Author Topic: Dominance of flower colours in phaseolus vulgaris?  (Read 399 times)

Ferdzy

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Dominance of flower colours in phaseolus vulgaris?
« on: 2020-07-24, 04:56:10 PM »
A few years back, we found a cross between Blue Lake and Cherokee Trail of Tears beans. We have been growing them out, in the hopes of getting a bean that looks and tastes like Blue Lake, but has more resistance to anthracnose, like CToT. Early on, I realized that keeping track of which ones were which might be difficult, given that we are selecting for a resemblance to Blue Lake.

Fortunately, some of the resulting offspring had pink flowers, which I thought would be a good way to differentiate between the two strains. Half the seeds we planted this spring were collected from white flowered and purple flowered (which turn out to have purple pods) plants. The other half of the seeds we planted were collected from pink flowered plants, of which we had only 3 or 4 - maybe 5% of the total plants grown.

To my chagrin, of the approximately 60 seeds we planted that were collected from the pink flowered plants, it looks like 7 are going to have flowers in some shade of pink (no purples). Given that the pink flowers were relatively uncommon to start with, I was operating on the assumption that they were recessive, but plainly it's not that simple. You can get a stable pink-flower producing variety, because they exist. Can anyone explain to me, in fairly simple terms, what is happening here?


Edit: Okay, just went and tied pink string around pink flowering vines. There's 9 of them at this point.
« Last Edit: 2020-08-15, 02:03:19 PM by Ferdzy »

Ferdzy

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Re: Dominance of flower colours in phaseolus vulgaris?
« Reply #1 on: 2020-08-30, 06:56:02 AM »
Okay, not about flower colour specifically, but we had a cross show up this year that I'm very excited about. It appears to be ((Octarora x Cherokee Trail of Tears) x (Blue Lake x Cherokee Trail of Tears)).

It came up in the Octarora patch, and stood out as having a plain green, round bean, and lots of them. LOTS. It looked really amazingly like Blue Lake. It grew at least 15' and had beans at almost every node, in spite of the fact that after we picked the first one, we didn't pick any more. That first bean was extremely nice - milder than Blue Lake, but still very tasty. It appeared to have very good anthracnose resistance in spite of the fact that once I noticed it I came by and fondled it about three times a day.  ::) It has very attractive pink flowers. So! everything I want in a bean, it looks like! Well, almost. It's got that CToT black seed and I would have preferred a light coloured one.

I've noticed that pink flowers and black seed seem to go together like red hair and freckles. Yes, you can get them separately, but they like to stick together.

This is the F1 so there is some faint hope that lighter seeds will appear on a subsequent grow-out, along with all kinds of other variations that I may or may not want. However I will, as they say, be following its career with interest.