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

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.

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.

scholarly journals Metaphase I centromere co-orientation in interchange heterozygotes of pearl millet

1979 ◽  
Vol 34 (1) ◽  
pp. 69-76 ◽  
Author(s):  
Prasad R. K. Koduru
Keyword(s):  
Pearl Millet ◽  
Genetic Background ◽  
Genetic Regulation ◽  
Pennisetum Americanum ◽  
Predominant Role ◽  
Metaphase I

SUMMARYUsing interchanges T(1, 3) and T(3, 6) of Pennisetum americanum orientation types of the interchange multiple at MI were studied in different genetic backgrounds. Orientation types alternate 1 and alternate 2, in addition to adjacent 1, adjacent 2 and indefinite could be identified for both the interchanges. The relative frequencies of various orientation types were influenced by a change in the genetic background.For these interchanges, homologous centromeres do not seem to play a predominant role in the co-orientation of interchange multiple. The non-homologous co-orientation types were more subjected to genetic regulation than the homologous co-orientations.

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