DANIEL BURSON 2016

[carolyn137]

Originally Posted by kath

Daniels is a potato-leaved variety; Indian Stripe is the regular leaf parent. Btw, all the seeds you sent to me were PL. I started later than normal this year but so far so good.

kath

Correct, and DB is a stable variety,so where do the occasional RL plants come from and that's little more complicated.

Let P=PL, let p= RL

PP is homozygous, dominant and PL
Pp is heterozygous and PL since P is dominant
pp is homozygous recessive and RL

No crossing is needed,rather, a single spontaneous mutation in the seed DNA and it does happen. Such single spontaneous mutations are permanent and heritable

Take Cherokee Purple as an example.

CP is RL,and there are three versions that are PL

Spudakee
Cherokee Purple Potato Leaf
Whoops,I forgot the 3rd one,not a problem.

There are those who have grown out CP and the three PL versions at the same time in the same summer,and all do NOT agree that the PL versions are the same as the original RL except for leaf form.

Take Kellogg's Breakfast,KB, the PL version is KBX, found by Martha Hufford,and almost all agree that they are the same except for leaf form.

Take Indian Stripe,RL, and the PL version ISPL,almost all agree that the only difference is leaf form.

What a single spontaneous mutations in seeds can do is to cause problems in the sequencing of the DNA and cause what are called inversions,repeats,looping out,etc.,and if leaf form alleles are affected,it can then change the phenotpe,what the leaf form looks like,to a different phenotype.

Single spontaneous mutations are also heritable. So anyone with a DB RL who saves seeds should get all RL plants as long as there's been no crossing..

The chances of going from PL to RL are low , thus few RL's for a variety that is PL, but it can and does happen.

I hope that helps,

Carolyn