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1

Sonntag, 23. Mai 2021, 14:53

Tipp für die Aussaat von Amorphophallus

The sowing of amorphophallus is not particularly complicated and is regularly fast.
Herewith I share a tip to get better germination rate and especially stronger seedlings: the scarification. The seed coat should be cut locally with a clean nail clipper or knife. Of course, the hypocotyl (bud) must remain undamaged.
That seems barbaric, but the method actually works quite well.

The publication "The Effects of Scarification on Seed Germination of Porang (Amorphophallus muelleri)" by Harijati1 and Widoretno(https://aip.scitation.org/doi/pdf/10.1063/1.5061841 in English) details everything.

This method has 2 major advantages:
- a better oxygen supply and therefore better development of the hypocoty.
- you can tell immediately whether the seed is still fresh. If it is wood-hard or purulent, it can be thrown away.
To date, I have used this method for A. paeoniifolius, prainii and villosus without any problems.
I have not observed any piltz infection, although the soil has not been disinfected. Finally, when sowing amorphophallus, the most difficult is to find fresh and healthy seeds!

2

Sonntag, 23. Mai 2021, 16:12

Hello tomaturge,

thanks for the tip and the link to the paper.

Your last sentence actually points to the biggest problem with Amophophallus seeds, namely that you should get fresh seeds as soon as possible - because with a few exceptions, araceen seeds are hardly storable (I recently reported on an unpleasant example: Sources of supply for aron rods)

Nevertheless, I would not consider the article to be too meaningful, because
- it is not explicitly shown how the seeds were cut with the nail clipper
- in results and discussion it is pointed out that in none of the seed trays 100 % of the seeds are germinating, nevertheless the graph for nail clipper and H2SO4 shows 100 % and no standard deviation; that can't really be true
- the evaluation after three weeks may simply be too early to say that the other variants are worse in terms of the number of growing plants after e.g. 6 weeks.

I have never filed or cut amorphophallus seeds or anything like that; the danger of rot would be too great for me.

Semen sterilization is also not conclusive for me, because e.g. in tissue culture, alcohol treatment is done first to remove waxes and fats and hypo-chorit treatment (Cholrox) follows after that; in the case of the latter, unfortunately, the indication of the concentration (whether undiluted or diluted) is also missing.

How exactly do you do that with cutting the seeds, tomaturge?

Happy growing, Bernhard.

3

Sonntag, 23. Mai 2021, 17:30

I regularly do exhibits for different types of peppers, so I'm used to scarification.


My method for amorphophallus is simple, I use a sharp knife to cut the seed coat on the long side max. 2x3mm, twice on a seed. The cut must be superficial, clean and straight.
This is what it has to look like: https://www.dirtonmyhands.com/files/star...rified-seed.jpg
Source: https://www.dirtonmyhands.com/seed-germi...ds-indoors.html

4

Sonntag, 23. Mai 2021, 17:32

Thanks for the interesting link !

Happy germinating, Bernhard.

5

Sonntag, 23. Mai 2021, 17:53

Scarification does not particularly increase the germination rate, but it is always high as long as the seed grains are fresh. The advantage is to get stronger seedlings.
Diluted H2SO4 is another method of scarification, typical for seeds with hard seed coats, e.g. Passiflora. In amorphophallus, the embryo is not particularly encapsulated, the strategy is not to free it, otherwise to stress the endosperm and therefore to optimize the supply of nutrients.

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