Further Data on Structural Heterozygosity in a Strain of Secale Kuprijanovii

Hrishi, N.; Müntzing, Arne; Ramulu, K. Sree

doi:10.1111/j.1601-5223.1969.tb02243.x

Cited by 4 publications

(2 citation statements)

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“…These may arise spontaneously or be caused by a variety of factors including chemical or irradiation treatments. Reciprocal translocations are sources of intraspecific chromosomal structural polymorphism and have been considered as an important genetic aberration utilized by geneticists as well as plant breeders (Müntzing & Prakken 1941;Hrishi et al 1969;Candela et al 1979;Mahama et al 1999). Generally few chromosomes are involved in reciprocal translocations; however, the entire chromosome complement has also been reported to be involved in the process in Oenothera (Cleland 1972), Rhoeo spathacea (Sax 1931;Verma and Ohri 1979;Koul et al 2011), Chelidonium majus (Pilquin 1981), Pennisetum americanum (Vari and Bhowal 1991) and Allium roylei Gohil 2003, 2008;Kohli and Gohil 2011).…”

Section: Introductionmentioning

confidence: 99%

Reduction in chiasma frequency and pollen fertility due to multiple chromosomal associations and univalents inSaxifraga diversifoliafrom alpine regions of northwest Himalayas (India)

Kumar

Singhal

2013

Caryologia

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Two varieties of Saxifraga diversifolia, diversifolia and parnassifolia, collected from the moist alpine slopes around Gauri Kund, 3930 m (Manimahesh Hills, Himachal Pradesh, India), are studied for detailed male meiosis, chiasma frequency and pollen fertility. Both varieties exist at diploid level (based on x = 8), and show a meiotic chromosome count of n = 8 at diakinesis and metaphase-I, and regular chromosome distributions at anaphases-I/II. The meiotic chromosome count of n = 8 ascertained here represents a new aneuploid cytotype, supplementing the earlier report of a diploid cytotype with 2n = 20 from the northwest Himalayas in India and the Nepal Himalayas. Of the two varieties, var. diversifolia showed the presence of multiple chromosomal associations and univalent chromosomes at diakinesis and metaphase-I of meiosis-I. On the other hand, var. parnassifolia does not have multivalent formation but showed only 2-4 univalent chromosomes at diakinesis and metaphase-I. Occurrence of univalents in pollen mother cells of var. diversifolia and parnassifolia reduced the chiasma frequency significantly and also caused some pollen sterility (7-8%). The paper herein discusses for the first time the occurrence of structural heterozygosity and univalent chromosomes and their apparent affect on chiasma frequency and pollen fertility in S. diversifolia.

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Section: Introductionmentioning

confidence: 99%

Reduction in chiasma frequency and pollen fertility due to multiple chromosomal associations and univalents inSaxifraga diversifoliafrom alpine regions of northwest Himalayas (India)

Kumar

Singhal

2013

Caryologia

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“…The phenomenon of structural heterozygosity for reciprocal translocations is regarded as a source of structural polymorphism of chromosomes and, served as excellent cytogenetic tools and are being utilized in breeding different crops by geneticists and plant breeders (Müntzing and Prakhen 1941, Hrishi et al 1969, Mahama et al 1999, Auger and Birchler 2002. The reciprocal translocation is the most frequent type of chromosome mutations in crop plants Newhouse 1982, Singh 2003).…”

Section: Discussionmentioning

confidence: 99%

Impact of Structural Heterozygosity on Pollen Fertility and Chiasma Frequency in <i>Leontopodium jacotianum</i> from the Cold Deserts of Ladakh (Jammu and Kashmir), India

et al. 2019

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Meiotic studies have been carried out on three plants of Leontopodium jacotianum from Cold deserts of Ladakh. The chromosome number of n=24 counted in all the plants adds a new tetraploid cytotype for the species. The plants collected from Zoji-La showed a normal meiotic course leading to high pollen fertility. However, the plants collected from Sankoo region of cold deserts of Ladakh, Jammu, and Kashmir showed abnormal meiosis caused by structural heterozygosity for reciprocal translocations. The structural heterozygosity was observed for the first time in the species. Chiasma frequency was also calculated by using one-way analysis of variance (ANOVA) in the plants to see the effect of reciprocal translocations. Besides reciprocal translocation, the plant also showed various meiotic abnormalities in the form of early disjunction of bivalents, chromatin bridges, and laggards. Structural heterozygosity and other meiotic abnormalities in the plant seem to be responsible for a reduction in pollen fertility.

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