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Friday, April 24, 2020 | History

2 edition of Bulk versus pure line breeding for seedling vigor and related criteria in wheat crosses (Triticum aestivum L. em Thell) found in the catalog.

Bulk versus pure line breeding for seedling vigor and related criteria in wheat crosses (Triticum aestivum L. em Thell)

Jong-Un Chun

Bulk versus pure line breeding for seedling vigor and related criteria in wheat crosses (Triticum aestivum L. em Thell)

  • 207 Want to read
  • 13 Currently reading

Published .
Written in English

    Subjects:
  • Wheat -- Breeding.

  • Edition Notes

    Statementby Jong-Un Chun.
    The Physical Object
    Paginationix, 62 leaves ;
    Number of Pages62
    ID Numbers
    Open LibraryOL16495098M

      Goals / Objectives Preserve, enhance, and distribute seed of nea accessions; identify plant traits and environments appropriate for use as selection criteria to genetically improve the productivity, stability, and quality of corn, forage, oat, popcorn, and soybean cultivars; develop and modify selection and breeding methods for genetic enhancement of genetically broad-based germplasm. Self pollinators: Pedigree selection. This is a very widely used method, with many minor modifications. Starts with an F 1 between two parents, and proceeds with selection from the F 2 onwards 1 between two parents, and proceeds with selection from the F 2 onwards. The term hybrid is derived from Latin hybrida, used for crosses such as of a tame sow and a wild term came into popular use in English in the 19th century, though examples of its use have been found from the early 17th century. Conspicuous hybrids are popularly named with portmanteau words, starting in the s with the breeding of tiger–lion hybrids (liger and tigon).


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Bulk versus pure line breeding for seedling vigor and related criteria in wheat crosses (Triticum aestivum L. em Thell) by Jong-Un Chun Download PDF EPUB FB2

Bulk selection is much more suited to self- than cross-pollinating species and is totally unsuited for fruit crops and most vegetables. Bulk selection was developed in Sweden in the early 20th century to handle segregating generations of a winter wheat hybrid population designed to combine winterhardiness and.

Breeding Systems - Self Pollinated Crops. Cultivar = variety = released line which 1).can be differentiated from other cultivars and 2).can be reproduced. Can identify small percentage of variants. Breeding Systems. Mass selection. Pure line. Hybridization a. Pedigree b.

Bulk c. Backcross d. Hybrids e. Single seed decent f. Rapid generation advance g. An accelerated-generation increase program for establishing near-homozygous lines was evaluated by both single-seed descent (SSD) and random bulk-population (BP) methods.

After four generations, random SSD- and BP-derived lines from two hybrid populations were evaluated in the F4, F5, and F6 generations in field experiments at two locations.

In separate populations, selection was Cited by: Bulk populations in wheat breeding: Comparison of single-seed descent and random bulk methods. An Bulk versus pure line breeding for seedling vigor and related criteria in wheat crosses book increase program for establishing near-homozygous lines was evaluated by both single-seed descent (SSD) and random bulk-population (BP) methods.

To screen out the wheat genotypes for osmotic stress, stress was induce by PEG to identify drought tolerant wheat genotypes after passing through screening criteria at seedling stage in wheat. new variability and wheat plants with elevated levels of genetic diversity and/or recombination.

Selection of desirable/suitable parents and choice of the mating design is the key to success of plant breeding programs. In crop breeding or cultivar development several mating designs like bi-parental mating.

Multiline Breeding First suggested in oats by Jensen () Method for developing multilines in wheat: Bulk versus pure line breeding for seedling vigor and related criteria in wheat crosses book and Gibler () Seed mixture of isolines, closely related lines or unrelated lines are referred to as multiline and a variety which is developed for commercial cultivation from any of these mixtures is known as multiline variety.

This double haploid individual can then be selfed, becoming the parent for a pure line of homozygote diploid wheat plants. In effect, this achieves several generations of breeding in a single step. This technique is expensive, but to a breeder the time saved justifies the cost.

Plant breeding is the use of natural and artificial selection to produce heritable Bulk versus pure line breeding for seedling vigor and related criteria in wheat crosses book and novel combinations of alleles in plants and to identify plants with novel and useful Size: KB.

Pure line seeds are usually uniform and will grow true-to-type from seed. Hybrids Increasingly in developed countries vegetable seeds are F-1 hybrids (made by sexually crossing inbred lines) because of their greater vigor, uniformity, and yield potential. At maturity the crop is harvested in mass, and the seeds are used to Other articles where Bulk-population method is discussed: plant breeding: Hybridization: The bulk-population method of breeding differs from the pedigree method primarily in the handling of generations following hybridization.

The superior lines are tested in replicated yield trials at several locations. The above mentioned criteria are evaluated for these lines. The line which is superior to the best commercial variety may be released as new variety.

Eleventh or Fourteenth Year: The selected strain should get multiplied to. As the title implies this book is intended to provide an introductory course in plant breeding for undergraduate students. It assumes some elementary knowledge of general botany, genetics and crop production.

The book commences with an account of the parts natural selection and selection imposed by man have played in the evolution of a wide range of crop by: Plant Breeding: Steps and Methods of Plant Breeding for Disease Resistance.

The self-pollinated progeny of homozy­gous plant constitutes a pure line. All the plants in pure line have identical genotype. The wheat variety HUW is a good example of pure line. Variation appearing later in such a pure line is due to environment.

Conventional plant breeding has been going on for hundreds of years, and is still commonly used today. When they do, this is known as a ‘pure line.’ Examples of plants that have been produced via mutation breeding include wheat, barley, rice, potatoes, soybeans, and onions. INTRODUCTION.

Three wheat diseases, stem, leaf, and stripe (or yellow) rust, caused by Puccinia graminis f. tritici (Pgt), P. triticina (Ptr), and P.

striiformis f. sp tritici (Pst), respectively, cause important losses of grain production (McIntosh et al., ).Pgt, and in particular the broadly virulent African strain Ug99, is on many wheat breeders’ minds because this disease had Cited by: The breeding method (or cycle) is complete when the best line(s) are released as improved pure-line cultivars or improved germplasm.

The pure-line cultivar is what is grown by the farmer. Soybean breeders and geneticists use many different breeding methods for Cited by: 3. name of the plant and distinguishes it from other seeds of the same kind. Lot number - defined quantity of seeds identified by a lot number or mark, every portion or bag of which is uniform, within permitted tolerances, relative to the factors which appear in the labeling.

Origin. Stripe rust disease is caused by the fungus Puccinia striiformis f. tritici and severely threatens wheat worldwide, repeatedly breaking resistance conferred by resistance genes and evolving more aggressive strains.

Wild emmer wheat, Triticum dicoccoides, is an important source for novel stripe rust resistance (Yr) genes. Yr15, a major gene located on chromosome 1BS of T. dicoccoides, was Cited by: The certification classes described pertain to “pure-line” varieties. Hybrid rice is developed quite differently.

The seed for hybrid rice are the first generation of seed produced after a cross (F1 population). The seed produced from the cross has extremely high vigor, resulting in high yield potential. However, if. The various approaches used for genetic improvement of crop plants are referred to as plant breeding methods or techniques.

Plant breeding is defined as identifying and selecting desirable traits in plants and combining these into one individual plant.

Since the Mendel's' Laws have provided for scientific genetic breeding of plants. - F2 population is grown in the field and one seed/plant (F3 seed) is harvested. these seeds form the next generation.

often a second seed/plant is kept in reserve - F3 seed harvested are planted and 1 seed/plant (now F4) is harvested from all plants to form the next generation. second seed.

As a result of an application of the embryo culture method, the plants from 10 embryos of F. esculentum × F. cymosum (4×) were obtained by Rumyantseva et al. ().The hybrids were able to produce seeds with crosses with F. esculentum or as a result of self-fertilization. However, the embryos in these seeds were gradually degenerated and irremediably damaged if the seeds stayed on plants Author: G.

Suvorova. The methods of pure-line breeding and mass selection as applied to self-fertilized plants are then described. Pedigree selection in hybrid progenies is described in detail for each generation, some of the refinements in predicting the value of families in the early stages, as developed by Comstock and his colleagues, being referred by: Masterjohn wrote a blog on the book Wheat Belly and it had some really interesting info in it: Here’s my bottomline: today’s industry wheat is a problem, but so is all the other junk food w/ toxins, chemicals, GMOs there is an explosion of autoimmune disease and diet-related diseases today.

for example, today Celiac is estimated to be 4. The source population may be an open-pollinated variety, a synthetic or an advanced generation of a hybrid. Each selected plant is selfed as well as crossed (as male) to a number of randomly selected plants from a tester with broad genetic base.

The selfed seeds are harvested separately and saved for planting in the third year. Selfing species wheat are bred as pure-line varieties with stagnating yield growths.

In contrast, selection gain in maize is high, owing to massive investment sustained by hybrid seed sales, coupled with an efficient exploitation of hybrid vigor.

We have Cited by: Two-Line Hybrid Rice Breeding Manual. i Two-Line Hybrid Rice Breeding Manual S.S. Virmani Z.X. Sun T.M.

Mou A. Jauhar Ali and three-line hybrid breeding programs Similarities in three-line and two-line 15 Using nucleus seeds of EGMS 65 for seed production 2. Using anther culture for   History of sorghum breeding- the hunt for cytoplasmic male sterility The hybrid vigor was first recognized in sorghum by Karper and Corner, in produced by hand-emasculation Inresearcher initiated studies to look for cytoplasmic male sterility as a method for commercial seed production in sorghum Reciprocal crosses between Milo and.

Samples of the seeds that did not germinate were subjected to a tetrazolium test to confirm the possibility of dormancy. The ears of F populations were threshed to determine grain color and texture, according to the criteria of the Brazilian Ministry of Agriculture, Livestock and Supply (MAPA ) for the identification of wheat descriptors.

The main pre-breeding focus is currently the inclusion of host plant resistance to various diseases such as cereal rusts and Fusarium head blight and resistance to the Russian wheat aphid. The responsible use and propper stewardship of these precious genetic resources is a high priority in this group.

Pak. Bot., 49(3):AMMI AND GGE BIPLOT ANALYSIS FOR YIELD STABILITY OF PROMISING BREAD WHEAT GENOTYPES IN BANGLADESH MD.

ASHRAFUL ALAM1,2, 2, HAKIM2, NARESH CHANDRA DEB BARMA3, PARITOSH KUMAR MALAKER2, A ALI REZA2, HOSSAIN4 AND MINGJU LI1* 1Institute of. No single wheat cultivar has all of the traits needed to produce a wheat crop at the lowest input, lowest risk, and highest marketability.

Because of this, plant breeders constantly strive to develop new cultivars that build upon the traits in current cultivars, thereby progressing toward this goal.

Wheat is the primary food grain consumed directly by humans worldwide, and more land around the. The annual rate of genetic gain made due to the breeding efforts in these released cultivars was −% for chocolate spot severity and g/1, seeds (Temesgen, Keneni, & Mohammad, ).

Recent efforts were made to identify faba bean accessions for resistance to new Gall disease in by: 4. ABSTRACT. Seed vigor is a characteristic that determines potential for fast and uniform seedling emergence and establishment of crops. Such characteristic defines crop initial growth what could have direct and indirect effects on capacity of plants in capturing natural nutritive resources and intervene in their competition intra- and interspecific.

In evolutionary plant breeding, crop populations with a high level of genetic diversity are subjected to the forces of natural selection. In a cycle of sowing and re-sowing seed from the plant population year after year, those plants favored under prevailing growing conditions are expected to contribute more seed to the next generation than plants with lower by: Study 56 Plant Science Exam 2 flashcards from Carrie E.

on StudyBlue. Where a new variety is derived from the progeny of a single pure line or a single plant selection.

List some disadvantages of the bulk breeding method. Start studying chapter Learn vocabulary, terms, and more with flashcards, games, and other study tools. bulk selection: A selection method for self-pollinating species of crop foods—e.g., rice, wheat—in cross breeding.

After the first cross, the segregating progenies are propagated for four to six generations—F4 to F6—without selection, resulting in a high degree of homozygocity in the progeny, at which point individuals are selected and their.

allowstimetoworkwithmor§hebulksystem naturalselection is supposed to operate to eliminatelow yieldingandunsuitabletypes,increasingtheebanoeofselect. Line D pdf commercialized pdf MSU D That soft white winter wheat line has high test weight and above average yield.

Production of Breeders Seed of D, a high yielding line soft wheat with strong protein was initiated.

Pre-Breeder seed is being generated for lines E, E, E, E, E, D, and R  A roadmap for breeding orphan leafy vegetable species: Such a product can take the form of a pure line variety, an open-pollinated variety, a hybrid (e.g., single cross, three-way cross, or Cited by: The Doubled-Haploid (DH) process accelerates genetic ebook by reducing the number of plant generations it takes to achieve a pure line.

Completely homozygous lines help ensure all plants of a given variety are identical, which increases the precision of testing results and .