Significance of Chromosome Numbers in Charophyta — A Discussion

Sarma, Y. S. R. K.; Ramjee,

doi:10.1080/00087114.1971.10796447

Caryologia

1971

DOI: 10.1080/00087114.1971.10796447

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Significance of Chromosome Numbers in Charophyta — A Discussion

Y. S. R. K. Sarma

Ramjee Ramjee

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1973

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Cited by 16 publications

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References 7 publications

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“…Chromosome number studied in the four species confirmed the previous reports. Many workers reported 7 as the basic chromosome number for the genus Chara and 6 for the genus Nitella (Khan and Sarma 1967, Sinha and Verma 1970, Sarma and Ramjee 1971, Noor and Mukharjee 1977, Chartterjee 1979. The present findings also confirms above reports but many a times more than 7 in Chara spp.…”

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Karyotype of some species of Chara and Nitella (Charophyta) from Bangladesh

1970

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Karyotypic analysis of Chara corallina Linn., C. vulgaris Linn., C. gymnopitys Linn. and Nitella translucens Ag. collected from natural habitats revealed that C. corallina has n=42, C. vulgaris and Chara gymnopitys have n=14 while Nitella translucens has n=18 chromosomes. All the species had differences in individual chromosome length, total chromatin length, total frequency between the complements of their chromosomes. Cytological investigation on the chromosome number in members of charophyta from India have been made in the last several decades (Noor 1969, Noor and Mukherjee 1977, Khan and Sarma 1967, Sinha and Verma 1970.It has been reported that the chromosomes of algae are predominatly like that of the higher plants and most of the green algae possess localized centromeres as do most of the higher plants (Nagl and Furening 1979). In the present study, an attempt has been made to report the chromosome number and their morphology because so far no such work has been done in Bangladesh.Chara corallina Linn., Chara vulgaris Linn., Chara gymnopitys Linn. and Nitella translucens Ag. were collected from different places in Rajshahi district, Bangladesh. These species were identified based on monographs by Paul et al. (1960) and the British Charophyta by Groves and Webster (1920). Antheridial filaments were the most favourable material for cytological study. Green tips with prominent sex organs were collected and fixed in 1:1 aceto-alcohol solution for 24-48 hours and then transferred to 70% ethanol. During cytological investigation Godward's (1948) iron-alum acetocarmine method was applied with slight modification. Sometimes for clear staining 1% haematoxylin was used instead of acetocarmine. Squashing and light tapping were carried out for better spreading of metaphase chromosomes in one plane. The number of chromosomes for each of algal species were counted and length of chromosomes with respect to the centromeric position were measured from camera lucida drawings. From the total chromatin length (TCL), TF% and coefficient of variation (CV) among the chromosome complement were computed statistically by conventional methods to characterize each of four karyotypes of the Charophytes.

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Karyotype of some species of Chara and Nitella (Charophyta) from Bangladesh

1970

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“…Wood and Imahori (1965), while bringing up their Monograph and Iconograph on 'A Revision of the Characeae', considered that the sexual dimorphism reflects minor genetic variations and the dioecious taxa always possess half the chromosome number of its monoecious counterparts. This interpretation of Wood and Imahori (1965) was not supported by Sarma and Khan (1967), Sarma and Ramjee (1971), Sawa (1965), Proctor and Hotchkiss (1968); Ramjee and Bhatnagar (1978) and Bhatnagar (1981) on cytological grounds. Present paper deals with the correlation between polyploidy and sexual dimorphism in Charophyta.…”

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Polyploidy in relation to sexual dimorphism in Charophyta.

Bhatnagar¹

1989

CYTOLOGIA

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Cytotaxonomic Studies onNitella FurcataSubsp.FlagelliferaF.PatulaGr. Ex Allen and Comparison with Other Taxa ofN. FurcataComplex

Ramjee

Bhatnagar

1978

Caryologia

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Significance of Chromosome Numbers in Charophyta — A Discussion

Cited by 16 publications

References 7 publications

Karyotype of some species of <i>Chara</i> and <i>Nitella</i> (Charophyta) from Bangladesh

Karyotype of some species of <i>Chara</i> and <i>Nitella</i> (Charophyta) from Bangladesh

Polyploidy in relation to sexual dimorphism in Charophyta.

Cytotaxonomic Studies onNitella FurcataSubsp.FlagelliferaF.PatulaGr. Ex Allen and Comparison with Other Taxa ofN. FurcataComplex

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