Genotypic control of chromosome behaviour in rye X. Chromosome pairing and fertility in autotetraploids

Hazarika, Manjil; Rees, H.

doi:10.1038/hdy.1967.44

Cited by 98 publications

(84 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In view of the already high bivalent frequency of normal autotetraploids in rye it is surprising that a selection for improved fertility is achieved by increasing the multivalent (quadrivalent) frequency (Hazarika and Rees, 1967). The same is true for Lolium (Crowley and Rees, 1968).…”

Section: Discussionmentioning

confidence: 96%

See 1 more Smart Citation

A pairing restriction at pachytene upon multivalent formation in autotetraploids

Timmis

Rees

1971

Heredity

Self Cite

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 96%

“…The four autotetraploids used were those produced by Hazarika and Rees (1967). They are derived from four inbred, homozygous lines P1, P8, P12 and P13 (see Rees, 1955).…”

Section: Methodsmentioning

confidence: 99%

A pairing restriction at pachytene upon multivalent formation in autotetraploids

Timmis

Rees

1971

Heredity

Self Cite

View full text Add to dashboard Cite

“…It can also be concluded that these differences originate from the differences of genotypes of the parent materials and possibly the different environment. Various researchers have reported the effects of environment (Dowrick 1957;Jam 1957;Elliott 1958;Moore 1963;Hossain 1978) and genotype on the level of bivalent association in autotetraploids of some species and allotetraploids between Lolium and Festuca (Rees 1961;Hazarika & Rees 1967;Bréese et al 1981).…”

Section: Discussionmentioning

confidence: 99%

Meiotic behaviour in reciprocal tetraploid hybrids between perennial and Italian ryegrasses

Deniz

Doğru

2008

New Zealand Journal of Agricultural Research

View full text Add to dashboard Cite

Chromosome associations and chiasma frequencies at first metaphase (MI) were studied in allotetraploid reciprocal hybrids between perennial ryegrass (Lolium perenne, Lp) and Italian ryegrass (L. multiflorum, Lm), and parent autotetraploid perennial ryegrass. Preferential chromosome pairings were assessed in Lp x Lm and Lm x Lp hybrids. The reciprocal hybrids were found to have significantly higher frequencies of bivalent pairing and lower frequencies of quadrivalent pairing and chiasmata. The mean frequencies of total bivalents at MI were 6.820, 9.885 and 10.040 and total quadrivalent frequencies were 3.320, 1.775 and 1.760 in the autotetraploid parent and the Lp x Lm and Lm x Lp hybrids, respectively. The frequencies of chiasmata were 25.075, 23.455 and 23.315 in the parent and the Lp × Lm and Lm × Lp hybrids, respectively. The frequencies of preferential chromosome pairing in the Lp × Lm and Lm × Lp hybrids were 42.69 and 44.85%, respectively and the results indicate a significant degree of preferential bivalent association in the hybrids. An inverse relationship was found between the frequency of total bivalent and quadrivalent associations in the parent and the Lp x Lm and Lm x Lp hybrids. These reciprocal hybrids are potentially important breeding materials for developing new hybrid cultivars.

show abstract

“…Lagging chromosomes, ir regular segregation or non-disjunction may also be the causative agents (Kostoff 1940, Beasly 1940, Thompson 1961. Hazarika and Rees (1967) reported that univalents and multivalents due to segregational errors lower the fertility in autotetraploids. Singh (1979) in Portulaca grandiflora holds the view that higher pollen sterility and variation in number of spores per sporad may have resulted from disturbed meiosis in C1 which is evident by unequal separation of chromosomes at anaphase I and stray bivalent at metaphase I.…”

Section: Observationsmentioning

confidence: 99%

Induced colchiploidy in Petunia hybrida Hort. Morphocytogenetical studies.

Singh

Roy

1988

CYTOLOGIA

View full text Add to dashboard Cite

Increase in the productivity or improvement in the quality of a plant by the use of fertilizers has limitations while these aspects can be achieved with greater assertion and to a long range advantage by genetical means. Of these the application of the methods of selection, hybridi zation and polyploidy had been most fruitful in bringing about all round betterment in many cases of agricultural, horticultural or even wild plants. Petunia hybrida Hort. is a common ornamental plants grown for its beautiful flowers which range in colur from white to deep red or purple (Bailey 1958). With the increase of the ploidy level all or most of these can be achieved although they may be associated with some disadvantage such as poor seed setting. However, reduce seed setting or such disabilities may assume lesser importance in this orna mental because the plant has too many seeds per capsule. In the present experiment, P. hybrida (pink) has been selected to induce autoploidy to observe the following objectives: Lengthening of flowering period, increasing the colour diversity and improving the size and keeping quality of flowers. Materials and methodsThe seeds of Petunia hybrida Hort. (pink) Vilm. has been utilized in the present study and collected from the plants grown for several successive generations in the botanical graden of the university. Tested for their diploid character and normal feature of meiosis. The col chicine treatment was applied on apical portion of the plant (See Singh and Roy 1984).After treatment, the dimension of the plant parts changed and these were documented after measuring the plant height, internodal length, leaf (L/W), stomatal size, flower size and seed setting (Average of 10 plants in each case).For meiotic studies, flower buds of different treatment plants were fixed in acetic-alcohol (1:3) with a few drop of ferric chloride in it to improve staining. Squashes were made per manent by t-butyl alcohol schedule.Heating the pollen grains in a drop of 1% acetocarmine solution, those which suitably stained were taken as fertile and the empty shrunken ones as sterile. Fertility percentage was scored on the average of 200 pollen grains. ObservationsVarious concentration of colchicine (0.20-0.50%) was applied on the apical bud and the 0.25% concentration was found effective in inducing the maximum number of tetraploid plants. Out of thirty plants were treated with above solution, 63.33% plants were survived and only 30% turned out as tetraploid (Table 1). Seeds obtained from induced tetraploids by selfing were sown in the field and plants of C2 generation were also found to be tetraploid on being cytologically investigated. Observations on induced autotetraploidy in P. hybrida was extended over first (C1) and second (C2) generation using suitable parameters.

show abstract

Genotypic control of chromosome behaviour in rye X. Chromosome pairing and fertility in autotetraploids

Cited by 98 publications

References 16 publications

A pairing restriction at pachytene upon multivalent formation in autotetraploids

A pairing restriction at pachytene upon multivalent formation in autotetraploids

Meiotic behaviour in reciprocal tetraploid hybrids between perennial and Italian ryegrasses

Induced colchiploidy in Petunia hybrida Hort. Morphocytogenetical studies.

Contact Info

Product

Resources

About