So this is the one that was going to be about Anthurium genetics, but I've realized that even though I've read a bunch in the book and elsewhere, fairly carefully even, I still can't entirely grasp what's going on. It doesn't help that the book is almost 20 years out of date, and that even more complicated explanations are sitting out there on the internet, taunting me with even more details I don't understand, but I suspect the main problem is that I don't have any actual training in genetics, so everything I understand about how genes work is self-taught. That works out okay when it comes to concepts, but I get lost quickly when the specialized vocabulary gets going.
This is uncomfortable. It's especially uncomfortable because I understand enough of the individual pieces that I feel like I ought to be able to understand the whole. And also because understanding what was going on genetically was the whole reason I bought the book1 in the first place.
Specifically, I wanted to understand #097, "Colin Ambulance," to whom you were introduced in Part 1. Here's Colin again, to refresh your memory:
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And here is Colin's seed parent, the NOID purple:
Even taking into account that I don't know who the pollen parent was, it would be hard for me to find a more
opposite-colored mother/daughter pair. Aside from 'White Gemini,' I don't even have any varieties that are this light, and 'White Gemini' is probably not the pollen parent.
2 But then, most of the NOID purple's children don't look much like her. Here are the six known offspring to date:
Clockwise from top left: #046 ("Aurora Boreanaz"), #097 ("Colin Ambulance"), #110 ("Delta Badhand"), #202 ("Mason Pepperspray"), #200 ("Mario Speedwagon"), #108 ("Deena Sequins")
Now, Mario looks enough like his mother that it'd be easy to guess that they were related even if you didn't know. And although Aurora and Deena don't look much like their mother on first glance, that slight purple tint to the spadices would give away the relationship if you stared at them long enough. Maybe even Delta. But it's been a mystery to me how Colin and Mason happened.
Not to spoil the ending, but -- it turns out that that's just how it goes with
Anthuriums, a lot of the time. The children don't necessarily resemble their parents very much. Not only do
Anthuriums have multiple pigment-making genes, but the expression of those genes is moderated by other genes, one of the pigment genes makes the starting material that the
other pigment genes work on,
3 and some pigments mask the appearance of other pigments. Put all those genes and their interrelationships into a cross and mix themselves up, and you can cross spathe color A with spathe color Z, expecting to get spathe colors in between A and Z, like C, L, and W, and instead wind up with spathe colors ΓΌ, ¿, and ♂. (Though sometimes you also end up getting F, F, and more F -- even the unpredictability is unpredictable.)
The pigments involved in
Anthurium spathes are
pelargonidin (orange),
cyanidin (red),
peonidin (purple),
4 and
chlorophyll (green). These colors may be produced in varying quantities, depending on the genes that determine how much pigment to make. So cyanidin is responsible for red spathes, as you'd expect of a red pigment, but it's also (usually) the pigment in pink spathes, just in a lower concentration. Same thing goes for pelargonidin, which can be coral
5 or orange; chlorophyll, which can be varying intensities of green; and peonidin, which changes color depending on the pH where it is, and how much of it there is, but runs from pink to purple.
6 The varying intensities of color, in varying combinations, give us all the different possible colors of spathes.
7
Pelargonidin, cyanidin, and peonidin are all either being made or not being made, under the direction of one gene for each, and then another gene influences how
much is made. (It looks like each pigment has at least one corresponding intensity gene, though I may be misunderstanding that.) But the point is that when you shuffle the pigments around during pollination, sometimes the intensity genes get shuffled around too, and a red crossed with a red may yield a pink, for example.
And the genes influence one another, besides. The gene for "make red pigment" I think uses orange pigment as the starting material; that is, it produces orange pigment, then turns some of it into red pigment. So unless I've misunderstood something badly,
8 you can't have a red spathe unless there are genes present for making both orange and red. Add to this the possibility that plants with peonidin in them may have different pH in the spathes, and consequently may be producing different colors out of the same genes, and the tendency of red pigment to mask the presence of orange or green pigment, and you can see how variable things might get. The authors of the book at one point crossed two pinks together and wound up with, by their count: 5 bright red, 19 red, 42 light red, 4 dark pink,
9 7 pink, 2 orange, 21 coral, 10 light coral, 1 white with a touch of pink,
10 and 29 white.
So you can see how complicated and frustrating being an
Anthurium breeder could be, even before you factor in the consequences of randomly pollinating everything with whatever's handy.
Since I haven't been able to do much deliberate crossing, due to the fact that
Anthurium inflorescences don't spend that much of their lifetimes shedding pollen or accepting pollen, and the fact that up until pretty recently I didn't have that many plants blooming at once, the semi-unpredictability isn't that big of a problem. It's tough to be frustrated by things standing in the way of your goals when you aren't working toward any particular goals. (In fact, so far, it's been plenty exciting to find out that I can make seedlings at all -- none of the houseplant books talk about growing
Anthurium from seed.
11) I've basically been a toddler mixing together all the finger-paints and seeing what happens. New colors! New shapes! Cool!
A comparison of the darkest (#005 "Chad Michaels") and lightest (#097 "Colin Ambulance") seedlings I've gotten so far.
And I'm likely to continue finger-painting for a while: I just don't have the facilities to determine what genes I'm working with. In the book and the paper both, the procedure for figuring out what they had was that they just made deliberate crosses between two plants, however many times were necessary to get enough seedlings to be statistically relevant, and then they just grew them all out and counted the colors at the end, for as many different varieties as necessary. Which, we're talking about 75-100 seedlings for each cross, and doing a single pair of plants doesn't tell you much about either plant's genes: you have to compare what you get when you cross each of those two plants with a bunch of others. With 13 cultivars in my founding population here,
12 that's 91 different possible combinations, with each combination producing, say, 75 seedlings, and at
minimum, I'm stuck growing out almost 7000 seedlings for two years just to be able to make reasonable guesses about the genetics of what I have. In the meantime, new seedlings have arisen that I will probably also be interested in using for future breeding, so I'd need to cross some of those out as well, to determine what genes they wound up with. So breeding everything out until I understand what genes are present doesn't work. And genetic sequencing is way too expensive, plus I don't think the relevant genes have even been identified, so having the sequences wouldn't necessarily do me any good even if sequencing
were affordable. I'm just doomed never to understand exactly what's going on.
So, you know. Fuck it. I might start getting a little more careful with the crosses, and aim in certain directions (In particular, I would love to create a decent-sized, blistered, dark purple spathe, or any green spathe at all,
13 especially if the leaves were nice, too.
14), but we're probably looking at more finger-painting. Which is fine. If I've learned anything from all this, it's that it's relatively easy to get new colors; the hard part is getting new colors
on purpose.
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A composite photo of the best picture I've gotten so far for each of the 40 seedlings that had produced a finished bloom, as of 4 June. It's more impressive at full size, should the reader be considering opening it in a new window.
(► indicates seedlings making their first photo appearance on the blog in the mid-June posts)
First column, top to bottom: 005 ("Chad Michaels"), 066 ("Barbara Seville"), 108 ("Deena Sequins"), ►125 ("Anya Wei"), ►232 ("Rhoda Badcek"), ►231 ("Rhea Listick"), 245 ("Sawyer Ad"), 235 ("Rowan DeBoate").
Second column: ►097 ("Colin Ambulance"), 059 ("Bijoux Tuit"), 126 ("Erin Dirtylondry"), 031 ("Sylvester"), 223 ("Patty Cake""), ►244 ("Sara Problem"), 116 ("Eileen Dover"), 282 ("Dave Trading").
Third column: 046 ("Aurora Boreanaz"), 035 ("Alyssa Edwards"), 076 ("Bob Humbug"), 200 ("Mario Speedwagon"), 276 ("Zach Religious"), 243 ("Sal Monella"), 271 ("Wanda Reulthemal"), 234 ("Ross Koz").
Fourth column: 026 ("Peaches Christ"), ►283 ("Anne Pursand"), 239 ("Russ Teanale"), 149 ("Heather Boah"), ►216 ("Gillian Jamm"), 280 ("Jujubee"), ►247 ("Selma Carr"), 273 ("Wes Coast").
Fifth column: ►083 ("Carmen Adairya"), 063 ("Audrey Quest"), ►202 ("Mason Pepperspray"), 085 ("Carson Trucks"), 238 ("Rudy Day"), ►110 ("Delta Badhand"), 118 ("Elijah Sturdabowtit"), 275 ("Yvette Horizon").
Coming up in Part 3: what sorts of things do
Anthurium breeders care about, and why? (This will probably take me several days to do, since there are ongoing family things happening, and it's a complicated subject besides. I hope to get a product review post in before Part 3 as well, but we'll see what I'm capable of.)
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