Abstract
Abstract The breeding behavior of polyploid Dendrobium orchids (N=19) was investigated by making crosses involving diploids, triploids and tetraploids. Seedlings were obtained from various combinations, although the percentages of viable seed was low for crosses involving triploids. 2N × 2N crosses produced 2N offspring, 4N × 4N crosses produced 4N offspring and 2N × 4N and 4N × 2N crosses produced 3N offspring. 2N × 3N and 3N × 2N crosses gave rise to predominantly 4N progenies and small percentages of aneuploids between the 2N and 3N levels. The increase in ploidy can be attributed to the functioning of unreduced 3N gametes from the 3N parent and the normally reduced N gametes from the 2N parent. 3N × 4N and 4N × 3N crosses produced variable progenies of 5N and aneuploid offspring between the 3N and 4N levels.
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