Characterization of Partial Resistance to Black Spot Disease

A meeting place for rose breeders.
henry kuska
Posts: 949
Joined: Thu Dec 15, 2011 9:06 pm

Characterization of Partial Resistance to Black Spot Disease

Post: # 64975Post henry kuska
Fri Feb 03, 2017 3:22 pm

" This suggests that the development of rose cultivars with high levels of stable partial resistance to black spot is a feasible approach for the rose industry."

See: ... tract?etoc

david zlesak
Posts: 372
Joined: Tue Nov 26, 2013 12:27 pm

Re: Characterization of Partial Resistance to Black Spot Dis

Post: # 64978Post david zlesak
Sat Feb 04, 2017 11:18 pm

They did nice work. It is similar to what Vance Whitaker and Stan Hokanson did a few years back as well. Vance and Stan focused on combining ability and reporting their results as "general combining ability" explaining more than "specific combining ability" for black spot resistance. In other words, it seemed predictable that parents with high horizontal resistance tended to produce seedlings with average higher horizontal resistance. If "specific combining ability" was found to be the case, then it would be more unpredictable to find high horizontal resistance in seedlings and a person would just need to try more combos to find the specific combos that would provide high levels of it.

The study in Texas found predictability as well and found moderate heritability, which is great. Heritability is another way to showcase more specifically the kind and extent genetics serves in breeding for a trait.

Horizontal resistance (when infected with black spot roses can slow the growth of the fungus) is a good thing to aim for as it seems much more durable than race specific resistance. Of course, the best is to combine both.

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest