A Numerical Taxonomic Study of Cucurbita

Rhodes, A. M.; Bemis, W. P.; Whitaker, Thomas W.; Carmer, S. G.

doi:10.2307/2805450

Cited by 27 publications

(15 citation statements)

References 11 publications

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“…This interpretation further indicates that the precursor of Xenoglossa first established a dependency upon the pollen Hurd and Linsley, 1970). * * The groups proposed in Table 3, closely correspond with those derived from a numerical taxonomic study of 20 species of Cucurbita (Rhodes, et al 1968). There are two exceptions: (1) C. pedatifolia did not show close affinities with other groups.…”

Section: Structural Diversity and Evolutionarysupporting

confidence: 72%

SQUASH AND GOURD BEES (PEPONAPIS, XENOGLOSSA ) AND THE ORIGIN OF THE CULTIVATED CUCURBITA

Hurd¹,

Linsley²,

Whitaker³

1971

Evolution

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Section: Structural Diversity and Evolutionarysupporting

confidence: 72%

SQUASH AND GOURD BEES (PEPONAPIS, XENOGLOSSA ) AND THE ORIGIN OF THE CULTIVATED CUCURBITA

Hurd¹,

Linsley²,

Whitaker³

1971

Evolution

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“…2). Groupings based on the nature of the Cucs present agree reasonably well with evolutionary groupings based on numerical taxonomy (16), cross compatibilities (17), and isozyme analysis (18). Group 1 included the Cuc B-and D-forming species: (a) C. andreana and C. ecuadorens*s, and (b) C. gracdlhor, C. palmeri, and C. sororta.…”

supporting

confidence: 62%

Cucurbitacins as kairomones for diabroticite beetles

Metcalf

Metcalf²,

Rhodes³

1980

Proc. Natl. Acad. Sci. U.S.A.

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200

123

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The characteristic bitter substances of the Cucurbitaceae act as kairomones for a large group of diabroticite beetles (Chrysomelidae, Galerucinae, Luperini), promoting host selection and compulsive feeding behavior. These beetles (e.g., Diabrotica undecimpunctata howardi) respond to as little as 1 ng of cucurbitacin (Cuc) B on thin-ayer plates by arrest and compulsive feeding. Six species of diabroticite beetles were about 10 times more responsive to Cuc B than to Cuc E and less responsive to Cuc D, I, and L Chloroform extracts of 18 species of Cucurbita were developed on thin-layer chromatograms and exposed to diabroticite beetles. The feeding patterns showed pronounced beetle responses to three general Cuc distribution patterns: Cuc B and D as in Cucurbita andreana and C. ecuadorensis; Cuc E and I as in C. okeechobeensis and C. martinezii; and Cuc E glycoside in C. texana. All the diabroticites responded in exactly the same feeding patterns. The results demonstrate a coevolutionary association between the Cucurbitaceae and the Luperini, during which the intensely bitter and toxic Cucs that arose to repel herbivores and protect the plants from attack became specific kairomone feeding stimulants for the beetles.The coevolutionary association between the plants of the family Cucurbitaceae and diabroticite beetles of the tribe Luperini,

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“…The numerical taxonomic study of Cucurbiia (Rhodes et al, 1968) was augmented by the inclusion of 22 interspecific F 1 hybrids, 1 intraspecific Fi hybrid, two additional cultivars of C. pepo and four unknown Cucurbita accessions, making a total of 53 operational taxonomic units (OTU's). The objectives of this additional study are: (1) to determine if inclusion of the additional OTU's will alter the species grouping in phenograms; (2) to determine clustering patterns of F 1 interspecific hybrids with relation to their parent species; (3) to determine if the parent species of F 1 interspecific hybrids can be identified; and (4) to determine the possibility of identifying wild variants that do not fit the description of known Cucurbita species.…”

mentioning

confidence: 99%

“…However, specific floral character states could be recognized from photographs and the diagrams of Bailey (1943); these were included in the study. The list of 93 characters, character states, and arithmetic codes is given as an appendix in Rhodes et al (1968) and is not repeated here. The plants are indeterminant, many branched vines, and under greenhouse cultiva-tions are prolific producers of flowers and fruit with the exception of the three species previously mentioned.…”

mentioning

confidence: 99%

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Numerical Taxonomy Applied to Cucurbita Relationships

Bemis

Rhodes

Whitaker

et al. 1970

American J of Botany

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In a numerical study of taxonomic relationships in Cucurbita, the inclusion of F1 interspecific hybrids did not materially alter the species grouping in the phenogram. The F1 interspecific hybrids tend to cluster with one of the parent species or species groups unless the parents are widely divergent. Also, the F1 interspecific hybrids between wild and domesticated species cluster with the wild parent Both parent species or species groups of an F1 interspecific hybrid can usually be determined from Q‐correlation values. It is essential that compatibility relations be determined between species; i.e., species groups must be established before Q‐correlation values can be successfully used in determining the parentage of hybrids. Undescribed collections can usually be correctly placed in the proper species group.

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A Numerical Taxonomic Study of Cucurbita

Cited by 27 publications

References 11 publications

SQUASH AND GOURD BEES (PEPONAPIS, XENOGLOSSA ) AND THE ORIGIN OF THE CULTIVATED CUCURBITA

SQUASH AND GOURD BEES (PEPONAPIS, XENOGLOSSA ) AND THE ORIGIN OF THE CULTIVATED CUCURBITA

Cucurbitacins as kairomones for diabroticite beetles

Numerical Taxonomy Applied to Cucurbita Relationships

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