:D Genetic Preservation :D - Breeding

[GMT]

Roman, I actually started my tri breeding, not so much for the tris, but to learn whether what was being said on boards was true. Some were claiming to be able to lock in any trait in 3 generations. Just another bullshit claim. I'm 16 in and its not locked yet. Despite every parent showing the trait.

Zif, its been a fun discussion, see you on the next one mate.

 

[romanoweed]

like clearly stated the selection-practises in previous post are not what im knowledgable, im more well-read in preservation. I will have to re-read them trough till finish.

 

[romanoweed]

I just realized that the Book wich i started reading, and wich said landraces have a certain sized population is the same as @verdantgreen said is very interesting for landraces, and its the same as i think @zif has read aswell.

i think i gonna choose this and read it till the end.
Found it to be well readable too.
"principles of plant breeding 2"

 

[acespicoli]

Principles of Plant Breeding, 2nd Edition

Robert W. Allard
ISBN: 978-0-471-02309-8


~~~
Principles of Plant Genetics and Breeding 2nd Edition






by George Acquaah



ISBN-13: 978-0470664759
ISBN-10: 0470664754
https://gtu. ge/Agro-Lib/Principles%20of%20Plant%20Genetics%20and%20Breeding.pdf

I just realized that the Book wich i started reading, and wich said landraces have a certain sized population is the same as @verdantgreen said is very interesting for landraces, and its the same as i think @zif has read aswell.

i think i gonna choose this and read it till the end.
Found it to be well readable too.
"principles of plant breeding 2"

Are these the ones you were reading ?
think these were the two quoted?


the one was in pdf
the other Amazon had for like 20+$ used as VG had said
sometimes its nice to have the print copy

Started reading the Principles of Plant Genetics and Breeding 2nd Edition book myself very educational

 

[romanoweed]

yup the 2nd

 

[acespicoli]

Good reads

https://phytokeys.pensoft. net/article/46700/

Abstract

Two kinds of drug-type Cannabis gained layman’s terms in the 1980s. “Sativa” had origins in South Asia (India), with early historical dissemination to Southeast Asia, Africa, and the Americas. “Indica” had origins in Central Asia (Afghanistan, Pakistan, Turkestan). We have assigned unambiguous taxonomic names to these varieties, after examining morphological characters in 1100 herbarium specimens, and analyzing phytochemical and genetic data from the literature in a meta-analysis. “Sativa” and “Indica” are recognized as C. sativa subsp. indica var. indica and C. sativa subsp. indica var. afghanica, respectively. Their wild-growing relatives are C. sativa subsp. indica var. himalayensis (in South Asia), and C. sativa subsp. indica var. asperrima (in Central Asia).




Conclusions

The four Cannabis varieties circumscribed and named here merit formal recognition. Recognizing infraspecific taxa helps to identify populations vulnerable to extinction (e.g., Ellstrand 2003; Haig et al. 2006). In the wake of the United Nations Biodiversity Convention, infraspecific variation has become a focus for conservation efforts (Coates et al. 2018). Recognizing the four Cannabis varieties and their unique morphological and chemical characters also provides “prior art,” thwarting claims of originality in Cannabis utility patents.
Collection and conservation of germplasm of indigenous populations of Central and South Asian landraces in their centers of diversity is urgently needed. The germplasm base outside their centers of diversity has become genetically contaminated by widespread crossbreeding. In the context of climate change and unpredictable future needs, in situ conservation of agrobiodiversity is much preferable for crop plants and their wild relatives, but given the precarious continued existence of unaltered aboriginal wild populations of Cannabis in Asia, preservation in seed banks is an immediate priority. Hopefully the unambiguous names provided may help prevent extinction of these taxa.



Figure 3.
Representative achenes of four varieties A indica, Rajshahi (Bangladesh), Clarke 1877 (BM) B indica, Coimbatore (India), Bircher 1893 (K) C indica, South Africa, Hillig 1996; (IND) D himalayensis neotype E himalayensis, Bareilly (India), Roxburgh 1796 (K). F himalayensis, East Bengal (Bangladesh) Griffith 1835 (GH) G afghanica neotype H afghanica epitype I afghanica Yarkant (X?nji?ng), Henderson 1871 (LE) J asperrima lectotype K asperrima Nurist?n (Afghanistan), Street 1965 (F) L Kailiyskiy Alatau (Kazakhstan), Semenov-Tyan-Shansky 1857 (LE).


Figure 7.
Distribution of herbarium specimens. Red circles: var. asperrima; green triangles: var. himalayensis. Floristic zones based on Djamali et al. (2012): Red area: Irano-Turanian region; green area: Indian region; lilac area: Saharo-Sindian region. Other floristic regions not demarcated and unlabeled. Background base map by Natural Earth, free open-source map data (https:// www.naturalearthdata. com).

Genetic characters
Molecular genetic studies of Central and South Asian populations – which have not been significantly hybridized in recent times – are limited in number. Twenty years ago, when unhybridized landraces were much more readily available, molecular methods were blunt instruments. Today, we can decode the DNA sequence of whole genomes, but a good representation of the range of unhybridized biodiversity is not available for analysis, although collection of genuinely representative germplasm from Asia may still be possible. Herbaria of course are invaluable repositories of older specimens, but collections from Asia are relatively limited, and for various reasons, curators have often been unable to allow sampling of older collections.


just some excerpts from the article, hope you have time to read it very interesting

 

[romanoweed]

WOW, i just found a very helpful Post by djonkoman with some hyphothesis/explonation about inbreeding Depression, here:

https://www.icmag.com/ic/showthread.php?t=373971&page=8

 

[GMT]

Djonkoman is on the ball with his posts. He certainly knows his stuff.

 

[romanoweed]

What i take from it is this Hyphotheseis: Obviously we dont wanna outcross for preservation, but could we avoid those mutations by keeping more Phenos? (wich means selecting different Phenos, with different genetical base)

i guess, just guess chances are higher to avoid this inbreeding depro.

Atleast in Landraces there are those different Phenos, or Genotypes acording my Hyphothesis, where the Enviromental Factors strictly feature certain expressions (therefore those will be different selected by indigenous Folks). And neighboring Enviroments Plants would always merge into what we call Landraces (vigorous nondepressed Landraces)

Also i take from it that selection against those mutated Plants will avoid inbreeding depro too. (Well probably goodbreeder could spot each of the new occuring Mutations, and imediatly cull them, , but who is good, so i think i play save and keep many plants, probabyl split it into groups)

 

[GMT]

Biggest problem is you won't see most mutations in the plant of origin, or its offspring. Even if it causes an observable change, you won't see it for 2 further generations. This is why you need past generations to go back to.

 

[romanoweed]

hmm. Agreed . pobably selecting them out is high amount of work. And not something for half-heated breeders

Anyway, i still would select in order to preserve so a Cultivar doesent revert back to wild.

 

[romanoweed]

Could someone recommend me a Book about overall Breeding Practices?

Something thats just going trough the normal Practices, not to extended, not too short, just something that can teach me well.

I was starting to read on some Icmag threads, was not very in depth, need just the one Book that teaches me what to do. Thanks!

 

[Felice]

Hi Romano, I just read Greg Green's Cannabis Breeders Bible. It's definitely not the most comprehensive, and a bit too focused on commercial breeding, but still a good read.

Felice

 

[The HashMan]

Could someone recommend me a Book about overall Breeding Practices?

Something thats just going trough the normal Practices, not to extended, not too short, just something that can teach me well.

I was starting to read on some Icmag threads, was not very in depth, need just the one Book that teaches me what to do. Thanks!

Gregor mandel's genetic inheritance

 

[zif]

Could someone recommend me a Book about overall Breeding Practices?

Something thats just going trough the normal Practices, not to extended, not too short, just something that can teach me well.

I was starting to read on some Icmag threads, was not very in depth, need just the one Book that teaches me what to do. Thanks!

Carol Deppe’s ‘Breed Your Own Vegetable Varieties’ is excellent for the basics (need to take the ‘s’ out of the https in that link). Just enough of the science to get a solid grounding, and tons of practical examples of breeding (veggies!).

 

[aliceklar]

Carol Deppe’s ‘Breed Your Own Vegetable Varieties’ is excellent for the basics (need to take the ‘s’ out of the https in that link). Just enough of the science to get a solid grounding, and tons of practical examples of breeding (veggies!).

Seconded re Carol Deppe's book. Really accessible but solid science behind it, and lots of principles and techniques that could be adapted to cannabis.

 

[acespicoli]

Lately I've been imagining a planet of gmo hemp plants, huge fields grown everywhere where the majority of air bourne pollen is from plants that the level of thc is less than 0.3%
Makes me wonder what that would do to wild populations of genetic diversity after a few decades ?

*
0.3%
Industry members react to the USDA keeping the allowable amount of total THC in hemp at 0.3%.
The U.S. Department of Agriculture (USDA) had its hands tied when it came to changing the legal tetrahydrocannabinol (THC) limit of 0.3% in its final rule on hemp,

 

[romanoweed]

Video About Gene loss:
https://www.youtube.com/watch?v=6Vc2bM2aQsw

 

[GMT]

Watched the vid. Deffo evolutionary rather than drift. Not all evolution is good.
if this thread is being resurrected, it may be a good place to put up a paper zif uncovered on this subject. I'll leave zif to post it. I have some concerns about the paper. But its well worth looking at.

 

[@hempy]

Video About Gene loss:
https://www.youtube.com/watch?v=6Vc2bM2aQsw

Cannabis is different to human beings one grate exsample is Hermaphroditism, also referred to as intersex and in humans a hermaphrodite is sterile were in cannabis they can reproduce.