2023 wrap-up

This year I had about 6 containers and planted about 14 plants in the yard.  My calcium tests showed mainly that calcium had little effect on end rot, but I think the watering regimen was probably the most important.  Basically if there is too much or too little, it's bad for end rot.   I think the containers exaggerate this here in Tennessee: they get so hot, come June, they dry out quickly,   Oh well.  Anyway I learned that calcium application doesn't rescue end rot in the containers.

My yard is so shaded by grown trees now that there is almost no good space for growing tomatoes.  A few plants wound up being in full shade almost all day.  They grew less and some never even set fruit.

Although my 55a7 x pBTD F1(2019) cross was a failure to obtain atv/atv + gs/gs (due to their linkage), I planted a few F2s anyway mainly in case I got a new purple or other variety that seemed nice.  So one of them does not have atv, but is nice: it has gf/gf and gs/gs and is not y/y.  It looks and tastes great.  The striping looks good on the not-y/y background - very deep orangey red stripes vs the green .  I like this better than gs on the y/y "pink" background e.g. pBTD.  This F2 is likely y/+.     I saved seeds because I liked it so much.   My shorthand for the 55a7 x pBTD F1(2019) cross is "55p".   So I will call this  "55-Stripe" -  has a nice ring to it.

My littlest tomato of 2023

 From the variety Sweet Pea Currant. 8/12/23

More calcium tests to prevent end rot

 This year I am growing 7 FL plants and testing some calcium treatment to see if I can finally reduce end rot in the Flamme plants.

I have 4 in-ground and 3 in buckets.

Plan: Beginning on Monday May 22,  administer calcium nitrate weekly each Monday either to soil as liquid or foliar spray.    I found a bulletin with data claiming Ca spray reduced BER.

Spray: 15 mM calcium nitrate + tiny bit of dishwash detergent as wetting agent.   For 2 plants in ground and 1 in bucket.

Soil:  500 ml of 50 mM calcium nitrate applied to base of plant. 1 plant in-ground, 1 in bucket.

Control: 1 in ground , 1 in bucket.

Control and Spray test plants also receive 500 mls water at same time.

I did not spray a control of any sort on the Control or Soil plants.

May 27 2023 update

 It's Memorial Day weekend 2023.  All plants are growing pretty nicely with no signs of wilt or disease, but that is typical through May.  From my past years' notes, signs of disease, if any - usually sudden wilt - emerge in the first week of June.   

Aphids:  Some plants have pretty noticeable curling and slender leaves, particularly younger leaves, and particularly on FL but not exclusively.  For example, the two 55p plants are unaffected (these are F3 plants from a cross, so maybe still enjoying hybrid vigor).    One possible cause is aphids which were quite noticeable on the plants over the last couple weeks - followed by aphid mummies indicating parasitization and natural control.   

Interestingly, the enormous oak tree which overhangs much of the backyard is I think the source of aphids.  All of the plants, and my patio picnic table and chairs, are speckled with honeydew.  (ew).  

It's 2023

 I did not blog much in late 2021.  In 2022, I did not grow tomatoes at all, for the first time in many years.

As 2023 starts, I discovered some unfortunate news about my 55a7 x pBTD cross that I began a few years ago.  My goal here was to combine purple skin and green stripe.  In 2021, I collected seeds from F2 fruit, thinking that 1/16 would be atv/atv ; gs/gs , but at least some of the atv/atv that were not green stripe might also be gs/+ and thus worth breeding out to F3 in order to homozygose gs.   

Well.  This is a fine plan under the assumption that atv and gs are completely unlinked.  What are the odds?  Turns out they are tightly linked on chromosome 7.    I got the genome locations based on close markers from separate publications.   

Green stripe:   SNP marker SL2.50ch07_63842838

(Liu et al. New Phytologist, 2020.  GREEN STRIPE, encoding methylated TOMATO AGAMOUS-LIKE 1, regulates chloroplast development and Chl synthesis in fruit)

atv:  within SL2.50ch07: 60999091–61004074

Cao et al/. J Exp Botany 2017 -  A putative R3 MYB repressor is the candidate gene underlying atroviolacium, a locus for anthocyanin pigmentation in tomato fruit)

These are about 2.8 Mb apart, which I estimate to be about 4 cM based on the Tanksley map from 1992 (Genetics).

So - this means that the F1 was atv-+ / +-gs for chromosome 7.

For an F2 to be atv-gs / atv-gs , it would have to inherit two crossover chromosomes from the F1.  Odds of each are about 2%.  Odds of inheriting both are 1/2500.

What's also bad is that although I saved some F2 atv/atv seeds, these are about 98% likely to be homozygous wild type for gs - so they are not worth breeding out to get gs phenotype.

I suppose I could plant some F3 from the largest F2 purple fruit, just to see if I can a big size purple - gf line that is bigger than my old 46A2 line.  Try #18 maybe.