Meiotic Behaviour of Pollen Mother Cells in Eight Genotypes of Pepper ( Capsicum annuum L.) under Water Deficit

2021 ◽  
Author(s):  
Yanina Arnaoudova ◽  
Boyan Arnaoudov ◽  
Nasya Tomlekova
Keyword(s):  
Capsicum Annuum ◽  
Water Deficit ◽  
Meiotic Behaviour ◽  
Pollen Mother Cells ◽  
Capsicum Annuum L ◽  
Mother Cells

Mode of bivalent formation in desynaptic mutants of chili pepper (Capsicum annuum L.)

1986 ◽  
Vol 28 (3) ◽  
pp. 335-339
Author(s):  
O. Aniel Kumar ◽  
Ramesh C. Panda ◽  
K. G. Raja Rao
Keyword(s):  
Capsicum Annuum ◽  
Binomial Distribution ◽  
Recessive Gene ◽  
Chili Pepper ◽  
Pollen Mother Cells ◽  
Capsicum Annuum L ◽  
Bivalent Formation ◽  
Mother Cells

Frequencies of pollen mother cells with different numbers of bivalents significantly deviated from that expected with a binomial distribution in Capsicum annuum desynaptic mutants controlled by a recessive gene. This pattern varied in F2 segregants.Key words: Capsicum, chili pepper, desynaptics, bivalent distribution.

Persisting demibivalents: a unique meiotic behaviour in Cuscuta babylonica Choisy

Genome ◽  
1987 ◽  
Vol 29 (1) ◽  
pp. 63-66 ◽  
Author(s):  
Batia Pazy ◽  
Uzi Plitmann
Keyword(s):  
Key Words ◽  
Chromosome Segregation ◽  
Meiotic Behaviour ◽  
Chromosome Behaviour ◽  
Chromosome Movement ◽  
Pollen Mother Cells ◽  
Key Words Meiosis ◽  
Mother Cells ◽  
Telomeric Association

Idiosyncratic chromosome behaviour during meiosis was found in pollen mother cells of Cuscuta babylonica Choisy, a thread-like holoparasitic herb. Its main features are among the following: (i) telomeric association between homologues through most stages of the process, which leads to persisting chromatid bivalents (= "demibivalents"); (ii) uncommon chromosome segregation in first and second anaphase; and (iii) prolonged intensified heterochromatinization. Although "regular" in its own way, this process leads to the formation of unviable products. Its further investigation might contribute to our understanding of the role of the spindle and chromosome movement in the ordinary process of meiosis. Key words: meiosis (abnormal), persisting demibivalents, Cuscuta babylonica.

Low glucosinolate Brassica juncea breeding line revealed to be nullisomic

Genome ◽  
2001 ◽  
Vol 44 (4) ◽  
pp. 738-741 ◽  
Author(s):  
B F Cheng ◽  
G Séguin-Swartz ◽  
D J Somers ◽  
G Rakow
Keyword(s):  
Brassica Juncea ◽  
Interspecific Cross ◽  
Meiotic Behaviour ◽  
Breeding Line ◽  
Pollen Mother Cells ◽  
Chromosomal Segregation ◽  
B Genome ◽  
Hybrid Plants ◽  
Mother Cells ◽  
Metaphase I

The low glucosinolate Brassica juncea breeding line 1058 was derived from a BC1F3 plant of an interspecific cross between high glucosinolate Indian B. juncea (genome AABB, 2n = 36) line 60143 and B. rapa (genome AA, 2n = 20) canola strain CZY. Line 60143 had 2n = 36 chromosomes (18 bivalents at metaphase I) and strain CZY had 2n = 20 chromosomes (10 bivalents). Line 1058 was nullisomic, with 2n - 2 = 34 chromosomes, with 17 bivalents formed at metaphase I and an even chromosomal segregation of 17:17 at anaphase I. In F1 hybrid plants of the cross 1058 × CZY, 98.3% of the pollen mother cells had 10 bivalents and seven univalents. This is evidence that plants of line 1058 are nullisomic, missing one pair of B-genome chromosomes.Key words: low glucosinolate mustard, meiotic behaviour, cytogenetics.

Differences in meiotic pairing induction between the A genomes of Triticum boeoticum Boiss. and T. urartu Tum. using diploid species of the subtribe Triticineae as analysers

Genome ◽  
1987 ◽  
Vol 29 (6) ◽  
pp. 891-893 ◽  
Author(s):  
H. Lucas ◽  
J. Jahier
Keyword(s):  
Interspecific Hybrids ◽  
Diploid Species ◽  
Distinct Species ◽  
The Other ◽  
Meiotic Behaviour ◽  
Meiotic Pairing ◽  
Haynaldia Villosa ◽  
Pollen Mother Cells ◽  
Triticum Boeoticum ◽  
Mother Cells

The number of associations between chromosome arms in the pollen mother cells of the hybrid Triticum boeoticum × T. urartu is similar to that in the pollen mother cells of the parental accessions. The latter two species were crossed with the following diploid species: T. tauschii, T. comosum, T. umbellulatum, and Haynaldia villosa. The meiotic behaviour of the hybrids showed that the chromosomes of T. urartu share more homology with the diploid Triticum species than do those of T. boeoticum. On the other hand, there is more pairing in the hybrid T. boeoticum × H. villosa than in T. urartu × H. villosa. These results confirm that T. boeoticum and T. urartu are distinct species. Key words: Triticineae, interspecific hybrids, meiotic behaviour, speciation.

Organ-specific defence strategies of pepper (Capsicum annuum L.) during early phase of water deficit

2010 ◽  
Vol 29 (3) ◽  
pp. 295-305 ◽  
Author(s):  
Astrid Heide Sziderics ◽  
Mouhssin Oufir ◽  
Friederike Trognitz ◽  
Dieter Kopecky ◽  
Ildikó Matušíková ◽  
...  
Keyword(s):  
Capsicum Annuum ◽  
Water Deficit ◽  
Early Phase ◽  
Capsicum Annuum L ◽  
Organ Specific ◽  
Defence Strategies

Effect of hydric stress-related acoustic emission on transcriptional and biochemical changes associated with a water deficit in Capsicum annuum L

2021 ◽  
Author(s):  
Laura Helena Caicedo-Lopez ◽  
Ramon Gerardo Guevara-Gonzalez ◽  
Juan E. Andrade ◽  
Adolfo Esquivel-Delgado ◽  
Andrés Esteban Perez-Matzumoto ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Capsicum Annuum ◽  
Water Deficit ◽  
Biochemical Changes ◽  
Capsicum Annuum L ◽  
Hydric Stress

Nucleolus organization and meiotic behaviour of B chromosomes in Hepatica nobilis

Genome ◽  
1991 ◽  
Vol 34 (6) ◽  
pp. 853-859 ◽  
Author(s):  
T. Mabuchi
Keyword(s):  
Chromosome Complement ◽  
B Chromosomes ◽  
The Other ◽  
Chromosome 7 ◽  
Meiotic Behaviour ◽  
Pollen Mother Cells ◽  
Small Satellites ◽  
C Banding ◽  
End To End ◽  
Mother Cells

The C-banding karyotype of Hepatica nobilis indicates the A chromosome complement and B chromosomes (Bs) to be banded in the terminal regions. The A chromosomes (As) of this species comprise mainly euchromatin (89.7%) and a small amount of heterochromatin (10.3%). Bs of H. nobilis have terminal centromeres at one end and possess small satellites at the other end. Bs cause an increase in the number of nucleoli per cell, with a decrease in the size of each nucleolus. During meiosis, Bs associate as bivalents and multivalents up to pentavalents. These associate loosely with the short arm of satellited chromosome 7 (end to end association) at diakinesis in some pollen mother cells. Bivalent or trivalent Bs associate with a nucleolus at diakinesis. B chromosomes of H. nobilis thus appear to contain nucleolus organizing regions and may have originated from the satellited chromosome 7 and other members of As.Key words: Hepatica, satellited B, end to end association, origin, nucleolus organizing regions.

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