scholarly journals Growth of an Annual Strain of Oryza glaberrima Steud. and a Perennial Cultivar of Oryza sativa L. after Heading.

1994 ◽  
Vol 63 (4) ◽  
pp. 632-637 ◽  
Author(s):  
Yasuo TAKASAKI ◽  
Yoichi SEKI ◽  
Hirosi NOJIMA ◽  
Akihiro ISODA
Keyword(s):  
Oryza Sativa ◽  
Oryza Sativa L ◽  
Oryza Glaberrima

PREFERENTIAL PAIRING OF CHROMOSOMES IN A TETRAPLOID HYBRID BETWEEN ORYZA GLABERRIMA AND O. SATIVA

1968 ◽  
Vol 10 (3) ◽  
pp. 527-535 ◽  
Author(s):  
Hiko-Ichi Oka
Keyword(s):  
Oryza Sativa ◽  
Oryza Sativa L ◽  
Oryza Glaberrima ◽  
Tetraploid Species ◽  
Preferential Pairing ◽  
Tetraploid Hybrid ◽  
Segregation Ratios ◽  
Gametic Selection ◽  
High Degree ◽  
Species Hybrids

A tetraploid hybrid was obtained from a cross between induced tetraploid strains of Oryza sativa L. and O. glaberrima Steud., which differed in glutinous (waxy) vs. non-glutinous starch (gl: +) and other genes. In the hybrid, as compared with the parental strains, there was a reduced number of quadricvalents and a relatively high degree of fertility. Segregation ratios for the glutinous gene observed in the back-cross and F2 generation appeared to be modified not only by preferential homogenetic pairing but also by gametic selection. Taking into account the effect of gametic selection estimated from simplex heterozygotes, it was suggested that preferential pairing could take place to a certain extent. It seems to be difficult to measure quantitatively the degree of preferential pairing in tetraploid species hybrids, unless the effect of various segregation-distorting factors can be accounted for.

scholarly journals Effects of spacings and butachlor levels on weed control, growth and yield of NERICA 1 rice (Oryza sativa L. x Oryza glaberrima L.)

2017 ◽  
Vol 62 (4) ◽  
pp. 361-369
Author(s):  
Hassan Kasim ◽  
Ibrahim Musa ◽  
Mustapha Muhamman
Keyword(s):  
Oryza Sativa ◽  
Grain Yield ◽  
Weed Control ◽  
Crop Production ◽  
Field Experiments ◽  
Oryza Sativa L ◽  
Growth And Yield ◽  
Oryza Glaberrima ◽  
Control Growth ◽  
Main Plot

Poor agronomic practices coupled with herbicide mismanagement influence crop performance, yield, weed infestation and environmental hazards. Thus, field experiments were carried out to investigate the effect of spacing and reduced levels of butachlor on weed control and yield of NERICA 1 rice (Oryza sativa L. x Oryza glaberrima L). The experiments were conducted in the 2011 rainy season at the Teaching and Research Farm of the Department of Crop Production and Horticulture, Modibbo Adama University of Technology, Yola, and Lake Gerio, Yola in the 2012 dry season. Yola is located between latitude 9o14? N and longitude 12o28? E in the Northern Guinea Savanna ecological zone of Nigeria. Treatments consisted of four spacings (20 cm x 20 cm, etc.) and four butachlor levels (3, 2, 1, and 0 kg ha-1 a.i.). The experiments were laid out in a split-plot design with spacings assigned to the main plot and butachlor levels assigned to the sub-plot and were replicated three times. Data were taken on percentage establishment, number of leaves per plant, general weed cover, panicle length and grain yield per hectare. Data generated were subjected to analysis of variance. Means showing a significant F-test were separated using LSD. Results obtained showed that butachlor at 1 kg ha-1 and 14 cm x 14 cm spacing gave the highest grain yield of 1441 kg ha-1 and maximum weed control. They are, therefore, recommended for adoption by farmers in Yola and similar environments.

Field Evaluation of Rice Genotypes from the Two Cultivated Species (Oryza sativa L. and Oryza glaberrima Steud.) and Their Interspecifics for Tolerance to Drought

Crop Science ◽  
2012 ◽  
Vol 52 (2) ◽  
pp. 524-538 ◽  
Author(s):  
Marie Noelle Ndjiondjop ◽  
Koichi Futakuchi ◽  
Fousseyni Cisse ◽  
Hugues Baimey ◽  
Roland Bocco
Keyword(s):  
Oryza Sativa ◽  
Oryza Sativa L ◽  
Field Evaluation ◽  
Oryza Glaberrima ◽  
Cultivated Species ◽  
Rice Genotypes
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