The Morphology of Somatic Chromosomes in Lilium

Stewart, R. N.

doi:10.2307/2437190

Cited by 49 publications

(53 citation statements)

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“…Based on the GISH results and according to Stuart (1947) and Lim et al (2000Lim et al ( , 2001a, chromosome classification and karyotypes were made.…”

Section: Chromosome Classification and Karyotypingmentioning

confidence: 99%

Genome composition of triploid lily cultivars derived from sexual polyploidization of Longiflorum × Asiatic hybrids (Lilium)

Zhou

Ramanna²,

Visser³

et al. 2007

Euphytica

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About 19 cultivars, which had originated from backcrosses between F1 LA (Longiflorum · Asiatic) hybrids (2n = 2x = 24) as female parents and Asiatic cultivars as male parents (2n = 2x = 24), were analyzed with genomic in situ hybridization. 17 of them were triploid (2n = 3x = 36), and two aneuploid (2n = 3x + 1 = 37). The triploid cultivars had resulted from the functional 2n eggs produced by the female parents (F1 hybrids) because first division restitution (FDR) occurred in their meiosis during megasporogenesis. Similarly, the aneuploid cultivars had originated from viable 2n + 1 eggs. The extra chromosome in cultivar 041555 or 041572 resulted from one univalent or one half-bivalent which might have lagged behind when the sister chromatids of the other univalents and half-bivalents were segregating during the FDR process in their LA hybrid parents, respectively. That the majority of cultivars possessed recombinant chromosomes showed that intergenomic recombination might play an important role during the selection of the cultivars directly from BC1 progenies. That five cultivars of the 15 recombinant cultivars only had reciprocal recombinant chromosomes and 10 cultivars had non-reciprocal recombinant chromosomes indicates that the latter are more important. Because 9 of the 10 non-reciprocal recombinant cultivars possessed substitutions for recombinant segments, it also indicated that such substitutions could be an important source for the genetic variation in the sexual triploid BC1 progenies. In such cases there was a potential for the expression of the recessive genes of the backcross parent in a nulliplex (aaa) condition in the substituted segments. Genetic variation resulting from such nulliplex loci might have played a role in the selection of some of the cultivars.

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“…Based on the GISH results and according to Stuart (1947) and Lim et al (2000Lim et al ( , 2001a, chromosome classification and karyotypes were made.…”

Section: Chromosome Classification and Karyotypingmentioning

confidence: 99%

Genome composition of triploid lily cultivars derived from sexual polyploidization of Longiflorum × Asiatic hybrids (Lilium)

Zhou

Ramanna²,

Visser³

et al. 2007

Euphytica

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show abstract

“…The number, position and activity of the secondary constriction was also found to be variable. B-chromosomes too were observed in a number of species (Stewart 1943(Stewart , 1947. Polyploidy is very rare in the genus and is reported in nature only in L. tigrinum (Darlington and Janaki-Ammal 1945).…”

mentioning

confidence: 99%

“…Mehra and Kachroo (1951) who studied chromosome morphology in some Lilium species also arrived at the same conclusion. Apart from polyploids, the occurrence of aneuploids has also been reported (Stewart 1943). Fritillaria L. Five species of this genus are met with in the W. Himalayas.…”

mentioning

confidence: 99%

Cytological Observations on some W. Himalayan Monocots

Mehra

Sachdeva

1976

CYTOLOGIA

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“…The occurrence of six chromosomse with secondary constrictions in di ploids and twelve in hexaploids indicates that along with polyploidy, there have been structural changes in chromosomes as well, possibly associated with hybridi sation. Such a uniformity in chromosome number, with minute difference in karyo type principally involving the secondary constriction region, finds parallel to some extent in the genus Lilium of monocotyledons (Stewart 1947, Sen 1978. A feature worthnoting in the karyotypes of Magnolia grandiflora and M. lili flora is the overall chromosome size.…”

Section: Methodsmentioning

confidence: 90%