Summary
1. Meiosis is normal and has been followed through all stages from pachytene to second metaphase inCrepis capillaris (L.) Wallr. andC. tectorum L. A quantitative analysis of chiasma behaviour has been made for each kind of bivalent. Chiasma frequency is low, the majority of bivalents inC. capillaris having only one chiasma.
2. The satellitedD chromosomes in both species are observed to be attached to the nucleolus at both the first and the second meiotic divisions.
3. The two chromosomes of a bivalent are coiled about one another in the early stages. Uncoiling is gradual and complete by diakinesis.
4. Bivalents of theC chromosomes have single terminalised chiasmata at mid-diakinesis, whereas single chiasmata in the longerA andD bivalents rarely terminalise.
5. Similar chromosomes ofC. capillaris andC. tectorum show closely similar mean chiasma frequencies during diakinesis, and the same types of bivalent configuration.
6. Chiasma frequency at mid-diakinesis is almost directly proportional to length.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Avery, Priscilla (1930). “Cytological studies of five interspecific hybrids ofCrepis leontodontoides.”Univ. Calif. Publ. agric. Sci. 6, 135–67.
Babcock, E. B. andClausen, J. (1929). “Meiosis in two species and three hybrids ofCrepis and its bearing on taxonomic relationship.” Ibid.2, 401–32.
Belling, J. (1927). “The attachments of chromosomes at the reduction division in flowering plants.”J. Genet. 18, 177–205.
—— (1931). “Chiasmas in flowering plants.”Univ. Calif. Publ. Bot. 16, 311–38.
Collins, Julius L. (1920). “Inbreeding and crossbreeding inCrepis capillaris (L.) Wallr.”Univ. Calif. Publ. agric. Sci. 2, 205–16.
Collins, J. L., Hollingshead, Lillian andAvery, Priscilla (1929). “Inter-specific hybrids inCrepis. III. Constant fertile forms containing chromosomes derived from two species.”Genetics,14, 305–20.
Collins, J. L. andMann, Margaret C. (1923). “Interspecific hybrids inCrepis. II. A preliminary report on the results of hybridisingCrepis setosa Hall. withCrepis capillaris (L.) Wallr. and withC. biennis L.” Ibid.8, 212–32.
Darlington, C. D. (1930). “Chromosome studies inFritillaria. III. Chiasma formation and chromosome pairing inFritillaria imperialis.”Cytologia,2, 37–55.
Darlington, C. D. andDark, S. O. S. (1932). “Origin and behaviour of Chiasmata. II.Stenobothrus parallelus.” Ibid.3, 169–85.
Darlington, C. D. andJanaki-Ammal, E. K. (1932). “The origin and behaviour of chiasmata. I. Diploid and tetraploidTulipa.”Bot. Gaz. 93, 296–312.
Digby, L. (1914). “Critical study of the cytology ofCrepis virens.”Arch. Zellforsch. 12, 97–146.
Heitz, E. (1931). “Die Ursache der gesetzmässigen Zahl, Lage, Form und Grösse pflanzlicher Nukleolen.”Planta,12, Heft 4.
Hollingshead, Lillian (1930). “Cytological investigations of hybrids and hybrid derivatives ofCrepis capillaris andCrepis tectorum.”Univ. Calif. Publ. agric. Sci. 6, 55–94.
Maeda, T. (1930a). “The meiotic divisions in pollen mother cells of the sweet pea (Lathyrus odoratus) with special reference to the cytological basis of crossing over.”Mem. Coll. Sci. Kyoto,5, 125–37.
—— (1930b). “On the configurations of gemini in the pollen mother cells ofVicia Faba L.” Ibid.5, 125–37.
Mann, Margaret Campbell (1925). “Chromosome number and individuality in the genusCrepis. I. A comparative study of the chromosome number and dimensions of nineteen species.”Univ. Calif. Publ. agric. Sci. 2, 294–314.
Marchal, E. (1920). “Recherches sur les variations numériques des chromosomes dans la série végétale.”Mém. Acad. R. Belg. sér. 2,4, 1–108.
McClintock, Barbara (1931). “Cytological observations of deficiencies involving known genes, translocations and an inversion inZea mays.”Bull. Mo. agric. Exp. Sta. No. 163, pp. 2–30.
Moffett, A. A. (1932). “Chromosome studies inAnemone. I. A new type of chiasma behaviour.”Cytologia,4, 26–37.
Navashin, M. (1925). “Morphologische Kernstudien derCrepis-Arten in Bezug auf die Artbildung.”Z. Zellforsch. 6, 195–233.
—— (1927). “Über die Veränderung von Zahl und Form der Chromosomen infolge der Hybridisation.” Ibid.4, 171–215.
—— (1929). “Studies on polyploidy. I. Cytological investigations on triploidy inCrepis.”Univ. Calif. Publ. agric. Sci. 2, 377–400.
Newton, W. C. F. (1927). “Chromosome studies inTulipa and some related genera.”J. linn. Soc. (Bot.),47, 339–54.
Newton, W. C. F. andDarlington, C. D. (1930). “Fritillaria Meleagris: chiasma formation and distribution.”J. Genet. 22, 1–14.
Poole, Charles F. (1931). “The interspecific hybrid,Crepis rubra × C. foetida, and some of its derivatives. I.”Univ. Calif. Publ. agric. Sci. 6, 169–200.
—— (1932). “The interspecific hybrid,Crepis rubra × C. foetida, and some of its derivatives. II. Two selfed generations from an amphidiploid hybrid.” Ibid.6, 231–55.
Richardson, M. Margaret (1934). “The origin and behaviour of Chiasmata. X.Spironema fragrans.”Cytologia,5, 337–54.
Rosenberg, O. (1909). “Zur Kenntniss von den Tetradenteilungen der Compositen.”Svensk bot. Tidskr. 3, 64–77.
—— (1918). “Chromosomenzahlen und Chromosomendimensionen von der GattungCrepis.”Arch. Bot. 15, 1–16.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Richardson, M.M. Meiosis inCrepis . Journ. of Genetics 31, 101–117 (1935). https://doi.org/10.1007/BF02982282
Issue Date:
DOI: https://doi.org/10.1007/BF02982282