Acid scarification and hot water soaking of <i>Racosperma auriculiforme</i> seeds

Khasa, P. D.

doi:10.5558/tfc69331-3

Cited by 9 publications

(4 citation statements)

References 1 publication

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“…Other recordings of gradual germination after HW or BW treatments in the Caesalpinioideae and Mimosoideae have been made by Clemens et al (1977), Tran (1979;A. sophorae), Odoemena (1988), Burrows (1991), Khasa (1993) and Burrows et al (2009). In contrast, other studies have shown rapid imbibition after HW or BW treatments, e.g.…”

Section: Imbibition -Hw-treated Seedsmentioning

confidence: 99%

Markedly different patterns of imbibition in seeds of 48 Acacia species

2019

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The seeds of most Australian acacias have pronounced physical dormancy (PY). While fire and hot water (HW) treatments cause the lens to ‘pop’ almost instantaneously, for many Acacia species the increase in germination percentage can be gradual. If PY is broken instantly by HW treatment, why is germination often an extended process? Control and HW treatments were performed on seeds of 48 species of Acacia. Seeds were placed on a moist substrate and imbibition was assessed by frequently weighing individual seeds. In the two soft-seeded species all control seeds were fully imbibed within 6–24 h, while in hard-seeded species very few control seeds imbibed over several weeks. In 10 species over 50% of the HW-treated seeds imbibed within 30 h, but mostly the percentage of imbibed seeds gradually increased over several weeks. Some seeds in a replicate would imbibe early, while others would remain unimbibed for many days or weeks then, remarkably, become fully imbibed in less than 24 h. While HW treatment broke PY almost instantaneously, it appeared that in many Acacia species some other part of the testa slowed water from reaching the embryo. This process of having staggered imbibition may be a way of ensuring not all seeds in a population germinate after small rain events. Thus it appears the lens acts as a ‘fire gauge’ while some other part of the seed coat acts as a ‘rain gauge’.

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Section: Imbibition -Hw-treated Seedsmentioning

confidence: 99%

Markedly different patterns of imbibition in seeds of 48 Acacia species

2019

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“…Indeed, apart from his own publications (Pedley 1987a(Pedley -d, 1988) there appear to be few others that have adopted the name Racosperma. The only papers known to us are Khasa (1993), Khasa & Bousquet (1994) and (1995), Khasa et al (1994aKhasa et al ( ), (1994bKhasa et al ( ), (1995a and (1995b), Quoirin et al (1997), Carvalho et al (1999) and Takemori et al (2000). These are outweighed, many times over (far too many to list here), by papers adopting the name Acacia, including many in which the Racosperma combinations are cited in synonymy.…”

Section: Reaction To Pedley's Division Of Acaciamentioning

confidence: 97%

A New Species ofSenegalia(Fabaceae, Mimosoideae) from Central America and Colombia

Seigler

Ebinger

2014

Novon: A Journal for Botanical Nomenclature

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“…Surface-scarified and surface-sterilized seeds were germinated in the dark at 28 °C for 48 h in Petri dishes containing soft agar (1%). The duration of seed scarification in concentrated sulfuric acid (H 2 SO 4 ) and rinsing with tap water was 10 and 15 min, respectively (Khasa, 1993).…”

Section: Seedling Preparationmentioning

confidence: 99%

Senegalia senegal (L.) Britton Response to Microbial and Manure Amendments for the Rehabilitation of Waste Rock Dumps in the Essakane Gold Mining Site, Burkina Faso

Yonli

Sene

Sanon

et al. 2022

Front. Environ. Sci.

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Senegalia senegal (L.) Britton (Fabaceae) is a widespread, multipurpose tree capable of colonizing disturbed Sub-Saharan mining sites given its adaptations to arid lands. The purpose of this study was to determine the potential of the association of microbial and/or manure amendments with S. senegal seedlings for the effective rehabilitation of the environment post mining. A multi-year factorial experiment involving this species was conducted in a nursery and on waste rock dumps (Essakane gold mine, NE Burkina Faso). Inoculation with arbuscular mycorrhizal (AM) fungi (native isolate Rhizophagus aggregatus DAOM2277128; commercial isolate Rhizophagus irregularis DAOM197198) and Mesorhizobium plurifarium strain ORS3588 was conducted on S. senegal seedlings. These were planted in black polythene bags filled with three substrate types: 100% sandy soil (substrate A); 75% sandy soil, 25% manure (substrate B); and 50% sandy soil, 50% manure (substrate C). Seedlings were then out-planted on waste rock to determine whether microbial inoculation improves their growth and survival rates. Under nursery conditions, manure-enriched substrates harboured less nodulation and AM colonization, but substantially increased plant height, and dry mass compared to un-amended substrate. Inoculation on manure-enrich substrates did not consistently increase root AM colonization and plant growth parameters among treatments. Plants that were inoculated with R. aggregatus alone or with R. irregularis or Mesorhizobium plurifarium ORS3588 showed the greatest increase in growth variables. On un-amended substrates, inoculation with R. aggregatus in combination with M. plurifarium or R. irregularis significantly enhanced root colonization rates, without altering plant growth parameters. Yet, inoculation with R. irregularis or M. plurifarium alone did not elicit increases in these parameters, although nodulation was greatly improved by the latter treatment. In field conditions, plant growth and survival were reduced under high rate manure amendments, likely due to less AM colonization and root nodulation that was observed for these treatments in nursery before out-planting. Strongly colonized plants on the un-amended substrate and moderately amended substrate showed greater survival after out-planting. Our results support the general conclusion that microbial inoculation and manure-enriched substrates are a viable option for mining site rehabilitation using S. senegal. They also suggest that manure amendments in forest nurseries should be cautiously applied given that high rates may impede establishment of plant symbioses, thereby affecting their performance on waste rock dumps following out-planting.

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Acid scarification and hot water soaking of Racosperma auriculiforme seeds

Cited by 9 publications

References 1 publication

Markedly different patterns of imbibition in seeds of 48 Acacia species

Markedly different patterns of imbibition in seeds of 48 Acacia species

A New Species ofSenegalia(Fabaceae, Mimosoideae) from Central America and Colombia

Senegalia senegal (L.) Britton Response to Microbial and Manure Amendments for the Rehabilitation of Waste Rock Dumps in the Essakane Gold Mining Site, Burkina Faso

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