Agriculture Reference
In-Depth Information
Notes
1 These footnotes have been added by P. Bouloc. Definitions are taken from the Petit Larousse .
2 A cultivar is a plant variety resulting from a selection, mutation or hybridization (whether occurring
naturally or provoked) and cultivated for its agronomic qualities.
3 This method is similar to the creation of a population with a broad genetic base, allowing work to be con-
ducted without the risk of impoverishing the variability of the population necessary for constant progress.
4 Which still does not exist, as no one knows how to produce it at a reasonable cost.
5 This is no longer the case today. This route is too complicated and without any real advantage, as several
generations are required in order to produce industrial quantities of seed.
6 Chimera: organism consisting of two (or, rarely, several) cell types with different genetic origins.
7 Hemp is naturally a dioecious plant. The monoecious variety is a mutation that has taken on a significant
selective advantage.
8 The French catalogue uses the term DHS, whereas the English use the term DUS (distinctness,
uniformity and stability).
9 See later in the chapter for further discussion of this point.
10 The figures presented are copies of gas phase chromatographs (GPCs). The GPC allows the constituent
parts of a sample to be separated and their concentrations calculated. In this case, THC is being tested.
In this example, the different cannabinoids found in hemp are being separated. The equipment is regulated
so as to separate out these constituents, while excluding as many non-cannabinoids as possible.
For any given setting of the machine, each component will have a set retention time. This results in
it being detected at precise times (as shown on the graph). The abscissa represents time in minutes and
allows the identity of each component to be determined.
The purpose of the analysis is to control the concentration of each constituent. The ordinate shows
the intensity of the signal in mini-volts. The regular use of a control allows the intensity and weight of the
constituent to be checked and correlated.
By dividing the recorded intensity of the chosen constituent by the intensity of the reading recorded for
the same constituent when injected at a precise dose, it is possible to determine precisely the concentra-
tion of the constituent in any given sample.
Hemp is classified easily according to its psychotropic potential (see text). This classification is based
on the relative concentrations of two or three cannabinoids (CBD, THC and CBG). The graphs produced
show several different types of hemp: one variety with as much THC as CBD (intermediary drug), one
sample with high concentrations of CBD and little THC (fibre type), a third sample with no THC but with
CBG and a fourth sample of hemp with none of these cannabinoids.
11 For more on this subject please refer to Chapter 3, 11 and 16 of this topic.
12 Refers to the French market only.
13 Work conducted at the offices of Plant Research International (PRI) in Wageningen, the Netherlands.
 
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