Expression of the High Oleic Trait Peanut Notes No. 224 2020
Please elaborate on Maria’s statements below about low temps affecting high oleic oil concentration. What can be done about this?
I will look but my understanding is that it is more about maturity as affected by cooler temperatures than the cold weather directly affecting expression of the trait. There is a considerable amount of work showing that immature peanuts do not express the trait at levels as high as more mature peanuts. Orange/rust colored peanuts will have a lower O/L ratio than brown or black pods. So, there is concern when people dig too soon or in this case when weather keeps us from reaching optimum maturity that a load of peanuts will not be considered high oleic. This does not affect yield or market grade (Bailey vs Bailey II) at a comparable level of maturity but would be an issue at the shelling and manufacturing level for the uniformity of the products they sell. Right now, I do not think the shellers are segregating Bailey versus Sullivan (normal OL versus high OL) but by 2022 we should have a shift to all high OL varieties because Bailey II will replace Bailey to go along with Sullivan and Emery (two high OL varieties.)
I will take a look at Maria’s post.
Jordan Follow Up:
What I provided below is a part of it. But Maria’s post suggest that even if the peanuts increase in maturity through the color designations, expression of the trait may be lower depending on the temperatures in which they progressed. I will follow up with Maria. This is an issue but there is nothing we can do now except let the crop mature as much as possible within our logistical constraints.