Cytogenetic Evidence for Long Continued Stability in the Genus Plantago

Day, A.M.

doi:10.2307/2406604

Cited by 34 publications

(50 citation statements)

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“…The two sets of this karyotype therefore may be designated as two separate genomes and this sample may be allopolyploid. The diploid number of 2n=8 recorded in sample 1 agrees with a number of counts for this species (McCullagh 1934, Rahn 1966, Stebbins and Day 1967. No poly ploid counts were recorded from other parts of the world, but Badr (1980) found 2n=16 in plants from Egypt.…”

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confidence: 80%

Chromosomal studies in the Egyptian flora. II. Karyotype studies in the genus Plantaga L.

Badr

El-Kholy

1987

CYTOLOGIA

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The first reliable chromosome counts in species of the genus Plantago L. was made by McCullagh (1934). Later more detailed cytological investigations were carried out on more than half of the species in this genus. Some of these investigations were made in connection with taxonomic studies in order to elucidate the relationships in particular groups of related species (Bocher et al. 1955, Rahn 1957, Cartier 1971, 1973, Sopova and Rizova 1975, Zemskova 1977. Other studies were concerned with investigating the cytology of Plantago species in certain floras or phytogeographic regions (Gregor 1939, Runemark 1967, Briggs 1973, Favarger and Vasudevan 1972, Fernandes and Franca 1973.The cytology of the genus Plantago in Egypt has not been a subject of a study. The chro mosome number of only three species was reported by Badr (1980). The numbers of some other species which grow in Egypt are also known from chromosome counts in plants from near floras particularly that of Europe. The present study is therefore conducted to investigate the cyto logical features in species of the genus Plantago from Egypt. This investigation deals not only with chromosome numbers but also with detailed karyotype features such as chromosome length and centromere position. The impact of karyotype features in the taxonomic relationships of the studied species is also elucidated. Materials and methodsMaterials of 12 samples belonging to 10 different species of Plantago were collected from their natural habitats. The studied species and the localities from which they were collected are given in Table 1. The distribution of localities in the country is illustrated in the map (Fig. 1).Cytological preparations were carried out on root tips obtained from seeds germinated on moist filter paper in petri dishes. Root tips were pretreated with 0.05% colchicine solution for 4 hours and fixed in 3:1 (V/V) ethanol: glacial acetic acid. Squash preparations were made using the Feulgen squash technique and were made permanent by mounting in canada balsam. Cells with good spreading of chromosomes were photographed and prints were enlarged to a magnification of 3000 times. Comparisons of chromosomes of the species studied were made by constructing a karyotype for each species by arranging the chromosomes in homologous pairs in order of their length and arm ratio as measured from the photographic prints. The variation in the chromosome length and arm ratio within the karyotype has been expressed by calculating the standard error (SE) of these parameters.

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confidence: 80%

Chromosomal studies in the Egyptian flora. II. Karyotype studies in the genus Plantaga L.

Badr

El-Kholy

1987

CYTOLOGIA

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“…At meiotic prophase, the chromocentres started to be distributed at various positions along the auto somes. In some chromosomes, they were resolved into a string of chromomeres larger than normal chromomeres, a condition similar to that found in the meiotic prophase of Plantago insularis (Stebbins and Day 1967). In such a case, the hetero chromatic regions of the homologous chromosomes synapse completely at the pachy tene stage behaving like the euchromatin.…”

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confidence: 58%

“…On the basis of com parative studies of their distribution near the centromere, Stebbins (1971) showed that chromocentres and similar concentrations may have considerable evolutionary value. For example, Hordeum vulgare and Plantago ovata are specialized annuals which contain well marked chromocentres.…”

Section: Discussionmentioning

confidence: 99%

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Heterochromatin in Anthers of <i>Reseda arabica</i>

El-Bayoumi

1975

CYTOLOGIA

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“…It grows in arid and semi-arid sandy temperate regions of western India, mainly in the states of Gujarat and Rajasthan 19 . Its natural habitat is in the Mediterranean region of southern Europe and North Africa, Middle East, central Asia and southern Russia 20 . Excess of metals in the soil affects plant metabolism and plants have evolved different mechanisms to cope with it.…”

Section: Introductionmentioning

confidence: 99%

Blood chemistry profile of Bali cattle fed silage rice straw and biosupplement of selected rumen and termites lignocellulolytic bacteria consortium

2017

JCBSC

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Cytogenetic Evidence for Long Continued Stability in the Genus Plantago

Cited by 34 publications

References 0 publications

Chromosomal studies in the Egyptian flora. II. Karyotype studies in the genus Plantaga L.

Chromosomal studies in the Egyptian flora. II. Karyotype studies in the genus Plantaga L.

Heterochromatin in Anthers of <i>Reseda arabica</i>

Blood chemistry profile of Bali cattle fed silage rice straw and biosupplement of selected rumen and termites lignocellulolytic bacteria consortium

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