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Markedly different patterns of imbibition in seeds of 48 Acacia species

  • Geoffrey E. Burrows (a1), Rowan Alden (a1) and Wayne A. Robinson (a2)

Abstract

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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Copyright

This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.

Corresponding author

Author for correspondence: Geoffrey E. Burrows. E-mail: gburrows@csu.edu.au

References

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Auld, TD (1986) Dormancy and viability in Acacia suaveolens (Sm.) Willd. Australian Journal of Botany 34, 463472.
Auld, TD (1990) Regeneration in populations of the arid zone plants Acacia carnei and A. oswaldii. Proceedings of the Ecological Society of Australia 16, 267272.
Auld, TD (1993) The impact of grazing on regeneration of the shrub Acacia carnei in arid Australia. Biological Conservation 65, 165176.
Baskin, CC and Baskin, JM (2014) Seeds. Ecology, Biogeography, and Evolution of Dormancy and Germination (2nd edn). San Diego, CA, USA: Academic Press.
Baskin, JM, Baskin, CC and Li, X (2000) Taxonomy, anatomy and evolution of physical dormancy in seeds. Plant Species Biology 15, 139152.
Baskin, JM, Davis, BH, Baskin, CC, Gleason, SM and Cordell, S (2004) Physical dormancy in seeds of Dodonaea viscosa (Sapindales, Sapindaceae) from Hawaii. Seed Science Research 14, 8190.
Bell, DT, Plummer, JA and Taylor, SK (1993) Seed germination ecology in southwestern Western Australia. Botanical Review 59, 2473.
Bewley, JD and Black, M (1994) Seeds: Physiology of Development and Germination (2nd edn). New York, USA: Plenum Press.
Booth, DT and Bai, Y (1999) Imbibition temperature effects on seedling vigor: in crops and shrubs. Journal of Range Management 52, 534538.
Burrows, GE (1991) Pre-treatment ensures rapid germination. Australian Horticulture 89, 4447.
Burrows, GE, Alden, R and Robinson, WA (2018) The lens in focus – lens structure in seeds of 51 Australian Acacia species and its implications for imbibition and germination. Australian Journal of Botany 66, 398413.
Burrows, GE, Virgona, JM and Heady, RD (2009) Effect of boiling water, seed coat structure and provenance on the germination of Acacia melanoxylon seeds. Australian Journal of Botany 57, 139147.
Cavanagh, AK (1980) A review of some aspects of the germination of acacias. Proceedings of the Royal Society of Victoria 91, 161180.
Cavanagh, T (1987) Germination of hard-seeded species: mimosoid seeds (Appendix 4B), pp. 202206 in Langkamp, P (ed), Germination of Australian Native Plant Seed. Melbourne, Australia: Inkata Press.
Clemens, J, Jones, PG and Gilbert, NH (1977) Effect of seed treatments on germination in Acacia. Australian Journal of Botany 25, 269276.
Coaldrake, JE (1971) Variation in some floral, seed, and growth characteristics of Acacia harpophylla (brigalow). Australian Journal of Botany 19, 335352.
Commander, LE, Merritt, DJ, Rokich, DP and Dixon, KW (2009) Seed biology of Australian arid zone species: germination of 18 species used for rehabilitation. Journal of Arid Environments 73, 617625.
Cromer, EL (2007) Seed germination and research records from Alcoa's Marrinup nursery. Alcoa World Alumina Australia.
Danthu, P, Roussel, J, Dia, M and Sarr, A (1992) Effect of different pretreatments on the germination of Acacia senegal seeds. Seed Science and Technology 20, 111117.
Dell, B (1980) Structure and function of the strophiolar plug in seeds of Albizia lophantha. American Journal of Botany 67, 556563.
Doran, JC and Gunn, BV (1987) Treatments to promote seed germination in Australian acacias, pp. 5763 in Turnbull, JW (ed), Australian Acacias in Developing Countries. Canberra, Australia: Australian Centre for International Agricultural Research.
Erickson, TE (2015) Seed dormancy and germination traits of 89 arid zone species targeted for mine-site restoration in the Pilbara region of Western Australia. PhD thesis, University of Western Australia.
Erickson, TE, Merritt, DJ and Turner, SR (2016) Overcoming physical seed dormancy in priority native species for use in arid-zone restoration programs. Australian Journal of Botany 64, 401416.
Ferreras, AE, Zeballos, SR and Funes, G (2017) Inter- and intra-population variability in physical dormancy along a precipitation gradient. Acta Botanica Brasilica 31, 141146.
Funes, G and Venier, P (2006) Dormancy and germination in three Acacia (Fabaceae) species from central Argentina. Seed Science Research 16, 7782.
Hanna, PJ (1984) Anatomical features of the seed coat of Acacia kempeana (Mueller) which relate to increased germination rate induced by heat treatment. New Phytologist 96, 2329.
Hellum, AK (1990) Seed ecology in a population of Acacia holosericea. Canadian Journal of Forest Research 20, 927933.
Herranz, JM, Ferrandis, P and Martínez-Sánchez, JJ (1998) Influence of heat on seed germination of seven Mediterranean Leguminosae species. Plant Ecology 136, 95103.
Hudson, AR, Ayre, DJ and Ooi, MKJ (2015) Physical dormancy in a changing climate. Seed Science Research 25, 6681.
Jaganathan, GK, Wu, G-R, Han, Y-Y and Liu, BL (2017) Role of the lens in controlling physical dormancy break and germination of Delonix regia (Fabaceae: Caesalpinioideae). Plant Biology 19, 5360.
Jaganathan, GK, Yule, KJ and Biddick, M (2018) Determination of the water gap and the germination ecology of Adenanthera pavonina (Fabaceae, Mimosoideae); the adaptive role of physical dormancy in mimetic seeds. AoB Plants 10, ply048.
Johnson, RW (1964) Ecology and Control of Brigalow in Queensland. Brisbane, Australia: Government Printer.
Khasa, PD (1993) Acid scarification and hot water soaking of Racosperma auriculiforme seeds. The Forestry Chronicle 69, 331334.
Liyanage, GS and Ooi, MKJ (2015) Intra-population level variation in thresholds for physical dormancy-breaking temperature. Annals of Botany 116, 123131.
Manning, JC and Van Staden, J (1987) The role of the lens in seed imbibition and seedling vigour of Sesbania punicea (Cav.) Benth. (Leguminosae: Papilionoideae). Annals of Botany 59, 705713.
Matos, ACB, Ataíde, GM and Borges, EEL (2015) Physiological, physical, and morpho-anatomical changes in Libidibia ferra ((Mart. ex Tul.) L.P. Queiroz) seeds after overcoming dormancy. Journal of Seed Science 37, 2632.
Morrison, DA, Auld, TD, Rish, S, Porter, C and McClay, K (1992) Patterns of testa-imposed seed dormancy in native Australian legumes. Annals of Botany 70, 157163.
Nano, CEM, Bowland, AE and Pavey, CR (2013) Factors controlling regeneration in a rare desert tree Acacia peuce: limits to soil seed bank accumulation in time and space. Journal of Arid Environments 90, 114122.
Obroucheva, NV (1999) Seed Germination: A Guide to the Early Stages. Leiden, The Netherlands: Backhuys Publishers.
Odoemena, CS (1988) Breaking of seed coat dormancy in a medicinal plant Tetrapleura tetraptera (Schum & Thonn). Journal of Agricultural Science 111, 393394.
Owens, MK, Wallace, RB and Archer, S (1995) Seed dormancy and persistence of Acacia berlandieri and Leucaena pulverulenta in a semi-arid environment. Journal of Arid Environments 29, 1523.
Pound, LM, Ainsley, PJ and Facelli, JM (2014) Dormancy-breaking and germination requirements for seeds of Acacia papyrocarpa, Acacia oswaldii and Senna artemisioides ssp. × coriacea, three Australian arid-zone Fabaceae species. Australian Journal of Botany 62, 546557.
Reichman, SM, Bellairs, SM and Mulligan, DR (2006) The effects of temperature and salinity on Acacia harpophylla (brigalow) (Mimosaceae) germination. The Rangeland Journal 28, 175178.
Rodrigues-Junior, AG, Baskin, CC, Baskin, JM and Garcia, QS (2018a) Sensitivity cycling in physically dormant seeds of the Neotropical tree Senna multijuga (Fabaceae). Plant Biology 20, 698706.
Rodrigues-Junior, AG, Faria, JMR, Vaz, TAA, Nakamura, AT and José, AC (2014) Physical dormancy in Senna multijuga (Fabaceae: Caesalpinioideae) seeds: the role of seed structures in water uptake. Seed Science Research 24, 147157.
Rodrigues-Junior, AG, Mello, ACMP, Baskin, CC, Baskin, JM, Oliveira, DMT and Garcia, QS (2018b) Why large seeds with physical dormancy become nondormant earlier than small ones. PLOS One 13, e0202038.
Ruprecht, E, Fenesi, A, Fodor, EI, Kuhn, T and Tökölyi, J (2015) Shape determines fire tolerance of seeds in temperate grasslands that are not prone to fire. Perspectives in Plant Ecology, Evolution and Systematics 17, 397404.
Russi, L, Cocks, PS and Roberts, EH (1992) Coat thickness and hard-seededness in some Medicago and Trifolium species. Seed Science Research 2, 243249.
Southgate, BJ (1983) Handbook on Seed Insects of Acacia Species. Rome, Italy: Food and Agriculture Organization.
Suleiman, MK, Dixon, K, Commander, L, Nevill, P, Bhat, NR, Islam, MA, Jacob, S and Thomas, R (2018) Seed germinability and longevity influences regeneration of Acacia gerrardii. Plant Ecology 219, 591609.
Taylor, GB (1996) Effect of the environment in which seeds are grown and softened on the incidence of autumn seed softening in two species of annual medics. Australian Journal of Agricultural Research 47, 141159.
Taylor, GB (2004) Effect of temperature and state of hydration on rate of imbibition in soft seeds of yellow serradella. Australian Journal of Agricultural Research 55, 3945.
Taylor, GB (2005) Hardseededness in Mediterranean annual pasture legumes in Australia: a review. Australian Journal of Agricultural Research 56, 645661.
Tran, VN (1979) Effects of microwave energy on the strophiole, seed coat and germination of Acacia seeds. Australian Journal of Plant Physiology 6, 277287.
Tran, VN and Cavanagh, AK (1984) Structural aspects of dormancy, pp. 144 in Murray, DR (ed), Seed Physiology. Vol. 2. Germination and Reserve Mobilization. Sydney, Australia: Academic Press.
van Staden, J, Manning, JC and Kelly, KM (1989) Legume seeds – the structure:function equation, pp. 417450 in Stirton, CH and Zarucchi, JL (eds), Advances in Legume Biology. St Louis, USA: Missouri Botanic Garden Press.
Venier, P, Funes, G and García, CC (2012) Physical dormancy and histological features of seeds of five Acacia species (Fabaceae) from xerophytic forests in central Argentina. Flora 207, 3946.
Wilson, TB and Witkowski, ETF (1998) Water requirements for germination and early seedling establishment in four African savanna woody plant species. Journal of Arid Environments 38, 541550.
Zar, JH (2010) Biostatistical Analysis (5th edn). Indianapolis, USA: Prentice Hall.
Zeng, LW, Cocks, PS, Kailis, SG and Kuo, J (2005) Structure of the seed coat and its relationship to seed softening in Mediterranean annual legumes. Seed Science & Technology 33, 351362.

Keywords

Markedly different patterns of imbibition in seeds of 48 Acacia species

  • Geoffrey E. Burrows (a1), Rowan Alden (a1) and Wayne A. Robinson (a2)

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