Chromosome pairing and the meiotic behaviour of univalents in the synaptic mutants of pearl millet, Pennisetum americanum (L.) Leeke (gramineae)

Genetica ◽  
1980 ◽  
Vol 54 (2) ◽  
pp. 191-195 ◽  
Author(s):  
P. R. K. Koduru
Keyword(s):  
Pearl Millet ◽  
Chromosome Pairing ◽  
Meiotic Behaviour ◽  
Pennisetum Americanum

The effect of trisomy on meiotic behaviour of interchange complexes in pearl millet, Pennisetum americanum (L.) leeke

1982 ◽  
Vol 61 (4) ◽  
pp. 333-336 ◽  
Author(s):  
K. V. Lakshmi ◽  
P. R. K. Koduru ◽  
T. G. K. Murthy ◽  
M. Krishna Rao
Keyword(s):  
Pearl Millet ◽  
Meiotic Behaviour ◽  
Pennisetum Americanum

CHROMOSOME RELATIONSHIPS BETWEEN THE CULTIVATED OAT AVENA SATIVA (6x) AND A. VENTRICOSA (2x)

1970 ◽  
Vol 12 (1) ◽  
pp. 36-43 ◽  
Author(s):  
Hugh Thomas
Keyword(s):  
Chromosome Pairing ◽  
Avena Sativa ◽  
Diploid Species ◽  
Meiotic Behaviour ◽  
Hexaploid Species ◽  
C Genome

Chromosome pairing in the F1 hybrid between the cultivated oat Avena sativa and a diploid species A. ventricosa, and in the derived amphiploid, shows that the diploid species is related to one of the genomes of the hexaploid species. The amount of chromosome pairing observed in complex interamphiploid hybrids demonstrates further that A. ventricosa is related to the C. genome of A. sativa. However, the chromosomes of the diploid species have become differentiated from that of the C genome of A. sativa and this is readily apparent in the meiotic behaviour of both the F1 hybrid and the amphiploid.

scholarly journals METAPHASE I ORIENTATION OF CHAIN-FORMING INTERCHANGE QUADRIVALENTS: A THEORETICAL CONSIDERATION

Genetics ◽  
1984 ◽  
Vol 108 (3) ◽  
pp. 707-718
Author(s):  
Prasad R K Koduru
Keyword(s):  
Pearl Millet ◽  
Theoretical Consideration ◽  
Pennisetum Americanum ◽  
Orientation Behavior ◽  
The Third ◽  
A Chain ◽  
Metaphase I

ABSTRACT The orientation behavior of chain forming interchange quadrivalents at metaphase I was studied in three interchange heterozygotes of pearl millet [Pennisetum americanum (L.) Leeke] which involve chromosomes 1, 3, 6 and 7 in various combinations. Of these, two combinations predominantly produced rings and the third was a chain-forming type. The chain quadrivalents derived from the two ring-forming interchanges, as well as the chain quadrivalent generated by the third interchange, all showed one adjacent orientation at metaphase I (adjacent-1 or -2, depending upon the formation or failure of chiasmata and their positions in the different segments of the pachytene cross). Homologous centromere co-orientation leading to adjacent-1 and alternate-1 occurs following chiasma failure in the noncentric arms of the pachytene cross, and nonhomologous centromere co-orientation leading to adjacent-2 and alternate-2 occurs following chiasma failure in the centric arms of the pachytene cross. Thus, it has been proposed that, unlike in ring quadrivalents, a specific chain quadrivalent will have only homologous or nonhomologous centromere co-orientations at metaphase I.

Meiotic behaviour of induced autotetraploids in Triticum L.

Genome ◽  
1990 ◽  
Vol 33 (2) ◽  
pp. 302-307 ◽  
Author(s):  
Yang Yen ◽  
Gordon Kimber
Keyword(s):  
Chromosome Pairing ◽  
Seed Set ◽  
Chromosome Association ◽  
Meiotic Behaviour ◽  
Meiotic Analysis

Colchicine-induced autotetraploids of Triticum speltoides, T. longissimum, T. sharonense, T. bicorne, T. uniaristatum, T. monococcum, and T. tauschii were all morphologically similar to but larger than their diploid forms. Seed set was lower than in the diploids except for the autotetraploid T. speltoides. Meiotic analysis showed fewer quadrivalents and more bivalents than would be expected in all of these autotetraploids. Arm-pair switch, indicated by complex trivalents and quadrivalents, was found and involved 0.1% of total chromosomes in T. umbellulatum, 0.5% in T. longissimum, 0.7% in both T. sharonense and T. tauschii, 6.3% in T. bicorne, and 15.3% in T. uniaristatum.Key words: meiosis, chromosome association, arm-pair switch, chromosome pairing, bivalentization.

Corrigendum - Cell Development in the Young Seed of Two Inbred Lines of Pearl Millet, Pennisetum Americanum.

1981 ◽  
Vol 29 (5) ◽  
pp. 617
Author(s):  
MK Rao ◽  
KA Kumari
Keyword(s):  
Pearl Millet ◽  
Mitotic Cycle ◽  
Inbred Lines ◽  
Cell Development ◽  
Field Conditions ◽  
Endosperm Nucleus ◽  
Pennisetum Americanum ◽  
Young Seed

Rate of cell development in embryo and endosperm during the 1st 4 days after pollination was similar in 2 lines of P. americanum under field conditions. 1st division of the endosperm nucleus was complete within 6 h after pollination. Synchronous mitoses, the mitotic cycle, divisions within the embryo and the endosperm and embryo volume increases are described.

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