Chromosome Studies in Hyacinthus orientalis L.: I. The Somatic Chromosomes

Naithani, S. P.

doi:10.1093/oxfordjournals.aob.a083452

Cited by 12 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Except for TrilZium, in which direct observation of the origin of the major spiral has been claimed (Swanson 1942;Huskins & Smith, 1935), the order of formation of the major and minor spirals is a matter for speculation. Some authors, notably Kuwada & Nakamura (1933, 1934, Darlington (1935), Swanson (1942Swanson ( , 1943, have thought that the major spiral forms first and the minor after it, but other authors, for example , Naithani (1937), and Coleman & Hillary (1941), have interpreted the two in the reverse order; in neither case is conclusive evidence available.…”

Section: The Minor Spiralmentioning

confidence: 99%

See 1 more Smart Citation

The Spiral Structure of Chromosomes

Manton¹

1950

Biological Reviews

View full text Add to dashboard Cite

Summary . i. Sufficient examples of spiral structure of chromosomes are now known from dicotyledons, monocotyledons, pteridophytes and perhaps gymnosperms, together with some animals, to show that the phenomenon is a fundamental one in the plant and animal kingdoms, at least in the higher groups. 2. Various methods found to be effective for revealing the spiral are listed, though the spiral itself cannot be an artifact. 3. Since 1939, new observations have been made on the following principal topics: (a) chromonema length; (b) direction of coiling, especially in a somatic chromosome; (c) prophase development leading to generalizations about ‘gyre elimination’ as a normal part of the spiralization cycle; (d) geometrical form of the spiral. 4. Unification of terminology is recommended by general adoption of the terms plectonemic and par anemic to describe the geometrical form of the spiral. The term ‘standard coil’ is recommended to replace ‘minor spiral’ for contrasting the major spiral with those of other types of division. 5. The need is stressed for further evidence on the minor spiral in the strict sense. 6. The importance of the interpretation of the ‘telophase split’ and of the origin of relational coiling for an understanding of the functional importance of the whole phenomenon of spiral structure is stressed. The suggestion made in earlier publications is repeated that the functional significance of the spiral might be that of co‐ordinating the component strands of a chromosome so that these may act in a unified manner when outside the resting nucleus.

show abstract

Section: The Minor Spiralmentioning

confidence: 99%

“…Hosta (Takamine, 1937); Aloe (Koshy, 1937;da Camara, 1938); Tulzpa (Upcott, 1936); Hyacinthus (Naithani, 1937); Scilla (Coleman, 1940) ; Veltheimia (Coleman,I 940) ; Fritillariu (Darlington, 1935); Gateria (Coleman, 1940); Lilium (Shinke, 1930(Shinke, ,1934Kato & Iwata, 1935;Kuwada, Shinke & Oura 1938). NUY&M (Shinke, 1930).…”

mentioning

confidence: 99%

The Spiral Structure of Chromosomes

Manton¹

1950

Biological Reviews

View full text Add to dashboard Cite

show abstract

“…This probably involves a rotation of the chromosome ends as the threads stretch and lengthen. The other is the initiation and development of the maj or coils in the zygotene (and possibly the leptotene) stage (see also Koshy, 1934;Naithani, 1937). The chromatid is the unit of coiling just as it is the unit of crossing over, and as the chromatids become shorter, thicker, and more rigid, they will straighten out and release the relational coil much as in a mitotic prophase.…”

mentioning

confidence: 99%

The Behavior of Meiotic Prophase Chromosomes as Revealed Through the Use of High Temperatures

Swanson

1943

American J of Botany

View full text Add to dashboard Cite

“…In summary this is the evidence against the existence of "chromomeres" : (a) In living cells the microdissection experiment of Chambers (1924) shows that the leptotene chromosome can be stretched into a uniform thread, (b) In several plants such as Tradescantia (Kaufmann, 1931;Swanson, 1943), Alliuin and Aloe (Koshy, 1934(Koshy, , 1937, Hyacinthus (Naithani, 1937), and in the grasshopper the leptotene chromosome consists of a uniform, coiled thread, Feulgen-positive throughout its length. No evidence of interchromomeric fibrils can be found.…”

Section: Discussion Chromomeresmentioning

confidence: 99%

“…They were first described as such in Tradescantia by Kaufmann (1931), who nevertheless accepted the "chromomere" interpretation for other plants and animals (Kaufmann, 1936). Koshy (1934Koshy ( , 1937 found the leptotene chromosome to be coiled in Allium and Aloe, Naithani (1937) in Hyacinthus. Smith (1932) suggested that the beadlike appearance of the leptotene in Galtonia might be due to twists in the chromonema and Hoare (1934) noted that the zygotene threads give the impression of two tightly coiled chromonemata.…”

mentioning

confidence: 99%