The Structure and Meiotic Behavior of the Differentiated Chromosomes of Tomato

Brown, Stephen P. A.

doi:10.1093/genetics/34.4.437

Cited by 110 publications

(3 citation statements)

References 12 publications

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“…Similarly, LESLEY (1937), BROWN (1949), and BARTON 5 ) . The number of RNs on SCs in heterochromatin appears somewhat greater in the histograms (Figure 12) and APPENDIX than was actually observed (Table 6).…”

Section: Resultsmentioning

confidence: 96%

Two-dimensional spreads of synaptonemal complexes from solanaceous plants. VI. High-resolution recombination nodule map for tomato (Lycopersicon esculentum).

Sherman¹,

Stack²

1995

Genetics

178

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We have produced a high-resolution physical recombination map for tomato chromosomes by determining the frequency and distribution of recombination nodules (RNs) on tomato synaptonemal complexes (SCs). We present evidence that there is a 1:1 relationship between RNs and chiasmata. Every SC has at least one RN. There are no RNs at the ends of SCs, in kinetochores, or in the heterochromatic short arm of SC 2 that carries the nucleolus organizer. RNs are more common per unit length of SC in euchromatin compared with SC in heterochromatin . The average number of RNs per SC and the average number of RNs per SC arm are directly correlated with the length of SC in euchromatin. When SCs have only one RN, that RN occurs on the long arm more frequently than predicted based on SC arm length. Patterns of multiple Rns on SCs indicate RN (crossover) interference. Rns probably can occur anywhere on SCs in euchromatin, but RNs are not distributed randomly along SCs in euchromatin or in heterochromatin. The lengths of tomato's physical recombination (RN) map, classical genetic linkage map, and molecular linkage map all differ from each other for a variety of reasons.

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Section: Resultsmentioning

confidence: 96%

Two-dimensional spreads of synaptonemal complexes from solanaceous plants. VI. High-resolution recombination nodule map for tomato (Lycopersicon esculentum).

Sherman¹,

Stack²

1995

Genetics

178

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show abstract

“…Treated and untreated seeds were germinated. Root tips were cut off and fixed in Carnoy's solution (6 ethyl alcohol +3 chlorofrom +1 acetic acid glacial) and investigated with usual acetocarmine squash technique, Brown (1949). Five preparation from each treatment were examined to determine the:-1.…”

Section: Methodsmentioning

confidence: 99%

Cytological Effect of Gamma Irradiation on Mitotic Activity on Vicia Faba Plants.

Mahmoud

2000

Journal of Plant Production

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The present study was carried to investigate the cytological effects of six doses of gamma rays (1,2,3,4,5 K.rad and fractionated does (1 K.rad/24hrs for 5 days) in root meristems of Vicia faba plant. The data of the present study revealed that all radiation treatments reduced mitotic index and increased total chromosomal abnormalities. The most common of them were: stickness, laggards, bridges, micronulei, multinuclei, disturbed, c-metaphase, splitprophase, chromosome ring,tripolar and tetrpolar. The results also illustreed that There was a negative correlation between radiation dose and mitotic index but there was a positive correlation between radiation dose and total chromosomel abnormalities.Fractionated dose (1 K.rad/24hrs for 5 days had effects on mitotic index and total chromosomal abnormalities less than dose 3,4and 5 K.rad but it had intermediate effects between two dose 2 and 3 K.rad.

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“…Yes, I suggest, there could be, and it might come out of the coiling hypothesis of the nature of chromomeres. Brown (1949) suggested that the chromomeres of tomato are formed in light-staining regions and move medianly during pachy-IQ"^!] BUSEYâ€" SORGHUM PACHYTENE KARYOTYPES 255 ^tene.…”

Section: ]mentioning

confidence: 99%

Sorghum Pachytene Karyotypes

Busey¹

1971

Annals of the Missouri Botanical Garden

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Sorghum [S. bicolor (L.) Moench] pachytene chromosomes show considerahle detail in morphology. Previous reports have characterized karyotypes. In the present study, karyological observations covered a wide range of sorghum germplasm. Most collections were found unsatisfactory for karyotype analysis. Of those which were satisfactory, cxliaustive simultaneous comparisons of chromosome lengths, arm ratios, and other morpholog)' could not estal)lish any complete karyotypes. Of the ten chromosome pairs, however, one nucleolar pair and asymmetric pair were easily identified, A group of three longer pairs could be distinguished from five shorter pairs. Beyond this, it did not seem that complete kar>*otypcs could ever be obtained, in view of the large lengtli variation computed for the two identifiable chromosomes. This variation could not be entirely assigned to hypotheses of chrouiosome shortening or to any feature of the technique, though each step of the technique was analyzed for its reliability. Tlie nonconformity of the present results from those of previous reports challenges the repeatability of the previous experiments. This, in line with statements by some sorghum workers, suggests that the basic karyology of sorghum is not well understood.

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The Structure and Meiotic Behavior of the Differentiated Chromosomes of Tomato

Cited by 110 publications

References 12 publications

Two-dimensional spreads of synaptonemal complexes from solanaceous plants. VI. High-resolution recombination nodule map for tomato (Lycopersicon esculentum).

Two-dimensional spreads of synaptonemal complexes from solanaceous plants. VI. High-resolution recombination nodule map for tomato (Lycopersicon esculentum).

Cytological Effect of Gamma Irradiation on Mitotic Activity on Vicia Faba Plants.

Sorghum Pachytene Karyotypes

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