What is single seed descent method?
What is single seed descent method?
A breeding procedure used with segregating populations of self-pollinated species in which plants are advanced by single seeds from one generation to the next is referred to as single seed descent method. This method was suggested by Goulden (1939) for advancing segregating generation of self-pollinated crops.
Who first used single seed descent method?
Goulden
Single Seed Descent Method: The idea of this method was first suggested by Goulden (1941) and subsequently modified by Brim (1960). General principles involved in this method is that, only one ( single) seed collected from each of the F2 plants ( 10000 to 20000) and then bulked to grow the next ( F3) generation.
What is SSD method?
Single Seed Descent (SSD) describes a protocol utilized during the inbreeding of populations of self-and cross-pollinated species in the development of homozygous lines.
What is pedigree method in plant breeding?
Pedigree refers to record of the ancestry of an individual selected plant. Pedigree breeding is a method of genetic improvement of self-pollinated species in which superior genotypes are selected from segregating generations and proper records of the ancestry of selected plants are maintained in each generation.
What is back cross method?
backcross. A breeding method used to move one or a only a few desirable genes from an agronomically poor crop line to an elite line. This is done by crossing a donor parent to an elite line, and crossing offspring with the ‘desired gene(s)’ back to the elite parent.
What is modified bulk method?
Modification of the Bulk Method. A modification of the bulk method based on artificial selection in F2 and the subsequent generations is outlines below. F2 and F3 Generations. F2 and F3 generations are space-planted and a large number (1,000-5,000) of desirable plants are harvested separately.
Who proposed SSD method?
This method is modification of bulk method. First proposed by Goulden (1939) and later modified by Brim (1966). Instead of bulking whole seed lot of selected plants, a single seed is selected randomly from each selected plant to make bulk.
What might you store on a solid state drive?
Flash memory and solid state drives SSDs USB memory sticks and memory cards are compact forms of flash memory used with cameras, smartphones and tablet computers. The internal storage of a computer can use a solid state drive (SSD), which is a much larger piece of flash memory.
Which is the oldest breeding method?
Selection also called the German method is the oldest plant breeding method.
Who is father of plant breeding?
Gregor Mendel
Gregor Mendel (1822–84) is considered the “father of genetics”. His experiments with plant hybridization led to his establishing laws of inheritance. Genetics stimulated research to improve crop production through plant breeding.
What is difference between test cross and backcross?
A heterozygous genotype has a dominant and a recessive allele. Whereas a homozygous genotype can have either both dominant or both recessive alleles….Differentiate between back cross and test cross.
| Test cross | Back cross |
|---|---|
| All test crosses are backcrosses. | A backcross can be said as a test cross if the parent is recessive. |
Why is back cross done?
Backcross, the mating of a hybrid organism (offspring of genetically unlike parents) with one of its parents or with an organism genetically similar to the parent. The backcross is useful in genetics studies for isolating (separating out) certain characteristics in a related group of animals or plants.
What is the meaning of single seed descent?
Meaning of Single Seed Descent Method: A breeding procedure used with segregating populations of self-pollinated species in which plants are advanced by single seeds from one generation to the next is referred to as single seed descent method.
How is single seed descent used in rice breeding?
Single Seed Descent (SSD) and Rapid Generation Advance (RGA) have been applied in many conventional breeding programs to speed up breeding cycle. SSD was used to develop cold-tolerant RILs.
How is a single seed selected in hor204?
Instead of bulking whole seed lot of selected plants, a single seed is selected randomly from each selected plant to make bulk.