Acacia confusa

Propagation

Germination

Most Acacia possess physical dormancy.[1][2]

In A. tortilis, removal of the protrusion with nail clippers results in the highest germination rate (94%) compared to sanding+boiling water (32%), boiling water (5%), sanding+sulfuric acid (86%), sulfuric acid (85%), sanding (21%), no treatment (6%). The authors suggest that the lack of success from boiling water alone, which was more successful in previous studies, might be due to the limited amount of water used (~60mL for 50 seeds). Similarly, their sanding might not have penetrated deep enough into the seed coat.[1]

In A. etbaica, A. gerrardii, A. origena, A. ehrenbergiana, and A. asak germination speed and rate were generally enhanced by abrasion and acid scarification compared to hot water immersion or no treatment, but there was significant variation among treatments and seed source.[2]

Vegetative

In-Vitro

Cultivation

Harvest

Yield

Soilless

Soil

Fertilization

Temperature

Lighting

Pests

Ecology

Morphology

Confusa can have several (geno/pheno)types present in the seedlings of a single tree: Slow-growing dwarfs with short nodes and broad phyllodes, green stem. red stem, and pinnate or spur-like second eophyll. In this study, the variation is likely the result of open pollination by trees at least 100 meters away.[3]

Roots

Stem

Leaves

Inflorescence

Seeds

Phytochemistry

Infraspecific Variation

Biosynthesis

Distribution

Timecourse

Improvement

Identification

Inheritance

Methods

History & Society

Work Log

23 Jun 2022

11 Apr 2022

09 Jun 2022

29 Mar 2022

The second seedling seems to have not been hindered by the weird development.

21 Mar 2022

The second seed has fallen over.

17 Mar 2022

Germ01 is progressing to the seedling stage.

Second germination has occurred.

15 Mar 2022

The first seed has germinated. That was fast.

08 Mar 2022

Started 6 seeds today from WSS. Sterilized in 70% ethanol for 2 minutes then 0.6% sodium hypochlorite + Tween 20 for 15 minutes. Clipped the small protrusion at the end with wire snips. Sown on 1:1 v/v sand:coir mix. Covered with 3-5mm mix. Placed in 30°C incubator.

Bibliography

1. Hanaoka*, So and Nakawa, Norio and Okubo, Norihisa and Omondi, Stephen Fredrick and Kariuki, Jason, Seed Pre-Treatment Methods for Improving Germination of Acacia Tortilis, African Journal of Biotechnology, vol. 13, no. 50, pp. 4557--4561, December 2014. doi: 10.5897/AJB2014.14223. Abstract
   Acacia tortilis (Forsk.) Hayne is considered as an important dryland tree species in Africa and Middle East, and establishing an effective and efficient seed-germination method is considered necessary for producing planting materials. In this study, new germination method was compared with some of the previously reported methods and evaluated in A. tortilis. In the new method, root setting was observed within 3 days and the final germination percentage was 94\%; higher than 5 to 86\% reported in the previous methods. New method is therefore considered to be suitable for geminating A. tortilis seeds. Key words: Acacia tortilis, seed germination, pre-treatment of seed germination.
2. {Aref}, Effects of Seed Pretreatment and Seed Source on Germination of Five Acacia Spp., African Journal of Biotechnology, vol. 10, no. 71, November 2011. doi: 10.5897/AJB11.1763. Abstract
   The effects of seed pre-sowing treatment and geographic source of seeds on three germination parameters of five Acacia species (GP = germination percent; GMT = germination mean time (days) and GI = germination index) were studied. Pre-sowing treatment included immersion in concentrated sulphuric acid for 5, 10 and 15 min; immersion in hot water for 2, 4 and 6 min; abrasion of the seed coat and control. Seeds were collected from three geographical regions in the Kingdom of Saudi Arabia (Aseer and Al Baha regions in South-Western and Al Madinah region in the West). Experiments were carried out on Petri dishes containing moistened filter papers and incubated in a growth chamber. Seed pretreatment significantly (P {$<$} 0.0001) affected GP, GMT and GI in all tree seed species studied. Generally, scarification (acid and mechanical abrasion) resulted in the best GP, GMT and GI. Hot water also gave good germination for most tree seed species. Germination behavior of A. ehrenbergiana seeds was different compared to other species. More also, increasing the time of immersion in acid decreased the GP in seeds collected from both Aseer and Al Baha regions, while in contrast, A. origena germinated better with increasing time of immersion in acid and hot water. Geographic source of seeds significantly affected most germination parameters, although it was comparatively inconsistent compared to seed treatment. Highly significant interactions (P {$<$} 0.0001) were recorded between seed pretreatment and seed source.
3. Li, Siao-Jong, Seedling Variation of Open-Pollinated Seeds from a Single Tree of Acacia Confusa Merr., Kew Bulletin, vol. 32, no. 3, pp. 537--539, 1978. doi: 10.2307/4109655. Abstract
   The seedling characters of Acacia confusa observed in this study were: (1) dwarf seedlings, (2) seedlings with green stem, (3) seedlings with pinnate second eophyll, (4) continuous variation in the length of the reduced second eophylls. The inheritance of these characters was assumed and discussed. The natural crossability of this species was also calculated.