Techniques6 min read
Reading the Anthurium protocols before you quote the job
An open-access chapter by Cimen Atak and Ozge Celik compiles explant choices and surface sterilization regimes for Anthurium. Here is what it states, whose results they are, and where its figures stop.
Field notes
- The chapter reports that seed propagation of Anthurium is very low in rate and not recommended, and that pollination to seed maturity plus development takes three years in a breeding program.
- Leaves are the most used explant source in the literature the chapter reviews, but its cited studies disagree on whether brown or pale green lamina performs better.
- Atak and Celik report that brown leaf explants of Anthurium andreanum shortened callus formation time and raised callus formation percentage 50% more than green leaves, in their own 2009 work.
- NaOCl at 1% to 5% is the main disinfectant across the chapter's sterilization table, with several protocols adding mercuric chloride, Benlate, gentamicin or streptomycin sulphate.
- Callus-route regeneration is associated in the chapter with reduced genetic identity and increased somaclonal variation, while axillary and terminal bud propagation is described as the most reliable for genetic stability.
Tools of the trade
Why Anthurium ends up in a lab at all
A customer asks whether you can supply Anthurium liners in quantity, and before you price anything you have to decide whether the crop belongs in your flow of vessels at all. The published literature answers part of that question for you, and it answers it crop-first rather than lab-first.
The chapter Micropropagation of Anthurium spp. sets out the conventional alternatives and dismisses both. The chapter states that the propagation rate of Anthurium by seeds is very low and it is not recommended. Stem cutting, the chapter says, is the only way of multiplying a unique individual in those circumstances, and is itself not practical at large scale.
That is the commercial case for taking Anthurium into culture. The rest of the chapter is about how much of the method is actually settled, and the honest answer is: less than a table makes it look.
What the source actually compiles
It is a review rather than a single experiment: every figure in it belongs to the study it is drawn from, with that study's genotype and conditions attached. The chapter is free to download in full.
The authors work from the five-stage scheme they attribute to George et al. On Stage 2 and Stage 3 they say success depends on plant species, cultivar or genotype, plant growth regulators, the ingredients of the medium and physical culture conditions. On Stage 4 they write that acclimatization needs to be well controlled to avoid loss of propagated plants.
Explant
Atak and Celik achieved to decrease the callus formation time by using brown leaf explants and induced the callus formation percentage 50% more than performed by green leaves.
Surface sterilization
NaOCl is the main disinfection material used in establishing aseptic culture conditions of Anthurium. The table lists, among others:
Anthurium andreanum leaf: 0.6% Benlate for 30 minutes, then 70% ethanol for 30 seconds, then 1.5% NaOCl with two drops of Tween 20 for 20 minutes.
Anthurium andreanum leaf: 70% ethanol for 1 minute, gentamicin for 30 minutes, then 20% v/v commercial bleach (5% NaOCl) for 12 minutes.
Anthurium andreanum L.
Spadices: 30 to 60 minutes under running tap water, a 1% pesticide solution of 50% benomyl and 20% streptomycin sulphate for 30 minutes, five distilled water rinses, 1% NaOCl for 10 minutes, 2% NaOCl for 5 minutes, 80% alcohol for 30 seconds, then five to six further rinses.
it is necessary to establish a suitable procedure for each varieties of Anthurium that can be adapted to commercial production — Cimen Atak and Ozge Celik, Micropropagation of Anthurium spp., IntechOpen, 2012
Why it works, as far as anyone knows
The chapter's underlying argument is about route, not recipe. It separates propagation from axillary or terminal buds from propagation by adventitious shoots or adventitious somatic embryos, and it separates direct regeneration from indirect regeneration through a callus phase. Where propagation occurs via an indirect callus phase, the authors write, the genetic identity of the progenies decreases, callus formation increases somaclonal variation, and a long term period of callus growth raises the incidence; the origin of the callus also causes somaclonal variation. Propagation from axillary or terminal buds they describe as the most ensurable method for genetic stability.
That matters commercially, because the brown-leaf results above are callus results. A protocol tuned to make callus faster is a protocol that spends longer in the phase the same chapter associates with variation. The chapter does not offer a mechanism for why brown lamina performs differently from green, and it does not reconcile the disagreement between Martin, Viegas and Bejoy. What it concludes instead is that different genotypes had different responses to the same culture conditions.
The meristem and shoot tip cultures are used to establish virus-free plant culture. That is the authors' framing of the method's intent. The sterilization table addresses surface contaminants on the explant; nothing in it indexes or tests a mother plant, and the chapter describes no indexing procedure at that point.
Verify this
What a sterilization table cannot tell you
Table 1 gives concentrations, sequences and exposure times. It does not give explant size, mother plant condition or season, the resulting contamination rates, or how many jars each lab pulled at the first transfer. Two of the entries use mercuric chloride and one uses an antibiotic in the wash, and the table carries no handling, protective equipment or waste guidance for any of them. Check what your own institution and local rules permit before you copy a line out of it, and read the primary paper rather than the table row.
Before you try it
Three checks are worth making before this chapter changes anything on your bench.
Match the genotype, not the species. Every result above is stated for a named genotype or cultivar — Anthurium andreanum, Anthurium andreanum Hort, cv Rubrun — and the chapter's own conclusion is that a suitable procedure has to be established for each variety. A protocol that performed on one breeder's line is a starting hypothesis for yours, not a specification.
Read the media section in the original. The chapter continues past the sterilization table into culture medium, organic compounds, vitamins and plant growth regulators, and those sections carry their own cited numbers. No basal medium, cytokinin or auxin concentration appears in this piece, because the ones that matter should be read with the study and genotype they came from attached.
Do not carry a multiplication rate across from here. Nothing in this piece states a multiplication rate, a rooting percentage or an acclimation survival figure for Anthurium. When you take one from the literature, record the genotype, the vessel and the stage it was measured at next to it, and keep your own transfer and acclimation losses in the same place — logging what you observe is not the same thing as reproducing someone else's result.
Further reading
Where to read both papers
The chapter is free in full: Micropropagation of Anthurium spp. on IntechOpen, by Cimen Atak and Ozge Celik.
Its figures are not reproduced here; read them with the system, genotype and immersion schedule the authors used.
From the bench to the books
Run the lab on records, not memory
Sources
References and credits
- Micropropagation of Anthurium spp.Official source · IntechOpen · Open-access book chapter by Cimen Atak and Ozge Celik, published 17 September 2012, DOI 10.5772/51426. Every explant, sterilization and somaclonal variation statement in this piece comes from it.
- Assessment of different temporary immersion systems in the micropropagation of anthurium (Anthurium andreanum)Official source · PubMed Central · Linked as further reading on temporary immersion. No figure or result from this paper is reported in the piece.