Tree and fruit characters of<i>Citrus</i>triploids from tetraploid by diploid crosses

Soost, R. K.; Cameron, J. W.

doi:10.3733/hilg.v39n20p569

Cited by 27 publications

(20 citation statements)

References 6 publications

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“…Five different crosses, each consisting of 6 sister triploid hybrids and their parents (Soost and Cameron, 1969) were used in the study. Crosses 1 and 2 each had a tetraploid Citrus paradisi Mad.…”

Section: Methodsmentioning

confidence: 99%

RIND AND LEAF OILS OF TRIPLOID INTERSPECIFIC CITRUS HYBRIDS AND THEIR DIPLOID AND TETRAPLOID PARENTS

Scora¹,

Cameron²,

Berg

1970

TAXON

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. International Association for Plant Taxonomy (IAPT) is collaborating with JSTOR to digitize, preserve and extend access to Taxon. SummaryRind and leaf oils of triploid Citrus hybrids from 5 crosses, and their diploid and tetraploid parents, were analysed by gas chromatography. Two-thirds of the chromosome complement of each hybrid was evidently contributed by the 4n parent. Overall, a wide range of percentages of the oil components occurred among hybrids and parents. There were differences significant at 1% in 80 of 90 parent-hybrid group comparisons. There was no regular, dominating effect of the 4n parents, and in many cases the influence of 4n and 2n parents seemed about equal. However, among hybrids involving 4n lemon there was often a tendency for leaf oil levels to follow those of that 4n parent. The general absence of such an effect in the rind oils, and in the leaf oils of the other crosses, parallels the implication of an earlier study in which autotetraploids of several Citrus species were usually similar to their parental diploids, in their percentages of rind oil components.Where 2 or 3 sets of hybrids had a common parent, either 2n or 4n, there was also no constant effect of that parent, from set to set, as compared to other parents involved. Variation in the percentages of any specific oil component was great among the 6 sister triploids in many crosses. Individuals sometimes approached the level of one parent, and sometimes that of the other. Transgression of one or more hybrids beyond either parent frequently occurred, and was particularly prominent with decanal, linalool, and linalyl acetate. Percentages of components in the leaf were often different from those in the rind.It is clear that these polyploid hybrids of rather closely related species show many inherited differences in oil components. These differences are principally quantitative and probably reflect genetic recombinations which have altered intermediate biochemical pathways.

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Section: Methodsmentioning

confidence: 99%

RIND AND LEAF OILS OF TRIPLOID INTERSPECIFIC CITRUS HYBRIDS AND THEIR DIPLOID AND TETRAPLOID PARENTS

Scora¹,

Cameron²,

Berg

1970

TAXON

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“…Citrus autotetraploids have been less vigorous and productive and fruit quality has been less desirable than diploid progenitors (Soost and Cameron, 1969), but some triploid hybrids have been developed that are reasonably vigorous and productive (Soost andCameron, 1980, 1985). The interest in triploids arises from their potential to pro-duce seedless fruit (Soost and Cameron, 1969), a commercially significant attribute. Triploid citrus plants have been recovered after endosperm culture in vitro ; however, the frequency of plant recovery via this route and the vigor of recovered plants have been unsatisfactory.…”

Section: Manipulating Ploidy Levelmentioning

confidence: 99%

Contemporary Approaches to Improving Citrus Cultivars

Gmitter¹

1994

horttech

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Traditional genetic manipulation methods have proven ineffective or irrelevant for many citrus breeding objectives. Alternative approaches to Citrus genetic improvement are now available as a result of technological developments in genetics and tissue culture. For example, mapping DNA marker polymorphisms should lead to identifying markers closely linked to important loci, thereby facilitating early selection and minimizing costs associated with plant size and juvenility. Genetic transformation methods allow trait-specific modification of commercial cultivars. By selecting beneficial variants from sectored fruit chimeras and the recovering plants via somatic embryogenesis, the problems of nucellar embryony and the hybrid nature of commercial cultivar groups can be avoided. Induced mutagenesis from mature vegetative buds may overcome these problems, as well as juvenility. Ploidy level manipulation in vitro can increase the number and diversity of tetraploid breeding parents, leading to the development of seedless Citrus triploids and mitigating sterility, incompatibility, and nucellar embryony.

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“…Among the breeding methods for developing seedless cultivars (SpiegelRoy, 1988) are the production of triploid hybrid seedlings (Soost and Cameron, 1969) and creating mutants by irradiation (Hearn, 1986). While cross breeding to develop diploid seedless cutlivars, we found a close relationship in seediness between hybrid progenies and parents; seedless or few seeded parents frequently produced seedless offsprings, whereas seedy or very seedy parents produced very few seedless offsprings (Yamamoto et al, 1992b).…”

Section: Introductionmentioning

confidence: 99%

Relationship between Sterility and Seedlessness in Citrus.

Yamamoto

Matsumoto

Yamada

1995

Engei Gakkai zasshi

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SummaryThe relationship of female and male sterility, and self-incompatibility to seed content in citrus were investigated using 22 male sterile and fertile cultivars. The male fertile cultivars were grouped into self-compatible and self-incompatible. Positive correlation (r = 0.927**, r2=0.859) existed between the average number of seeds per fruit obtained by hand pollination, which indicated the degree of female fertility, and that yielded by open pollination. This result indicates that the degree of female fertility and sterility can be estimated from seeds derived by open pollination. The difference between the average number of seeds per fruit by hand pollination and that by open pollination was greater in male sterile cultivars and in self-incompatible cultivars than it was in self-compatible cultivars. This indicates that self-incompatibility as well as male sterility is effective on the reduction of seediness. In open pollination, self-compatible cultivars produced very few seedless fruits, whereas male sterile and self-incompatible cultivars produced many seedless fruits.

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Tree and fruit characters ofCitrustriploids from tetraploid by diploid crosses

Cited by 27 publications

References 6 publications

RIND AND LEAF OILS OF TRIPLOID INTERSPECIFIC CITRUS HYBRIDS AND THEIR DIPLOID AND TETRAPLOID PARENTS

RIND AND LEAF OILS OF TRIPLOID INTERSPECIFIC CITRUS HYBRIDS AND THEIR DIPLOID AND TETRAPLOID PARENTS

Contemporary Approaches to Improving Citrus Cultivars

Relationship between Sterility and Seedlessness in Citrus.

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