Registration of N551 and N552 Parental Inbred Lines of Maize

Crop Science ◽  
2006 ◽  
Vol 46 (2) ◽  
pp. 1014-1015 ◽  
Author(s):  
W.K. Russell
Keyword(s):  
Inbred Lines ◽  
Parental Inbred

Yields of mixtures of single-cross hybrid field beans (Viciafaba L.) with one of the parental inbred lines

1966 ◽  
Vol 67 (2) ◽  
pp. 235-237 ◽  
Author(s):  
D. A. Bond ◽  
J. L. Fyfe ◽  
Gillian Toynbee-Clarke
Keyword(s):  
Inbred Lines ◽  
The Other ◽  
Normal Rate ◽  
Single Cross ◽  
Parental Inbred ◽  
The Mean ◽  
Field Beans

The yields of seed from a hybrid, one of its parents and different mixtures of the hybrid and parent were compared in the case of two different hybrids. Open-pollinated controls were included in the trial, which was sown at about the normal rate for beans. With both hybrids a mixture of 11 of hybrid to 1 of parent yielded as well as the hybrid itself and mixtures of 2 of hybrid to 1 of parent yielded in both cases about 7 cwt./acro more than the mean of the open-pollinated controls. With the higher-yielding hybrid, which had less contrast in vegetative vigour between hybrid and parent, mixtures in the proportions 5:1 and 2:1 showed declining yields, but with the other hybrid they yielded as well as the pure hybrid.

Maize Stand Density Yield Response of Parental Inbred Lines and Derived Hybrids

Crop Science ◽  
2016 ◽  
Vol 57 (1) ◽  
pp. 32-39 ◽  
Author(s):  
Agustina Amelong ◽  
Fernando Hernández ◽  
A. Daniel Novoa ◽  
Lucas Borrás
Keyword(s):  
Stand Density ◽  
Inbred Lines ◽  
Yield Response ◽  
Parental Inbred

scholarly journals DISTRIBUTION OF NONSTRUCTURAL VARIATION ALONG THREE CHROMOSOME ARMS BETWEEN WHEAT CULTIVARS CHINESE SPRING AND CHEYENNE

Genetics ◽  
1984 ◽  
Vol 106 (2) ◽  
pp. 309-324
Author(s):  
Anne Crossway ◽  
Jan Dvořák
Keyword(s):  
Chinese Spring ◽  
Continuous Distribution ◽  
Inbred Lines ◽  
Wheat Cultivars ◽  
Chromosome Variation ◽  
Homologous Chromosomes ◽  
Ring Bivalents ◽  
Chromosome Arm ◽  
Parental Inbred ◽  
The Mean

ABSTRACT Metaphase I (MI) pairing of wheat homologous chromosomes is usually reduced in hybrids between cultivars relative to the parental inbred lines. Previous work suggested that this phenomenon is caused by polymorphism in nucleotide sequences (nonstructural chromosome variation) among wheat cultivars. The present work investigated the distribution of this variation along three selected chromosome arms between cultivars Chinese Spring and Cheyenne. Chinese Spring ditelosomics 3Aq, 6Ap and 6Bp were crossed with disomic substitutions of Cheyenne chromosomes 3A, 6A and 6B in Chinese Spring, respectively. The resulting F1 plants, called substituted monotelodisomics, were crossed with the respective Chinese Spring monosomics, producing potentially "recombinant" substituted monosomics. When these "recombinant" chromosomes were combined with the parental Chinese Spring telosomes, marked reductions in mean telosome-pairing frequency were found compared with the corresponding Chinese Spring monotelodisomics. The mean pairing frequencies of the "recombinant" chromosomes showed a continuous distribution between those of the substituted and Chinese Spring monotelodisomics. The results suggest that the nonstructural variation that reduces MI pairing between chromosomes of different wheat cultivars is not localized in a specific site but distributed along each chromosome arm. Little variation was found among monotelodisomics for either the number of ring bivalents per cell or the number of univalents other than those constituting the heteromorphic pair. This implies that the reductions in MI pairing between the Cheyenne and Chinese Spring chromosomes are caused by something residing within these specific chromosomes that does not affect the pairing of the remaining Chinese Spring chromosomes in the same cell. Furthermore, the absence of parental types among the "recombinant"-substituted monotelodisomics suggests that the sequences involved in the variation studied here are capable of converting heterohomologous chromosomes to something intermediate in nature in the span of only a single generation.

Relationship between the performance of parental inbred lines and hybrids for food-feed traits in maize (Zea mays L.) in Ethiopia

2013 ◽  
Vol 153 ◽  
pp. 86-93 ◽  
Author(s):  
Berhanu Tadesse Ertiro ◽  
Habtamu Zeleke ◽  
Dennis Friesen ◽  
Michael Blummel ◽  
S. Twumasi-Afriyie
Keyword(s):  
Zea Mays ◽  
Zea Mays L ◽  
Inbred Lines ◽  
Parental Inbred

scholarly journals Vulnerability of U.S. Maize Germ Plasm to Phaeosphaeria Leaf Spot

Plant Disease ◽  
1999 ◽  
Vol 83 (5) ◽  
pp. 462-464 ◽  
Author(s):  
M. L. Carson
Keyword(s):  
Leaf Spot ◽  
Inbred Lines ◽  
Hybrid Seed Production ◽  
Maize Crop ◽  
Public And Private ◽  
Maize Production ◽  
Seed Industry ◽  
Parental Inbred ◽  
Southern Florida ◽  
The U.S

Phaeosphaeria leaf spot (PLS) is a potentially important maize disease that has recently appeared in the continental United States in winter breeding nurseries in southern Florida. To better predict the potential of this newly introduced disease to inflict damage on the U.S. maize crop, 64 public and private inbred lines and 80 proprietary commercial maize hybrids representing the genetic diversity in the U.S. maize crop were evaluated for resistance to PLS in the 1996-97 and 1997-98 winter nursery seasons. Plots were evaluated for PLS severity (0 to 9 scale) at the early to mid dent stages of kernel development. Relatively few hybrids or inbreds were free from PLS at this growth stage. Inbred lines related to B73 were particularly susceptible to PLS. Relatively few commercial hybrids were as severely diseased as a susceptible check hybrid, indicating that U.S. maize production is not particularly vulnerable to damage from PLS at this time. However, the susceptibility of several widely used parental inbred lines makes PLS a potential concern to the seed industry should it become established in areas of hybrid seed production.

Registration of B97 and B98, Two Parental Inbred Lines of Maize

Crop Science ◽  
1994 ◽  
Vol 34 (1) ◽  
pp. 318-319 ◽  
Author(s):  
Arnel R. Hallauer ◽  
K. R. Lamkey ◽  
W. A. Russell ◽  
Paul R. White
Keyword(s):  
Inbred Lines ◽  
Parental Inbred

scholarly journals Correlations Between Parental Inbred Lines and Derived Hybrid Performance for Grain Filling Traits in Maize

Crop Science ◽  
2013 ◽  
Vol 53 (4) ◽  
pp. 1636-1645 ◽  
Author(s):  
Santiago Alvarez Prado ◽  
Brenda L. Gambín ◽  
A. Daniel Novoa ◽  
David Foster ◽  
M. Lynn Senior ◽  
...  
Keyword(s):  
Grain Filling ◽  
Inbred Lines ◽  
Hybrid Performance ◽  
Parental Inbred

scholarly journals Genetic and biochemical characterization of parental inbred lines in marker assisted selection for quality protein maize

Genetika ◽  
2014 ◽  
Vol 46 (2) ◽  
pp. 579-590 ◽  
Author(s):  
Marija Kostadinovic ◽  
Dragana Ignjatovic-Micic ◽  
Goran Stankovic ◽  
Jelena Vancetovic ◽  
Danijela Ristic ◽  
...  
Keyword(s):  
Marker Assisted Selection ◽  
Biochemical Characterization ◽  
Backcross Progeny ◽  
Essential Amino Acids ◽  
Inbred Lines ◽  
Quality Protein Maize ◽  
Normal Maize ◽  
Parental Inbred ◽  
Maize Protein ◽  
Biochemical Variability

Maize protein is deficient in two essential amino acids, lysine and tryptophan. Naturally occurring opaque2 (o2) mutation which increases the levels of tryptophan and lysine in the grain also confers an undesirable phenotype leading to low yields and more susceptible, soft and chalky kernels. Quality Protein Maize (QPM) is agronomically acceptable and nutritionally improved opaque2 maize. Marker assisted selection increases reliability and efficiency, reduces time and costs taken to obtain QPM. The results presented in this paper are a part of the Maize Research Insitute project on conversion of normal maize lines to QPM lines adapted for growing in temperate regions trough marker assisted backcross (MAB). Genetic and biochemical variability was analyzed between normal (ZPL 5) and QPM (CML 144) parental inbred lines and the efficiency of the three opaque2 specific SSR markers was examined. Markers phi057 and umc1066 can discriminate homozygous and heterozygous backcross progeny, thus can be used as foreground selection markers for the opaque2 gene. The genetic similarity between analyzed lines was 0.05, which confirmed good selection of parental lines for the creation of hybrids. Tryptophan content was 0.093 and QI was 0.85 in CML 144, approximately twice as high compared to 0.054 and 0.48 in ZPL 5. Both tryptophan and QI values for CML 144 were above the QPM treshold, i.e. tryptophan for 24% and QI for 0.625%, making it a suitable donor line of o2. These results represent the framework for marker assisted introgression of the quality protein trait into local maize genotype.

scholarly journals Mating designs commonly used in plant breeding: A review

2020 ◽  
pp. 1855-1869
Author(s):  
Jane Muthoni ◽  
Hussein Shimelis
Keyword(s):  
North Carolina ◽  
Plant Breeding ◽  
Base Material ◽  
Inbred Lines ◽  
Natural Hybridization ◽  
Mating Design ◽  
The North ◽  
Parental Inbred ◽  
F2 Generation ◽  
Estimation Of Variance

Mating design represents "rules" for arranging different controlled crossings; a mating design is a procedure of producing progenies. This review describes mating designs commonly used in plant breeding. Biparental is the simplest design in which a number of P plants are paired off to give ½P families; the parents are mated only once in pairs. The design is simple and it provides information needed to determine if significant genetic variation is present in a population for a long term selection program. A polycross is a mating arrangement for interpollinating a group of cultivars or clones using natural hybridization in an isolated crossing block. The design is often used for generating synthetic cultivars. The North Carolina (NC) mating designs permit determination and/or estimation of variance components (additive and dominance components) by using the information from half-sib (HS) families. The experimental material of North Carolina designs I, II and III is developed from F2 generation as a base material. The design III (NCIII) involves backcrossing the F2 plants to the two parental inbred lines from which the F2 were derived. The NCIII design was extended to include a third tester. This third tester is the F1 from the two parental inbred lines; in this extended form, this design is known as the triple test cross (TTC). Line x Tester mating design uses inbred lines as the base population. The design is useful in deciding the relative ability of a number of female and male inbreds to produce desirable hybrid combinations. When the same parents are used as females and males in breeding, the mating design is called diallel. Parents used range from inbred lines to broad genetic base varieties to clones. The design is the most commonly used in crop plants to estimate GCA and SCA and variances. Generally, it should be noted that is not the mating design per se, but the breeder who breeds a new cultivar. Consequently, proper choice and use of a mating design will provide the most valuable information for breeding

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