Presowing seed treatment methods to overcome dormancy in seeds of Vachellia rehmanniana Schinz

Mojeremane, Witness; Mathowa, Thembinkosi; Teketay, Demel; Stimela, Tebogo; Kopong, Ishmael; Rampart, Melusi

doi:10.17707/agricultforest.63.2.15

Cited by 7 publications

(18 citation statements)

References 9 publications

(22 reference statements)

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“…violacea seedstreated in concentrated H2SO4to reach maximum germination. This is in agreement with others who usedH2SO4 treatments to overcome dormancy in seeds of many tree species (Teketay, 1996;Agbogidi et al, 2007;Likoswe et al,2008;Amusa, 2011;Aref et al,2011;Li et al, 2013;Fredrick et al, 2017;Mojeremane et al, 2017Mojeremane et al, , 2018. For example, Amusa (2011) reported that concentrated H2SO4 disrupts and exposes the lumens of the macrosclereids cells by disrupting the hard seed coat, thereby, allowing uptake of water to induce the germination process.…”

Section: Discussionsupporting

confidence: 91%

“…Maximum germination recorded in these treatments could probably be attributed to the uptake of water and gaseous exchangedue to softening or cracking of the seed coat (Teketay, 2005;Azad et al, 2011) which triggered the germination process (Teketay, 2005;Rasebeka et al, 2014). Mechanical scarification has been reported to break physical dormancy rendered by hard seed coats by enhancing gases and water uptake especially in leguminous species (Missanjo et al, 2014;Mojeremane et al, 2017Mojeremane et al, , 2018.Earlier germination in nicked P. violacea seeds in the present study could be due to cracks made on the seed creating entry of water and exchange of gases, resulting in enzymatic hydrolysis and, thus, transforming the embryo into a seedling. This is in agreement with others who demonstrated that nicking part of the hard seed coat, which prevents imbibition and gaseous exchange (Teketay, 2005;Azad et al,2011) triggered the germination process (Teketay, 2005;Olatunji et al, 2013).…”

Section: Discussionmentioning

confidence: 57%

“…8, No. 1, June 2019 Numerous studies have demonstrated that pre-treating seeds to break the hard seed coat significantly enhances germination in various tree species (Teketay, 1996(Teketay, , 1998Hossain et al, 2005;Chaodumrikul et al, 2016;Mojeremane et al, 2017Mojeremane et al, , 2018.…”

Section: Discussionmentioning

confidence: 99%

“…For germination to take place, the seed coat should rupture to allow absorption of water and air by the seed (Mojeremane et al, 2017). Hard-coated seeds require some form of pre-treatment before sowing to break dormancy in order to obtain rapid and synchronous germination (Mojeremane et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Hard-coated seeds require some form of pre-treatment before sowing to break dormancy in order to obtain rapid and synchronous germination (Mojeremane et al, 2017). Seeds that have not been given pretreatment to break dormancy may completely fail to germinate, germination may be slow or germination of individual seeds in a seed lot may take place over a long period (Schmidt, 2000).Several methods that includecold, hot and boiling water, concentrated sulphuric acid, stratification, mechanical scarification, dry heat and fire have been used successfully to break dormancy in many species with hard-coated seeds (Teketay, 1996(Teketay, , 1998Uniyal et al, 2000;Aref et al, 2011;Botsheleng et al, 2014;Fredrick et al, 2017;Mojeremane et al, 2017Mojeremane et al, , 2018. The methods are species specific and no single treatment has been reported to be effective across plant species (Uniyal et al, 2000;Amusa, 2011).Information on suitable methods for breaking dormancy in P. violaceaseeds is lacking.…”

Section: Introductionmentioning

confidence: 99%

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Breaking seed dormancy in Philenoptera violacea (Klotzsch) Schrire using different pre-sowing treatment methods

Setlhabetsi¹,

Mojeremane²

2019

JAES

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Seeds of many woody plant species cannot germinate even if they are sown under optimal moisture, oxygen and soil conditions because of hard seed coat dormancy. A seed germination experiment to evaluate the suitability of various dormancy breaking methods in Philenoptera violacea seeds was conducted in the laboratory of the Department of Crop Science and Production, Botswana University of Agriculture and Natural Resources (BUAN) between November and December 2017. A completely randomized design (CRD) with 10 treatments, involving; control (untreated seeds), mechanical scarification, hot water (24 hours), boiling water (1, 3 and 5 minutes) and concentrated sulphuric acid (15, 30, 45 and 60 minutes) was used. Germination percentage, germination mean time (GMT) and germination index (GI) were significantly (P <0.01) affected by seed dormancy breaking methods. The highest germination percentages were recorded in seeds immersed in concentrated sulphuric acid for 15 and 30 minutes (100%), followed by concentrated sulphuric acid 45 minutes and hot water for 24 hours (99%), mechanical scarification (98%) and concentrated sulphuric acid for 60 minutes (97%), which were significantly higher than the rest, boiling water being the least. Untreated seeds took the longest time (20.50 days) for 86% of the seeds to germinate whereas the shortest significant GMT (2.23-2.66 days) was recorded for maximum germinations (100%). Boiling water (1, 3 and 5 minutes) revealed significantly lower GI (0.00-0.02). Although, 86% of untreated seeds germinated, the present findings emphasize the importance of treating P. violacea seeds before sowing to promote quick and uniform germination.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 57%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Breaking seed dormancy in Philenoptera violacea (Klotzsch) Schrire using different pre-sowing treatment methods

Setlhabetsi¹,

Mojeremane²

2019

JAES

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Enhancing Germination of Seeds of Cassia abbreviata and Senegalia nigrescens Using Pre-Sowing Seed Treatments in Botswana

et al. 2021

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Cassia abbreviata and Senegalia nigrescens are indigenous trees found in North and Central regions of Botswana. However, inadequate knowledge of their silviculture and decline in population due to deforestation, expanding settlements, infrastructure and agriculture are major threats to most indigenous tree species in Botswana. Like many indigenous tree species, Cassia abbreviata and Senegalia nigrescens are slow-growing and are threatened by overexploitation for numerous uses. Because of the increased demand for medicinal uses, medicinal species such Cassia abbreviata are rapidly disappearing in many habitats and threatened to extinction. This study assessed the response of pre-sowing treatment methods on quiescency and germination of seeds of Cassia abbreviata and Senegalia nigrescens tree species found in semiarid Savanna Ecozone of Botswana. Pre-sowing treatment included immersion in 98% undiluted sulfuric acid (H2SO4) for 15, 30, 45 and 60 minutes, submergence in boiling water for one, two, three minutes and submerged in warm water for 24 hours, mechanical scarification of the seed coat and control. ANOVA showed that there is a highly significant difference (P < 0.0001) among the treatments of C. abbreviata in seed germination and no significant difference among the treatments of S. nigrescens. The highest germination percentage of C. abbreviata seeds was 81%, which was found from seeds immersed in H2SO4 for 30 minutes, while for S. nigrescens seeds, the highest germination percentage was 99%, which was found from seeds treated with mechanical scarification and those immersed in H2SO4 for 15 and 45 minutes. The objective of this study is to determine the effect of pretreatment methods on germination of C. abbreviata and S. nigrescens seeds. Based on these results, we recommend sulphuric acid and mechanical scarification as suitable seed pre-sowing treatments for enhancing the germination of C. abbreviata and S. nigrescens, respectively.

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Overcoming Seed Dormancy of Senegalia Galpinii and Vachellia Robusta Through Scarification Pre-Sowing Treatments

Botumile¹,

Teketay²,

Mojeremane³

et al. 2020

AgricultForest

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The seeds of Senegalia galpinii (Burtt Davy) Seigler and Ebinger and Vachellia robusta (Burch.) Kyalangalilwa and Boatwright have hard coatimposed dormancy that prevents water and air from entering the seeds, which is essential for the germination process. The specific objectives of this study were to determine the number of seeds per pod for the study species; determine the size and weight of seeds; and test the effects of scarification pre-sowing treatments on the speed, uniformity and total percent germination of seeds. Seeds of both species were subjected to 10 different pre-sowing seed treatments: the control, mechanical scarification, soaking in concentrated sulphuric acid (for 15, 30, 45 and 60 minutes), immersion in boiling water (for 1, 3 and 5 minutes), and soaking in boiling water (and cooling down for 24 hours). The germination data were examined using an analysis of variance and Tukey's honestly significant difference test to separate significantly different treatment means. The results showed that the mean number of seeds per pod was 7 ± 0.2 and 10 ± 0.03 for S. galpinii and V. robusta, respectively. For S. galpinii, the mean length, width and breadth of seeds were 12 ± 0.2, 10.4 ± 0.1 and 2.7 ± 0.03 mm, respectively. For V. robusta, the mean length, width and breadth of the seeds were 10 ± 0.1, 6.1 ± 0.1 and 4.2 ± 0.1, respectively. The mean thousand-seed weights were 275 ± 3 and 183.6 ± 6 g for S. galpinii and V. robusta, respectively. The results indicated that seeds treated with mechanical, sulphuric acid and boiling water scarification had significantly higher mean germination percentages than the controls for S. galpinii, whereas for V. robusta, mechanical scarification, exposure to sulphuric acid and immersion in boiling water and then cooling down for 24 hours yielded a better total percent germination than the controls. The highest mean germination percentages for S. galpinii (92-100%) were observed for seeds

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Presowing seed treatment methods to overcome dormancy in seeds of Vachellia rehmanniana Schinz

Cited by 7 publications

References 9 publications

Breaking seed dormancy in Philenoptera violacea (Klotzsch) Schrire using different pre-sowing treatment methods

Breaking seed dormancy in Philenoptera violacea (Klotzsch) Schrire using different pre-sowing treatment methods

Enhancing Germination of Seeds of Cassia abbreviata and Senegalia nigrescens Using Pre-Sowing Seed Treatments in Botswana

Overcoming Seed Dormancy of Senegalia Galpinii and Vachellia Robusta Through Scarification Pre-Sowing Treatments

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