae 620: XXVI International Horticultural Congress: Asian Plants with Unique Horticultural Potential: Genetic Resources, Cultural Practices, and Utilization
INHERITANCE AND VARIATION OF NONBRANCHING HABIT IN CHRYSANTHEMUM |
| Authors: | H.K. Shin, S.Y. Choi, H.Y. Joung |
| Keywords: | branchless, branchlessness, segregation, progeny, branching, blind, axils |
| Abstract:
The inheritance of nonbranching (a habit that has no active buds in its leaf axils) in chrysanthemum was studied in 8 pollination groups using F1 progenies of 22 crosses and 1 selfing. These clones consisted of branchless and branching (normal) cultivars. Branching habit was dominant over nonbranching. The segregation for nonbranching in the progenies was 87% in a selfing of nonbranching standard (ST) cultivar, 73% in 3 crosses between nonbranching STs, 10.9% in 10 crosses of branchless STs x branching sprays (SPs), and 0% in a cross of branching ST x SP and 4 crosses between branching SPs. The percentages of nonbranching progenies varied with the parents. The variation of nonbranching expression in 32 nonbranching breeding lines was evaluated after the plants were overwintered under natural conditions. The expression was quantitative, continuous, and varied with the lines from 5.7 to 100% in the rate of blind leaf axils. The result showed that the nonbranching expression in chrysanthemum varied considerably with growth stages and was temperature dependable. | |
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