1988
DOI: 10.1508/cytologia.53.763
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The mechanism of 2n pollen formation in diploids of Costus speciosus (Koenig) J.E. Smith and role of sexual polyploidization in the origin of intraspecific chromosomal races.

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Cited by 11 publications
(8 citation statements)
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“…This phenomenon is known from other taxa and reflects the increased size of nuclei containing extra sets of chromosomes (Bretagnolle and Thompson, 1995). The size ratio of reduced and unreduced pollen in A. borealis (B1:1.42) is similar to that reported in other species (Tyagi, 1988;Orjeda et al, 1990), suggesting a general guideline for screening unreduced pollen. However, reduced and unreduced pollen sometimes lack clearcut size differences in grasses and other wind-pollinated species (Li et al, 1964;Maciera et al, 1992).…”
Section: Discussionsupporting
confidence: 77%
“…This phenomenon is known from other taxa and reflects the increased size of nuclei containing extra sets of chromosomes (Bretagnolle and Thompson, 1995). The size ratio of reduced and unreduced pollen in A. borealis (B1:1.42) is similar to that reported in other species (Tyagi, 1988;Orjeda et al, 1990), suggesting a general guideline for screening unreduced pollen. However, reduced and unreduced pollen sometimes lack clearcut size differences in grasses and other wind-pollinated species (Li et al, 1964;Maciera et al, 1992).…”
Section: Discussionsupporting
confidence: 77%
“…There is, however, strong circumstantial evidence that 2n gametes are often involved in polyploid formation. The parents of spontaneous polyploids have, upon cytological analysis, commonly been found to produce 2n gametes (18,21,24,46,52,55,83,90,94,101,166,168,173). Conversely, plants known to produce 2n gametes can be crossed to produce new polyploids (18,37,81,136,138).…”
Section: Mechanisms Of Polyploid Formationmentioning
confidence: 99%
“…Although all the steps in this pathway have rarely been observed in their entirety, the individual mechanisms are well substantiated. Triploids have often been observed in diploid populations (41,47,69,143,168), and it is generally believed that these are produced by the union of reduced (n) and unreduced (2n) gametes. Studies of such spontaneous triploids, as well as triploids produced by crossing diploids and tetraploids, indicate that many of the gametes produced by autotriploids are not functional, because they possess aneuploid, unbalanced chromosome numbers.…”
Section: Pathways Of Polyploid Formationmentioning
confidence: 99%
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