Results 31 to 40 of about 30,580 (249)

Microsporogenesis associated with seed yield in Urochloa sexual polyploid hybrids

Crop Breeding and Applied Biotechnology, 2021
High seed yield is a fundamental characteristic of apomictic and sexual hybrids of the genus Urochloa P. Beauv. (syn. Brachiaria (Trin.) Griseb.).
Andréa Beatriz Diverio Mendes, Celina de Medeiros Ragalzi, Rosangela Maria Simeão, Jaqueline Rosimeire Verzignassi, Cacilda Borges do Valle, Maria de Fatima Pires da Silva Machado   +5 more
doaj  

Meiotic irregularities associated to cytomixis in Buddleja iresinoides (Griseb.) Hosseus. (Buddlejaceae) and Castilleja arvensis Schltdl. & Cham. (Orobanchaceae)

Caryologia, 2019
The current paper analyzes the male meiotic behavior in wild populations of Buddleja iresinoides and Castilleja arvensis from Piedmont areas of the Northwest Region of Argentina. Castilleja arvensis showed tetraploid number of chromosome of 2n = 24.
Aldo Ruben Andrada, Valeria de los Ángeles Páez, M.S. Caro, P. Kumar   +3 more
doaj   +1 more source

Chromosomal abnormalities predisposing to infertility, testing, and management: a narrative review

Bulletin of the National Research Centre, 2021
Background Much interest has not been placed on the role of chromosomal abnormalities in the pathogenesis and rising prevalence of infertility in recent times.
Tajudeen O. Yahaya, Esther O. Oladele, Daniel Anyebe, Chidiebere Obi, M. D. A. Bunza, Ridwan Sulaiman, Usman U. Liman   +6 more
doaj   +1 more source

Primordial follicular assembly in humans : revisited [PDF]

, 2009
Peer ...
A. Maheshwari, Baker, Donovan, Gumienny, Konishi, P. A. Fowler, Pinkerton, Satoh, Vaskivuo   +8 more
core   +1 more source

Preimplantation genetic diagnosis in patients with male meiotic abnormalities

Reproductive BioMedicine Online, 2004
Indications and candidates for preimplantation genetic diagnosis (PGD) have increased in recent years. This study evaluates whether IVF-intracytoplasmic sperm injection (ICSI) results could be improved by selecting embryos through PGD-AS (aneuploidy screening) in couples in whom the male partner presents meiotic abnormalities. Two hundred and fifty-six
B, Aran, A, Veiga, F, Vidal, M, Parriego, J M, Vendrell, J, Santaló, J, Egozcue, P N, Barri   +7 more
openaire   +2 more sources

Reproductive Isolation Between Taxonomically Controversial Forms of the Gray Voles (Microtus, Rodentia; Arvicolinae): Cytological Mechanisms and Taxonomical Implications

Frontiers in Genetics, 2021
The formation of hybrid sterility is an important stage of speciation. The voles of the genus Microtus, which is the most speciose genus of rodents, provide a good model for studying the cytological mechanisms of hybrid sterility.
Tatiana I. Bikchurina, Tatiana I. Bikchurina, Fedor N. Golenishchev, Elena A. Kizilova, Elena A. Kizilova, Ahmad Mahmoudi, Pavel M. Borodin, Pavel M. Borodin   +7 more
doaj   +1 more source

Tubulins in C. elegans [PDF]

, 2018
The C. elegans tubulin family is composed of nine α-, six β-, and one γ-tubulin. Tubulins are highly conserved, functioning as α-β heterodimers that assemble into microtubules.
Hurd, Daryl D.
core   +2 more sources

Meiotic behavior during microsporogenesis, responsible for male sterility in some species of Salvia sect. Aethiopis in Iran

Caryologia
The genus Salvia L. (Lamiaceae: tribe Mentheae) contains about 1000 species. Section Aethiopis in this genus has a distribution in the Mediterranean and central Asia and contains about 34 species in Iran.
Fatemeh Hajmoradi
doaj   +1 more source

Cytological analysis for meiotic patterns in wild rice (Oryza rufipogon Griff.)

Biotechnology Reports, 2017
The present report explores the chromosomal patterns during meiosis as a fundamental cell division study in wild rice (Oryza rufipogon Griff.). Cytological assays revealed normal meiosis in most cases but in some instances meiotic abnormalities such as ...
Sutanu Sarkar, Somnath Bhattacharyya, Saikat Gantait   +2 more
doaj   +1 more source

Seed ageing and meiotic chromosomal abnormalities in lettuce.

CYTOLOGIA, 1989
Meiotic chromosomal abnormalities observed in lettuce plants grown from aged seeds increased with the decrease in the viability of the seed lot. Univalents, fragments and a few cases of precocious segregation were observed in metaphase I. Abnormalities found at anaphase I and anaphase II included dicentric bridges with or without fragments, acentric ...
N. K. Rao, E. H. Roberts
openaire   +2 more sources