File:Contributions from the Botanical Laboratory, vol. 11 (1934) (20500278448).jpg

Title: Contributions from the Botanical Laboratory, vol. 11
Identifier: contributionsfro11univ (find matches)
Year: 1934 (1930s)
Authors: University of Pennsylvania. Botanical Laboratory; University of Pennsylvania. Morris Arboretum
Subjects: Botany; Botany
Publisher: Philadelphia : (s. n. )
Contributing Library: Penn State University
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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Figs. 3-9.—Somatic metaphase plates of poinsettias: fig. 3, Euphorbia pulcherrima var. white, 20=28; fig. 4, E. pulcherrima var. oak, 2n=28; fig. 5, E. pulcherrima var. oakXwhite, 2n=28; fig. 6, E. pulcherrima, 20=28; fig. 7, E. geniculata, 20=28; fig. 8, E. dentata, 20 = 28; fig. 9, E. heterophylla, 20 = 56. X2000. 682 BOTANICAL GAZETTE (JUNE den (2). This hybrid has pink bracts and leaves similar to the oak variety. No electrophoretic curve is given for this cross. All of the species investigated in this group which have similar surfaces on their latex particles, as shown by the resemblance of the curves and the position of the isoelectric points (table I), have also like chromosome numbers. Although the curve of E. gemculatais somewhat divergent, it likewise has a diploid number of 28. On the other hand, E. heterophylla appears to be tetraploid with a somatic complement of 56 chromosomes, and it is therefore genetically very different from the other species. TABLE I Chromosome numbers and isoelectric POINTS of poinsettias Species E. deotata E. pulcherrima • E. pulcherrima var. white E. pulcherrima var. oak • • E. pulcherrima var. whiteXoak. E. geoiculata E. heterophylla Latex isoelectric POINT (pH) 3 9 3 3 3 3 4 8 9 9 7 7 I Chromo- some NUM- BER (2N) 28 28 28 28 28 28 56 In this connection it is interesting to note that Zade, by the im- munological reactions of the seed proteins (16), was able to separate re varLs species of Triticun. and A.ena into groups which are dentical with those already formulated on a taxonomic basis. In a study of the chromosomes of TriHcum^ Sakamura (12) and later SAX (13 reported that each group has different chromosome num- bers The haploid numbers are as follows: emkorn group = 7, em- ^e 'groupixl and spelt group = .x. Kihara (7) likewise showed The ime Vol relationship between the eh,omo»„e nurnbe s of different species of Avena and the groups proposed by Zade. In a cfen^Lal s^^^^^^^ of the purified prolamines of corns and wheats, HZlldU™™ (6) were unable to show any es«n..aM.ffe - ences between the prolamines from the three wheat ^^^^^^^^^^^^ able to diflerentiate the wheat and corn groups. Their work was

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