Approaches to Transfer of Characteristics Between Ploidy Levels in New Guinea Impatiens

Weigle, J. L.; Pasutti, David W.

doi:10.17660/actahortic.1976.63.13

Cited by 5 publications

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“…(2,3). Exceptions to this have also been reported (12,14). Crosses using natural diploids and artificial polyploids indicated that intraploidy crosses, i.e., 2x x 2x or 4x x 4x, regardless of differences in base chromo some numbers were productive, but that interploidy crosses such as New Guinea (2x;=32) x Java (4x=32) and Java (2x=16) x Celebes (4x=16) did not set seed (2).…”

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Hybridization Among Diploid and Tetraploid Forms of New Guinea, Java, and Celebes Impatiens spp.1

Arisumi

1978

J. Amer. Soc. Hort. Sci.

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Interspecific hybrids were synthesized by intercrossing diploid and tetraploid of Impatiens spp. from New Guinea (2x=32), Java (2x=16), and Celebes (2x=8). Breeding analysis of the intra- and interploidy crosses showed that the species functioned as diploids in relation to each other. Diploid by tetraploid crosses produced little or no seed, and with few exceptions the triploid seedlings were sterile. All but 2 out of 43 seifs and reciprocal crosses among tetraploids produced viable seed. Amphidiploid and autotetraploid seedlings were pollen and seed fertile. Allotetraploids composed of 2 or 3 genomes in various unequal combinations and those with 4 genomes were pollen and seed sterile or nearly so. Most of the 3 and 4 allopolyploids were ornamentally inferior to the diploid and amphidiploid hybrids. New Guinea flower colors were recessive to those of Java and Celebes. The hybrid phenotypes were midparental for most traits and in some cases exhibited dosage effects. Some hybrids were superior to both parents in certain ornamentally important attributes.

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confidence: 90%

Hybridization Among Diploid and Tetraploid Forms of New Guinea, Java, and Celebes Impatiens spp.1

Arisumi

1978

J. Amer. Soc. Hort. Sci.

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“…Hewett et al ( 8) found a significant increase in injury when apple flowers were kept wet for 24 hr before freezing, but that there was little difference in injury between dry control flowers and flowers that had been wet just prior to freezing. Desiccation studies on apple flowers (6,11) and fruit (3) indicate that dehydration increases hardiness.…”

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confidence: 99%

Chromosome Numbers and Comparative Breeding Behavior of Certain Impatiens from Africa, India, and New Guinea1

Arisumi¹

1980

J. Amer. Soc. Hort. Sci.

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Chromosome counts were made of 10 Impatiens spp. L. from Africa, 5 from India, and 6 from the New Guinea-Indonesia area. Chromosome numbers reported for the first time were 2x = 16 for Impatiens auricoma Baill., I. epiphytica G. M. Schulze, and I. marianae Reichb. Counts that differed from previous reports were 2x = 18 for I. campanulata Wight, 2x = 36 for I. hookeriana Arn., and 2x = 32 for I. mooreana Schltr. Breeding tests with 20 species showed that 6 were self-incompatible. Crosses between species from different geographic groups were incompatible. Four out of 72 possible crosses among 9 African species and 30 out of 30 among 6 New Guinea-Indonesia species were compatible. The 20 crosses among 5 Indian species were all incompatible. Aborted embryos were observed in 57 incompatible crosses.

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Growth-regulator effect on New Guinea Impatiens hybrids

Pasutti

Weigle

1980

Scientia Horticulturae

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Approaches to Transfer of Characteristics Between Ploidy Levels in New Guinea Impatiens

Cited by 5 publications

References 0 publications

Hybridization Among Diploid and Tetraploid Forms of New Guinea, Java, and Celebes Impatiens spp.1

Hybridization Among Diploid and Tetraploid Forms of New Guinea, Java, and Celebes Impatiens spp.1

Chromosome Numbers and Comparative Breeding Behavior of Certain Impatiens from Africa, India, and New Guinea1

Growth-regulator effect on New Guinea Impatiens hybrids

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