Overcoming limitations to propagation from seed of 40 Australian species important for restoration

Ruiz-Talonia, Lorena; Whalley, R. D. B.; Gross, C. L.; Carr, David E.; Reid, Nicholas

doi:10.1007/s11056-022-09953-7

Cited by 3 publications

(3 citation statements)

References 56 publications

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“…Leaching significantly improved the GRI of both species (Figure 5). The positive effects of leaching in this study are consistent with previous observations made for L. longifolia [14] and L. sonderi. Plummer et al [2] suggested that water-soluble germination inhibitors located in the pericarp and embryo could inhibit germination in L. sonderi; germination inhibition was successfully overcome by removing the pericarp or by leaching seeds for 24 h in running tap water.…”

Section: Seed Germination Ecology and Enhancementsupporting

confidence: 93%

“…Even though the embryos were small, microscopic evaluation showed that embryos in this current study were fully differentiated and seemed to be fully developed, consisting of a well-defined primary axis and cotyledon. In contrast, Ruiz-Talonia et al [14] identified MPD in L. longifolia due to the presence of an underdeveloped embryo. In their study, a combination of leaching and warm stratification was needed to overcome dormancy and improve germination.…”

Section: Seed Morpho-anatomymentioning

confidence: 86%

“…[7], which could be associated with an overcoming of PD. Moreover, leaching of inhibitors from L. longifolia seeds with five cycles of soaking and rinsing combined with warm stratification significantly improved its germination [14]. Similarly, leaching seeds with running tap water or pericarp removal could overcome dormancy in L. sonderi and could achieve germination of ca.…”

Section: Seed Lotsmentioning

confidence: 97%

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Seed Morpho-Anatomy and Germination Enhancement of the Australian Native Species Lomandra longifolia Labill. and L. hystrix (R.Br.) L.R. Fraser & Vickery

Beveridge

Williams

Cave

et al. 2023

Applied Biosciences

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Lomandra species are an important understory component of many Australian native ecosystems, contributing to the floristic richness and stabilizing soils. However, a limited understanding of their germination biology currently hinders their efficient use in seed-based restoration and ornamental plant production. The present study investigated Lomandra longifolia and L. hystrix diaspore morpho-anatomy and evaluated different mechanical and/or chemical treatments (nicking, leaching, smoke water and gibberellic acid [GA3]) and under light or dark conditions to enhance germination. Embryos of both species were small and linear with a low embryo to seed ratio (<0.45). Germination rates of both species were significantly hastened by leaching seeds in running water for 36 h as compared to a non-leached seed. The results suggest that pre-treating both Lomandra species by leaching could maximize the effectiveness of seed used by resulting in faster, more uniform and, therefore, reliable germination of these species. Finally, seeds of L. longifolia had low final germination (<40%), with a high presence of viable but dormant seeds. The ecological cues that promote germination in nature for both species should be further examined.

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Section: Seed Germination Ecology and Enhancementsupporting

confidence: 93%

Section: Seed Morpho-anatomymentioning

confidence: 86%

Section: Seed Lotsmentioning

confidence: 97%

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Seed Morpho-Anatomy and Germination Enhancement of the Australian Native Species Lomandra longifolia Labill. and L. hystrix (R.Br.) L.R. Fraser & Vickery

Beveridge

Williams

Cave

et al. 2023

Applied Biosciences

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The need for mechanistic explanations in (seed) ecology

Pausas,

Lamont,

Keeley

et al. 2024

New Phytologist

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Seed dormancy, germination requirements, and implications of herbicides for Penstemon albidus and P. nitidus

Cooper,

Bolwerk,

Leffler

et al. 2024

Restoration Ecology

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Seed‐based restoration is dependent on seed germination, and poor germination can cause restoration failure. Many restoration failures can be attributed to a lack of knowledge of germination characteristics, species‐specific seed dormancy, or the effects of widely used herbicides on germination. White penstemon (Penstemon albidus) and Waxleaf penstemon (P. nitidus) are native to the Northern Great Plains region of North America, and increased germination of these species would contribute to improved restoration in the region. We performed two concurrent experiments to determine: (1) the germination requirements and dormancy class of these species; and (2) the effects of herbicides on germination. To determine germination requirements, we applied pretreatments (scarification, smoke, and KNO3) and three durations (2, 4, and 8 weeks) of cold and warm stratification. To test the effects of herbicides on germination, three commonly used herbicides (atrazine, trifluralin, and 2,4‐D) were applied at six concentrations (100, 50, 10, 1, 0.1, and 0% of the recommended field application rate). Germination characteristics indicate both species express physiological dormancy. Physiological dormancy denotes an embryo with low growth potential that is unable to overcome mechanical constraints but can be alleviated with proper temperature cues. Both species required cold stratification, with P. nitidus needing a longer period (8 weeks) than P. albidus (4 weeks). Final germination percentage of P. albidus decreased with higher doses of 2,4‐D but was not affected by atrazine or trifluralin. These experiments help to create protocol for the use of our study species, as well as other species, in restoration plantings.

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Overcoming limitations to propagation from seed of 40 Australian species important for restoration

Cited by 3 publications

References 56 publications

Seed Morpho-Anatomy and Germination Enhancement of the Australian Native Species Lomandra longifolia Labill. and L. hystrix (R.Br.) L.R. Fraser & Vickery

Seed Morpho-Anatomy and Germination Enhancement of the Australian Native Species Lomandra longifolia Labill. and L. hystrix (R.Br.) L.R. Fraser & Vickery

The need for mechanistic explanations in (seed) ecology

Seed dormancy, germination requirements, and implications of herbicides for Penstemon albidus and P. nitidus

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