<i>In vitro</i> pollen germination and viability of a Java × New Guinea <i>Impatiens</i> interspecific hybrid

Hicks, Cory; Stephens, Loren C.; Weigle, J. L.

doi:10.1139/b87-270

Cited by 5 publications

(5 citation statements)

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“…Pollen viability, as determined by the in vitro germination assay, has already been mentioned as being correlated to fertilization success (Hicks et al 1987). Because this criterion (germination %) generally follows that of the pollen-tube length, the relative importance of each one has not been discussed (Kuo et al 1981).…”

Section: Discussionmentioning

confidence: 99%

Influence of season on rose pollen quality

Gudin¹,

Aréne²,

Bulard³

1991

Sexual Plant Reprod

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In vitro tests of pollen germination were carried out at different periods during an annual cycle in order to study environmental influence on the quality of Rosa hybrida L. pollen during its maturation process. This quality was evaluated by taking into account the rate of germination as well as the average length of emitted pollen tubes. In addition, during an annual hybridization period, a few pollinations were carried out in vivo with pollen of the same origin in order to study the evolution of the fertilization results, as attested by number of achenes per resulting hips. During the period covered by the experiments, the evolution of the pollen quality detected in vitro can be related to that of seed setting success. Of the two criteria used in vitro to evaluate pollen quality, the factor most liable to influence in vivo fertilization success seems to be the average length of emitted pollen tubes.

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Section: Discussionmentioning

confidence: 99%

Influence of season on rose pollen quality

Gudin¹,

Aréne²,

Bulard³

1991

Sexual Plant Reprod

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“…2a and b). A previous study of pollen germination of 7851-1 showed that small pollen failed to germinate, whereas large grains germinated at normal rates ( HICKS et al 1987). This, combined with crossing data, leads to the conclusion that 7851-1 is functioning as a triploid containing 3 genomes (AAB), 2 from I. hawkeri and 1 from I. platypetala (Table 1).…”

Section: Discussionmentioning

confidence: 79%

“…In spite of the different ploidies amongst these species and the corresponding sterility barriers, some interspecific hybrids have been found pollen fertile (PASUTTI et al 1977;PASUTTI and WEIGLE 1980;HICKS et al 1987;STEPHENS et al 1988). One hybrid seedling in particular, I .…”

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confidence: 99%

“…One hybrid seedling in particular, I . hawkeri x platypetala 785 1 -1, had pollen that varied in size, with only the larger pollen grains capable of in vitro germination (HICKS et al 1987). Additionally, 7851-1 was successfully crossed to Tangeglow, a commerical seed-propagated cultivar, and 7851-1 was used as the recurrent pollen parent in 2 successive backcrosses (STEPHENS et al 1988).…”

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confidence: 99%

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Formation of Unreduced Pollen by an Impatiens Hawkeri × Platypetala Interspecific Hybrid

Stephens

2004

Hereditas

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The Impatiens hawkeri Bull. x I. platypetala Lindl. hybrid 7851-1 was studied for characteristics of unreduced pollen.When I. hawkeri x platypetah 785 1-1 (2n = 24) was crossed as a pollen parent to I. hawkeri x aurantiaca Tangeglow (2n = 24), offspring contained somatic chromosome numbers ranging from 2n = 30 to 2n = 36. In root-tip cells of each of these offspring, there were 4 I. aurantiara chromosomes, as expected after normal meiosis of the seed parent Tangeglow. This result showed that unreduced pollen was contributed by 7851-1. Additionally, a study of 7851-1 micropores showed that, at the tetrad stage, 76 'X o f cello w.xe dyads, and microspores forming from dyads of 7851-1 were noticeably larger than microspores forming the tetrads. An examination of pollen meiosis in 7851-1 showed that the meiotic mechanism for unreduced pollen formation was parallel spindles in the second meiotic division. As a seed parent, 7851-1 was sterile both in crosses and by self pollination. As a pollen parent, 7851-1 was successfully crossed only to seed parents containing I. uutwztiucu chromosomes, indicating that I . auvuntiacu is a bridging species in interspecific crosses involving I. haivkeri and I. plutypetala. The implications for breeding New Guinea Imputiens (I. huwkeri) cultivars using interspecific hybridization are discussed.

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“…One hypothesis is that 'Tangeglow' is a New Guinea x Celebes (' Tangerine') hybrid (Armstrong, 1976 (Pasutti, 1977). The hybrid '7851-1' is a 24-chromosome male-fertile, female-sterile plant derived from a New Guinea x Java cross (Hicks et al, 1987).…”

Section: A Description Of Plant Materialsmentioning

confidence: 99%

Fertility and chromosome number in interspecific Impatiens hybrids

Fruth¹

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The effects of chromosome number on female fertility of interspecific hybrids among Impatiens from Java (I. platypetala Lindl.), New Guinea (I. hawkeri Bull.), and Celebes (I. aurantiaca Teysm.) and the role of unreduced gametes in determining chromosome number and fertility were investigated. Two 24-chromosome interspecific hybrids were used as parents, 'Tangeglow' and 1 7851-1'. The F 1 offspring from this cross had chromosome numbers ranging from 28 to 36. Because 'Tangeglow' is seed-propagated and has normal meiosis, '7851-1' must have produced some male gametes that were incompletely unreduced and other gametes that were completely unreduced. The female fertility of interspecific hybrids with 36 chromosomes and 29 chromosomes was compared. The hybrids with 36 chromosomes exhibited greater fertility than the hybrids with 29 chromosomes. These results indicate that completely unreduced gametes provide for greater female fertility in the hybrid progeny because of the pre sence of complete genomes of Java and New Guinea Impatiens.

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In vitro pollen germination and viability of a Java × New Guinea Impatiens interspecific hybrid

Cited by 5 publications

References 4 publications

Influence of season on rose pollen quality

Influence of season on rose pollen quality

Formation of Unreduced Pollen by an Impatiens Hawkeri × Platypetala Interspecific Hybrid

Fertility and chromosome number in interspecific Impatiens hybrids

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