1. |
THE DISAPPEARANCE |
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TAXON,
Volume 21,
Issue 1,
2019,
Page 3-12
Duane Isely,
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摘要:
Summary1The role of taxonomists — in the total social structure as well as the academic subculture — is evidenced by their disappearance.
ISSN:0040-0262
DOI:10.2307/1219215
出版商:Wiley
年代:2019
数据来源: WILEY
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2. |
COMPUTER‐BASED DATA BANKING FOR TAXONOMIC COLLECTIONS |
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TAXON,
Volume 21,
Issue 1,
2019,
Page 13-25
A. V. Hall,
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摘要:
SummaryThe criteria for an efficient system for data‐banking are reviewed. The efficiency is seen in the light of the problems of modest computer facilities, reducing the time for data capture, and having the simplest operating procedures that can meet most of the likely demands of the user. A program‐package developed to meet these criteria is described. The data are primarily those associated with specimen labels. Several directory files are used for abbreviated codings to give record compression. A simple system of instructions is used to retrieve records with desired characteristics and from them to give results in a variety of forms, including ordered listings with frequencies and geographical distribution maps. Full checking and editing facilities, with corrective error‐messages, are available for all critical operations. Experience with the system suggests a favourable cost/benefit relationship for work with special collections.
ISSN:0040-0262
DOI:10.2307/1219216
出版商:Wiley
年代:2019
数据来源: WILEY
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3. |
HI‐IAPT Portraits of Botanists, no. 1. |
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TAXON,
Volume 21,
Issue 1,
2019,
Page 26-26
William Aiton,
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ISSN:0040-0262
DOI:10.1002/j.1996-8175.1972.tb03221.x
出版商:Wiley
年代:2019
数据来源: WILEY
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4. |
THE MORPHOLOGY AND FLAVONOID CHEMISTRY OF SYNTHETIC INFRASPECIFIC HYBRIDS IN COREOPSIS MUTICA (COMPOSITAE). |
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TAXON,
Volume 21,
Issue 1,
2019,
Page 27-38
Daniel J. Crawford,
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摘要:
SummaryThe morphology and flavonoid chemistry of synthetic F1, first generation backcross, and F2hybrids involving two varieties ofCoreopsis muticaDC. were studied. The F1hybrids are variable in certain morphological features, particularly with respect to characteristics of the leaves. By contrast, there is little variation in the flavonoid components of these plants. First generation backcross hybrids fall within the range of variation of the recurrent parent, but retain certain compounds which are characteristic of the non‐recurrent parent. The F2hybrid plants are quite variable in their flavonoid components. The results of these greenhouse studies are related to observations of suspected natural hybridization and introgression.
ISSN:0040-0262
DOI:10.2307/1219218
出版商:Wiley
年代:2019
数据来源: WILEY
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5. |
TAXONOMIC PLACEMENT OF THE TYPHALES WITHIN THE MONOCOTYLEDONS: PRELIMINARY SEROLOGICAL INVESTIGATION.† |
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TAXON,
Volume 21,
Issue 1,
2019,
Page 39-44
David W. Lee,
David E. Fairbrothers,
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摘要:
SummaryThree types of serological precipitin techniques were employed, using seed extracts from selected monocotyledonous species and antisera toTyphaandSparganium. The obtained protein data were evaluated for use in helping to determine the placement of the Typhales within the monocotyledons. Data indicated the following: (1) significantly high serological correspondence betweenTyphaandSparganium, supporting the placement of these two genera within the order Typhales; (2) low serological correspondence between the Typhales and Liliales (in addition to some anomalous activity), indicating possible distant evolutionary relationships between these two orders; and (3) little or no serological correspondence between the Typhales and most of the tested monocotyledons, reflecting an isolated position for the Typhales within the monocotyledons.
ISSN:0040-0262
DOI:10.2307/1219219
出版商:Wiley
年代:2019
数据来源: WILEY
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6. |
PETAL AND POLLEN CAROTENOIDS OF TWO POLYMNIA ***SPECIES AND THEIR HYBRIDS |
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TAXON,
Volume 21,
Issue 1,
2019,
Page 45-55
James R. Wells,
Denis L. Fox,
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摘要:
SummaryYellow carotenoids were recovered quantitatively from fresh petals ofPolymnia maculata, P. uvedalia, and their reciprocal hybrids, as well as from fresh pollen of each parent and one of the hybrid plants. Thin‐layer chromatographic resolution, spectrophotometric measurements, partitional segregation both before and following saponification, chemical exploration for relative position of hydroxyl groups and for the presence of epoxy structures, and establishment of co‐sorbability of comparative fractions led to several conclusions: (1) The prominent fraction in all four experimental categories of petal carotenoids is a variously esterified polyhydroxy, monoepoxy derivative of α‐carotene; this, with minor, allied congeners of other esterified xanthophylls, constituted some 94 to 98% of total petal carotenoids. (2) The minor remaining, persistently epiphasic component yielded two chief fractions: a non‐epoxy and an epoxy‐carotene derivative. (3) Pollen samples each yielded a single molecular species of carotenoid which was an epiphasic, non‐saponifiable, non‐epoxy compound suggesting a dehydrocarotene derivative. (4) The relatively simple carotenoid complexes recovered from the reproductive parts of both supposed species ofPolymnia, as well as from their hybrids, are so closely similar as to lend support to the alternative view that they may be conspecific.
ISSN:0040-0262
DOI:10.2307/1219220
出版商:Wiley
年代:2019
数据来源: WILEY
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7. |
HI‐IAPT Portraits of Botanists, no. 2. |
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TAXON,
Volume 21,
Issue 1,
2019,
Page 56-56
Carlo Allioni,
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ISSN:0040-0262
DOI:10.1002/j.1996-8175.1972.tb03225.x
出版商:Wiley
年代:2019
数据来源: WILEY
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8. |
CHROMOSOME NUMBERS, PHYLOGENY, PHYTOGEOGRAPHY OF THE ANNONACEAE AND THEIR BEARING ON THE (ORIGINAL) BASIC CHROMOSOME NUMBER OF ANGIOSPERMS |
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TAXON,
Volume 21,
Issue 1,
2019,
Page 57-65
James W. Walker,
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摘要:
SummaryChromosome numbers are summarized within a novel taxonomic framework for the 22 genera of the primitive angiosperm family Annonaceae in which they are known. Chromosomal data are shown to be consistent with the author's concept of the phylogeny of the family, as independently determined from a study of pollen and floral morphology. This independently derived infrafamilial phylogeny suggests that there have beenminimally12 separate changes in base chromosome number within the family. Evidence is strong for considering x = 7 as the base chromosome number for the family, with parallel ascending aneuploidy: n = 7→8→9. Considerable parallel polyploidy has occurred on the older x = 7, polyploidy has occurred at least once on x = 8, while the most recent aneuploid number, x = 9, has not produced any polyploids as far as is known. Chromosome numbers, as well as pollen and floral morphology, are adduced to support the author's conclusion that the Annonaceae are of New World (and/or possibly African) origin. The significance of chromosome evolution within the Annonaceae is discussed as it bears on the choice of the basic chromosome number for the angiosperms (x = 7). Finally, the first chromosome count, n = 8, is presented for the annonaceous genusDesmopsisSaff.
ISSN:0040-0262
DOI:10.2307/1219222
出版商:Wiley
年代:2019
数据来源: WILEY
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9. |
HI‐IAPT Portraits of Botanists, no. 3. |
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TAXON,
Volume 21,
Issue 1,
2019,
Page 66-66
Giovanni‐Batista Balbis,
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ISSN:0040-0262
DOI:10.1002/j.1996-8175.1972.tb03227.x
出版商:Wiley
年代:2019
数据来源: WILEY
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10. |
CHROMOSOME PAIRING AND PHYLOGENETIC AFFINITIES† |
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TAXON,
Volume 21,
Issue 1,
2019,
Page 67-70
J. M. J. de Wet,
J. R. Harlan,
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摘要:
SummaryThe mechanisms of chromosome pairing are poorly understood. Yet, pairing during meiotic prophase is commonly assumed to indicate homology, and absence of pairing non‐homology between parental genomes. These assumptions lead to the widely accepted belief that data on chromosome pairing in hybrids provide indisputable evidence of degree of phylogenetic affinity between the parental taxa involved. Chromosome pairing usually, but not always, is a valid source of information on relationships in diploid hybrids, but rarely if ever provides conclusive evidence on affinities when polyploid taxa are involved.
ISSN:0040-0262
DOI:10.2307/1219224
出版商:Wiley
年代:2019
数据来源: WILEY
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