Cytogenetics of a semidwarf phenotype in pearl millet, Pennisetum americanum (L.) Leeke

1984 ◽  
Vol 26 (3) ◽  
pp. 272-278
Author(s):  
Prasad R. K. Koduru ◽  
M. Krishna Rao
Keyword(s):  
Pearl Millet ◽  
Unit Area ◽  
Mutant Phenotype ◽  
Pennisetum Americanum ◽  
Selfed Progeny ◽  
Phenotypic Marker ◽  
Early Maturity ◽  
Interchange Heterozygote ◽  
Dark Green ◽  
Potential Use

A semidwarf phenotype designated TLD (translocation dwarf) was isolated as a segregant in the selfed progeny of a spontaneously produced interchange heterozygote in the line IP 457 of pearl millet. The mutant is characterised by dark green and erect narrow leaves, early maturity, and a sterile spike tip. Chlorophyll content per unit area of leaf in the mutant is about 29% more than in the control. Results of cytogenetic evaluation of the semidwarf showed that the mutant phenotype is an interchange homozygote. The homozygosity for the interchanged chromosomes and the mutant phenotype are tightly linked; the chromosomes involved are identified as chromosomes 3 and 6. The phenotype is inherited as monogenic recessive. There is normal viability of gametes carrying interchange chromosomes attended by normal viability of zygotes of the three genotypic classes. The potential use of this phenotypic marker as a tester in genetic and breeding experiments concerning the improvement of this crop is stressed.Key words: Pennisetum, pearl millet, translocation, dwarf.

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.

scholarly journals Production Determinants of the Pearl Millet Cropping System in Uganda and Implications to Productivity

2016 ◽  
Vol 8 (7) ◽  
pp. 97
Author(s):  
G. Lubadde ◽  
P. Tongoona ◽  
J. Derera ◽  
J. Sibiya
Keyword(s):  
Pearl Millet ◽  
Insect Pests ◽  
Household Head ◽  
Cropping System ◽  
High Yield ◽  
Production Environment ◽  
Stay Green ◽  
Early Maturity ◽  
Rust Diseases ◽  
Financial Credit

<p>Pearl millet is an important crop for people living in semi-arid areas in Uganda but not much is known about its production environment. A survey was conducted in eastern and northern regions of Uganda to characterise the pearl millet cropping system and to identify the most important production determinants. Using questionnaires, data was collected from 160 households through face-to-face interviews with the respondents. Results showed that pearl millet was mainly grown for food and source of income. The production environment was low input as farmers planted unimproved genotypes, used no artificial chemicals or manure, and had minimal access to financial credit and agricultural trainings or extension services. Planting was done in the second rains with no optimal use of important resources like family labour and seed due to seed broadcasting. Farmers desired genotypes with traits such as; stay green, being tall, high tillering, high yield, early maturity and being ergot resistant. The most important constraints were ergot and rust diseases susceptibility, low yield, low tillering, late maturity, sterile panicles, rodents, moulds/rotting and insect pests; while lack of market, low prices and price fluctuation were the important market constraints. Results further showed that farmers lacked knowledge about the common diseases like rust and ergot. The area planted, spouse age and years of pearl millet cultivation were the important factors enhancing production while age of household head, amount of seed planted and distance to the market negatively affected grain yield.</p>

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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