Effect of Water Potential and Temperature on the Germination of Four Species of African Savanna Trees

Choinski, John S.; Tuohy, Janet M.

doi:10.1093/oxfordjournals.aob.a088247

Cited by 55 publications

(34 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In contrast to the findings of Choinsky & Tuohy (1991), our results suggest that A. tortilis seeds germinate better at sites with a considerable temperature amplitude. At temperatures above 25…”

Section: Discussioncontrasting

confidence: 99%

Germination strategy of the East African savanna tree Acacia tortilis

et al. 2005

View full text Add to dashboard Cite

Germination of Acacia tortilis seeds strongly depends on micro-site conditions. In Lake Manyara National Park, Tanzania, Acacia tortilis occurs abundantly in recently abandoned arable fields and in elephant-mediated gaps in acacia woodland, but does not regenerate in grass swards or beneath canopies. We examined the germination of Acacia tortilis using field and laboratory experiments. Seeds placed on top of the soil rarely germinated, while seeds covered with elephant dung or buried under the soil surface had a germination success between 23-43%. On bare soil 39% of both the dung-covered and buried seeds germinated, in perennial grass swards 24-43%, and under tree canopies 10-24% respectively. In laboratory experiments, seed water absorption correlated positively with temperature up to 41• C, while subsequent germination was optimal at lower (21-23• C) temperatures. Seeds that had absorbed water lost their viability when kept above 35.5• C. The absence of light did not significantly influence germination success. Acacia tortilis does not actively disperse its seeds, but regeneration outside tree canopies was substantial. The regeneration potential thus strongly depends on the physiognomy of the vegetation.

show abstract

Section: Discussioncontrasting

confidence: 99%

Germination strategy of the East African savanna tree Acacia tortilis

et al. 2005

View full text Add to dashboard Cite

show abstract

“…The published evidence and our observations, however, oppose the germination behaviour of most plants in tropical and temperate habitats, and crops and annual plants in arid environments. For these the optimum water potential for germination coincides with the soil field water capacity and seed hydration, germination rate and germinability all decrease as water potential drops (Williams & Shaykewich, 1971;Mott, 1972;Romo & Haferkamp, 1987;Cluff & Roundy, 1988;Meidan, 1989;Evans & Etherington, 1990;Choinski & Tuohy, 1991;Khatri et al, 1991;Kiemnec & Larson, 1991;Qi & Redmann, 1993;Facelli & Ladd, 1996;Swaegel et al, 1997;Al-Karaki, 1998;Rowse et al, 1999).…”

Section: Discussionmentioning

confidence: 96%

“…Potter et al (1986) found that some populations of the North American shrub, Atriplex canescens had higher germinability at low water potential, than other populations of this species. Also, Choinski & Tuohy (1991) found that the South African shrubs Combretum apiculatum and Colophospermum mopane had high germinability over a wide range of soil water potentials. A similar result was found by IbaH n ez & Passera (1997) for the Spanish shrub Anthyllis cytisoides.…”

Section: Discussionmentioning

confidence: 99%

Plant life-form and germination in a Mexican inter-tropical desert: effects of soil water potential and temperature

Flores

Briones

2001

Journal of Arid Environments

107

View full text Add to dashboard Cite

“…Other species are less tolerant to osmotic effects, such as the African savannah legumes Combretum apiculatum, Colophospermum mopane, Acacia karroo and Acacia tortilis, displaying reduced germination at Ψs < -0.3 MPa (Choinsky and Tuohy 1993). There are even more sensitive species such as Guizotia abyssinica (Lf) Cass.…”

Section: Discussionmentioning

confidence: 99%

Inducing salt tolerance in castor bean through seed priming

Lopes¹,

Prisco²,

Gomes-Filho³

2018

Aust J Crop Sci

View full text Add to dashboard Cite

Castor bean (Ricinus communis L.) cultivation requires production techniques appropriate for its growth conditions. Thus, the characterization of the deleterious effects of salinity on seed germination and on seedling establishment and the evaluation of the use of priming techniques on seeds could reduce replanting costs and improve emergence uniformity, preparing plant responses to salt stress. The goals of this current research were to characterize the deleterious effects of salinity on seed germination and on seedling establishment and to evaluate the use of the seed priming techniques as a tool to minimize these deleterious effect. In this research, castor bean seeds, cv. BRS-Energia was used to characterize effects of salt stress on germination and seedling establishment. Then, some chemicals such as PEG-6000 and H 2 O 2 were evaluated to find the beneficial priming techniques for castor bean seeds against salt stress. Our results indicate that water imbibition by the seed under salinity conditions decelerated the time of exposure to salinity. Salinity also affected the germination of castor bean seeds under an Ψs of -0.4 MPa and seedling growth was already affected under an Ψs of -0.16 MPa. Priming with CaCl 2 , NaNO 2 , NaNO 3 and PEG-6000 showed promising results under an Ψs of 0.0 MPa, but priming with NaNO 3 and PEG-6000 were ones that contributed most to better germination and establishment of seedlings under saline conditions. However, NaNO 3 is the most recommended priming agent for castor bean because accelerated seed germination, reducing the time to emergence and planting risks.

show abstract

Effect of Water Potential and Temperature on the Germination of Four Species of African Savanna Trees

Cited by 55 publications

References 12 publications

Germination strategy of the East African savanna tree Acacia tortilis

Germination strategy of the East African savanna tree Acacia tortilis

Plant life-form and germination in a Mexican inter-tropical desert: effects of soil water potential and temperature

Inducing salt tolerance in castor bean through seed priming

Contact Info

Product

Resources

About