Yoshimatsu Kayo, Iida Osamu, Kitazawa Takashi, Sekine Tsutomu, Kojoma Mareshige, Makino Yukiko, Kiuchi Fumiyuki
Kokuritsu Iyakuhin Shokuhin Eisei Kenkyusho Hokoku. 2004(122):16-20.
Growth characteristics of Cannabis saliva L. are indispensable factors to verify the statements by the criminals of illegal cannabis cultivation. To investigate growth characteristics of C. sativa, two varieties, cannabidiolic acid (CBDA)-rich (CBDA-type) which being cultivated for fiber production and delta9-tetrahydrocannabinolic acid (THCA)-rich (THCA-type) which is used for drug abuse, were cultivated from seeds under the same growth environment in a phytotron. THCA-type showed high germination rate (100%) whereas only 39% of the CBDA-type seeds germinated 6 days after sowing. Plant height, number of true leaves, number of nodes, number of axillary buds and flowering of these two varieties were periodically observed. THCA-type grew more rapidly (plant height: 125.8 cm for THCA-type, 84.7 cm for CBDA-type, 75 days after cultivation) demonstrating vigorous axillary bud formation and earlier male-flowering (63 days for THCA-type, 106 days for CBDA-type, after sowing). Propagation of THCA-type was tested using the axillary shoot cuttings of female plants either with or without the main stem. All the cuttings with the main stem rooted after 21 days and grew healthily in a phytotron. However, all the newly developed leaves were single instead of palmate. In the field, THCA-type male-flowered after 155 days of cultivation after sowing on March 31. The height of the field-cultivated plants reached 260.9 cm 163 days after sowing. Despite the great differences in final plant heights, the increases of plant height per day during the vegetative growth stage were similar in the field and in the phytotron. Thus estimating the starting time of illegal cannabis cultivation might be possible if the plant is in the vegetative growth stage.
大麻的生长特性是核实非法种植大麻罪犯口供的不可或缺的因素。为了研究大麻的生长特性，在人工气候箱中，将用于纤维生产的富含大麻二酚酸（CBDA）的品种（CBDA型）和用于药物滥用的富含Δ9-四氢大麻酚酸（THCA）的品种（THCA型）这两个品种的种子在相同生长环境下进行培育。THCA型发芽率高（100%），而CBDA型种子在播种6天后只有39%发芽。定期观察这两个品种的株高、真叶数、节数、腋芽数和开花情况。THCA型生长更快（种植75天后，THCA型株高为125.8厘米，CBDA型为84.7厘米），表现出旺盛的腋芽形成和更早的雄花开放（播种后，THCA型为63天，CBDA型为106天）。使用带有或不带有主茎的雌株腋芽插条对THCA型进行繁殖试验。所有带有主茎的插条在21天后生根，并在人工气候箱中健康生长。然而，所有新长出的叶子都是单叶而非掌状叶。在田间，3月31日播种后，THCA型在种植155天后雄花开放。播种163天后，田间种植的植株高度达到260.9厘米。尽管最终植株高度差异很大，但在田间和人工气候箱中，营养生长阶段的每日株高增加量相似。因此，如果植物处于营养生长阶段，估计非法大麻种植的起始时间可能是可行的。
