Seeds of South Australia
Nicotiana sp. Corunna (D.E.Symon 17088) (Solanaceae)
Corunna Tobacco
List of species for Nicotiana
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Seed collecting:
October to December
Herbarium region:
Eyre Peninsula
NRM region:
Eyre Peninsula
AVH map:
Australian distribution map (external link)
SA Census:
Census of South Australian plants (external link)     [genus Nicotiana]
Name derivation:
Nicotiana named after Jean Nicot (1530-1600), a French Ambassador for the King of France to Lisbon in 1560, who sent the first tobacco plant to France. Corunna named after Corunna Station, north of Iron Knob in South Australia, where the species was first collected from.
Distribution:
Endemic to South Australia and found in a few locations, around Port August, growing in sandy or stony loamy soils in Creeklines and hillsides.
Status:
Native. Rare in South Australia.
Plant description:
Erect herb to 1 m tall with more or less glabrous stems and leaves. Leaves radical and cauline, mos lanceolate. Inflorescence erect few branching spike with tubular flowers, white inside and cream, green or purple tinged outside.
Fruit type:
Brown ellipsoid to ovoid capsule.
Seed type:
Brown reniform seed to 0.7 mm long and 0.5 mm wide, covered in wrinkles.
Embryo type:
Linear fully developed.
Seed collecting:
Collect mature capsules, those that are brown or turning a pale straw colour and contain brown seeds. Can collect individual capsules or break off the whole fruit spike.
Seed cleaning:
Place the capsules in a tray and leave to dry for one to two weeks. Then rub the capsules gently by hand to dislodge the seeds. Use a sieve to separate the unwanted material. Store the seeds with a desiccant such as dried silica beads or dry rice, in an air tight container in a cool and dry place.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
Aug-1590%7 d7 d 500 mg/L gibberellic acid 48 h;
1% agar;
Incubated under spring/autumn conditions
Aug-1588%7 d7 d
1% agar;
Incubated under spring/autumn conditions
Aug-1582%7 d7 d 500 mg/L gibberellic acid 48 h;
1% agar;
Incubated under winter conditions
Aug-1544%7 dNA
1% agar;
Incubated under winter conditions
Result: Maximum percentage of germination observed.
T0: Number of days before first germinant observed.
T50: Number of days to achieve 50% germination.
Pre-treatment: The initial treatment that the seeds received prior to placement on germination media.
Germination medium: The substrate that seeds were placed on for the duration of the germination experiment.
Incubator conditions:
Photoperiod: The duration of light exposure that the seeds were subject to during a 24 hour period.
Thermoperiod: The constant or diurnal temperatures that seeds were subject to during a 24 hour period.
Winter conditions: 15°C 20 h (3am→11pm); 5°C 4 h (11pm→3am) / 10 h light (8am→6pm); 14 h dark (6pm→8am)
Spring/Autumn conditions: 22°C 12 h (8am→8pm); 10°C 12 h (8pm→8am) / 12 h light (8am→8pm); 12 h dark (8pm→8am)
Summer conditions: 30°C 14 h (6am→8pm); 15°C 10 h (8pm→6am) / 14 h light (6am→8pm); 10 h dark (8pm→6am)