pure strains f1

[buck]

just a thought i wanted to run past everyone about all the crosses coming out around the world and the thought of loosing the mighty strains of the past like true nl#1 and skunk#1 and many others that are being crossed , is it a good thing or a bad thing ?

 

what does everyone think ?

[Luke Skywalker]

Those aren't F1's.... they're IBL (in-bred-lines).

 

You didn't get those strains without crossing, so yeah, it's a good thing IMO. So long as we always aim upwards and most importantly, aim at all, we should be proud of our breeders.

[WantDaChronic]

all the pure strains are just inbred hybrids.

 

imo i think breeders/seedbanks release strains far too early and use parents that are unsuitable for breeding. there are some fantastic strains out these days which are made up of multiple hybrids, ie. jack herrer, but if used for breeding the seeds produced can sprout just about anything i personally feel that seebanks and breeders should make the hybrids like jack herrer extremely stable before releasing it so that if you were to cross it with something else, it would look like your jack herrer x what ever strain, not just it could be bloody anything

[Ford]

A F1 is the cross of 2 IBL's.

 

[freddie]

There are some great hybrids and multi-hybrids out but i wouldn't mind seeing some old land race varieties available as well. I think you can go too far with hybrids. Some of the Dutch stuff tend to be a little bland. Too many Indicas maybe.

 

mo i think breeders/seedbanks release strains far too early and use parents that are unsuitable for breeding. there are some fantastic strains out these days which are made up of multiple hybrids, ie. jack herrer, but if used for breeding the seeds produced can sprout just about anything thumbdown.gif i personally feel that seebanks and breeders should make the hybrids like jack herrer extremely stable before releasing it so that if you were to cross it with something else, it would look like your jack herrer x what ever strain, not just it could be bloody anything doh.gif

 

Most breeders are just after a quick buck. It's all about marketing.

[postman]

An IBL (inbred line) is a genetically homogeneous strain that grows uniformly from seed.

 

A hybrid is a strain made up of two genetically unlike parents, IBL or hybrid.

 

When you cross two different IBL strains for the FIRST time, it is called the F1 generation. When you cross two of the same F1 hybrid (inbreed), it is called the F2 generation.

 

The process of selective inbreeding must continue at least until the F4 to stabilize the recurrently selected traits. When you cross two specimens of an IBL variety, you get more of the same, because an IBL is homozygous, or true breeding for particular traits.

[nitram]

F1 hybrid

 

F1 hybrids are the first generation seeds/plants or animal offspring resulting from a cross mating of distinctly different parental types, the offspring of which produce a new, uniform variety with specific characteristics from both parents. In fish breeding, those parents frequently are two closely related fish species, while in plant and animal genetics those parents usually are two inbred lines. Mules are F1 hybrids between horse and donkey. Crossing specific parent plants produces a hybrid seed (plant) by means of controlled pollination. To produce consistent F1 hybrids, the original cross must be repeated each season. As in the original cross, in plants this is usually done through controlled hand-pollination, and explains why F1-seeds are so expensive.

 

In agronomy the term "F1 hybrids" is usually reserved for agricultural cultivars where he parental types are two inbred and thus almost homozygous lines. Because of the almost pure homozygosity of the parent lines, F1 hybrids have a very high level of heterozygosity. As a result of this, F1 hybrids display improved growth and yield characteristics.

 

Production of F1 hybrids

 

In plants Two populations of breeding stock with desired characteristics are subject to inbreeding until the homozygocy of the population exceeds a certain level, usually 90% or more. Typically this requires more than ten generations. After this happens, both populations must be crossed while avoiding self-fertilization. Normally this happens in plants by deactivating or removing male flowers from one population, taking advantage of time differences between male and female flowering or hand-pollinating[1].

In animals

Commonly breeded fish species as well as all mammals and birds are not hermaphrodite, like most plants are, and therefore it is much more easy to prevent self-fertilization during a F1 cross. F1 crosses in fish can be between two inbred lines or between two closely related fish species, like between cichlid subspecies.[2]. The cross usually is performed by natural or artificial insemination.

Advantages

• Homogenity and predictability - because of the homozygocy of the parent pure lines, there is next to none genetic variation between individual plants or animals. This makes their phenotype extremely uniform and thus attractive for mechanical operations and makes it easier to fine-tune the management of the population. Once the characteristics of the cross are known, repeating this cross will yield exactly the same result.

 

• Higher performance - As all not junk DNA alleles codify for a certain version of a protein or enzyme, having two different versions of this allele amounts in having two different versions of the enzyme. This will increase the likelihood of having an optimal version of the enzyme present and reduce the likelihood of a genetic defect. This effect is referred to in genetics as the genetic hysteresis effect.

Disadvantages

 

• The main advantage of F1 hybrids is their drawback as well. When F1 cultivars are used for the breeding of a new generation, their offspring will revert to the natural level of heterozygocy and thus will have a depression in yield. Of course, this is a desired characteristic from the point of view of the seed producer.

 

• Both inbreeding as well as crossing both lines requires a lot of work, which translates in a much higher seeds cost. In general, the higher yield offsets this disadvantage.

Generation is the act of producing offspring, or procreation. It is also the act of bringing something into being (such as electrical generation and cryptographic code generation). A generation can also

 

hermaphrodite is an organism of a species whose members possess both male and female sexual organs during their lives. In many species, hermaphroditism is a normal part of the life-cycle. Generally, hermaphroditism occurs in the invertebrates, although it occurs in a fair number of fish, and to a lesser degree in other vertebrates.

 

A pure line (also hyphenated) refers to a genetic trait for which an individual or a population is entirely homozygous. Gregor Mendel isolated a series of pure lines in pea plants in order to demonstrate the rules of assortment and segregation.

 

The phenotype of an individual organism is either its total physical appearance and constitution, or a specific manifestation of a trait, such as size or eye color, that varies between individuals. Phenotype is determined to some extent by genotype, or by the identity of the alleles that an individual carries at one or more positions on the chromosomes.

 

Since there seems to be so much confusing information floating around concerning breeding high-quality strains, I've taken it upon myself ot clear the air - and in plain English that your average basement botanist can understand and actually put to use.

Some of the confusion around the issue of F1s and F2s is self-perpetuating. Bad information handed around freely. If you can grow high-quality plants, you already possess the necessary elements of a solid breeding program.

Granted, you need a good seed to start with, but if you're interested in breeding, a few very simple guidlines can virtually assure success without compromising the integrity of your seedless babies. Aside from that, it's also fun to experiment with breeding toward that ideal plant (as if you would stop when you got there!).

 

Defenitions

• Backcrossing: Crossing an offspring with one of its parents to reinforce a parental trait.

• Outcrossing: Crossing a plant with an unrelated variety.

• Stabilized Hybrid: A variety that was bred, hten backcrossed with itself for successive generations, the end result being a true-breeding strain. Example: Skunk #1.

• F1 Hybrid: The result of crossing two unrelated varieties to produce a strain bearing characteristics of both parents. Example: Northern Lights #5 x Haze #1.

• F2 Hybrid: A cross of two related plants; pertains only to hybrids. Example: Any F1 bred to itself, or any crossing of this line back to itself.

• Pure Variety: Any true-breeding population. Example: Afghani, Durban and Thai.

 

take a look - god reading The info is here