Abstract
The lack of protocols for breaking seed dormancy, inconsistent seed quality, and abiotic stress factors such as drought impede large-scale restoration efforts of pollinator-friendly native plant species. This research explores the germination response, dormancy-breaking techniques, and water stress tolerance in selected pollinator-friendly plant species with characteristics facilitating mechanized rehabilitation protocols and biodiversity enhancement. Forty-two commercial seed lots representing seven plant families with 28 species were evaluated under two alternating temperature regimes (15/25 °C and 20/30 °C) with and without gibberellic acid (GA3) priming treatments. Six of the twenty-eight species were selected based on pollinator requirements for the monarch butterfly (Danaus plexippus L.) and further examined by priming seeds for 24 h in solutions containing GA3, kinetin (KIN), and hydrogen peroxide (H2O2), or their combinations, to evaluate their dormancy-breaking responses. The effect of water stress on seed germination was assessed in controlled chambers at soil water potentials of −1.08, −0.75, −0.13, and 0 MPa. Initial seed quality of the 42 seed lots revealed that only 62% had greater than 50% germination, while of the same 42 lots, 98% had greater than 50% viability based on the commercial seed label. The difference was largely attributed to seed dormancy. In laboratory studies of the 42 seed lots, GA3 significantly enhanced germination percentage, and reduced T50 (time to 50% germination) across most seed lots. Overall, germination was higher and faster at 20/30 °C than 15/25 °C. Priming the six selected species with 1.0 mM GA3 in 0.3% H2O2 consistently improved germination compared to the non-primed control after 14 days. Asclepias species (A. incarnata, A. syriaca, and A. tuberosa) exhibited consistently high germination across a broad moisture range of −0.75 to 0 MPa. In contrast, Echinacea purpurea required high moisture levels (−0.13 to 0 MPa) for optimal germination. Monarda fistulosa and Rudbeckia hirta showed their best performance under moderate moisture conditions (−0.13 MPa). Collectively, the use of GA3 priming to break physiological seed dormancy offers a promising approach to enhance germination and improving the establishment potential of native pollinator species in restoration programs.
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Claims 12
Claim · model-written summary
Only 62% of seed lots had greater than 50% germination.
Verbatim
e0“only 62% had greater than 50% germination”
t0“Pollinator-Friendly Plant Species”
Claim · model-written summary
Of the same lots, 98% had greater than 50% labeled viability.
Verbatim
e0“98% had greater than 50% viability based on the commercial seed label”
t0“Pollinator-Friendly Plant Species”
Claim · model-written summary
GA3 significantly increased germination percentage across most seed lots.
- Taxon
- plant speciest0
- Treatment
- GA3e0
- Outcome
- germination percentagee0
- Direction
- enhancede0
- Qualifier
- across most seed lotse0
Not reportedComparator
Verbatim
e0“GA3 significantly enhanced germination percentage, and reduced T50 (time to 50% germination) across most seed lots”
t0“Pollinator-Friendly Plant Species”
Claim · model-written summary
GA3 reduced time to 50% germination across most seed lots.
- Taxon
- plant speciest0
- Treatment
- GA3e0
- Outcome
- T50 (time to 50% germination)e0
- Direction
- reducede0
- Qualifier
- across most seed lotse0
Not reportedComparator
Verbatim
e0“GA3 significantly enhanced germination percentage, and reduced T50 (time to 50% germination) across most seed lots”
t0“Pollinator-Friendly Plant Species”
Claim · model-written summary
Germination was higher at 20/30 °C than 15/25 °C.
Verbatim
e0“germination was higher and faster at 20/30 °C than 15/25 °C”
t0“Pollinator-Friendly Plant Species”
Claim · model-written summary
Germination was faster at 20/30 °C than 15/25 °C.
Verbatim
e0“germination was higher and faster at 20/30 °C than 15/25 °C”
t0“Pollinator-Friendly Plant Species”
Claim · model-written summary
Priming with GA3 and H2O2 improved germination of six species relative to non-primed controls after 14 days.
Verbatim
e0“Priming the six selected species with 1.0 mM GA3 in 0.3% H2O2 consistently improved germination compared to the non-primed control after 14 days”
t0“Pollinator-Friendly Plant Species”
Claim · model-written summary
Asclepias species germinated well across −0.75 to 0 MPa.
AsclepiasOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Asclepias species (A. incarnata, A. syriaca, and A. tuberosa) exhibited consistently high germination across a broad moisture range of −0.75 to 0 MPa”
Claim · model-written summary
Echinacea purpurea needed −0.13 to 0 MPa for optimal germination.
- Taxon
- Echinacea purpurea
.jpg?width=60)
Echinacea purpureae0 - Outcome
- germinatione0
- Qualifier
- −0.13 to 0 MPae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Echinacea purpurea required high moisture levels (−0.13 to 0 MPa) for optimal germination”
Claim · model-written summary
Monarda fistulosa germinated best at −0.13 MPa.
- Taxon
- Monarda fistulosa
Monarda fistulosae0 - Outcome
- best performancee0
- Qualifier
- −0.13 MPae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Monarda fistulosa and Rudbeckia hirta showed their best performance under moderate moisture conditions (−0.13 MPa)”
Claim · model-written summary
Rudbeckia hirta germinated best at −0.13 MPa.
- Taxon
- Rudbeckia hirta
Rudbeckia hirtae0 - Outcome
- best performancee0
- Qualifier
- −0.13 MPae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Monarda fistulosa and Rudbeckia hirta showed their best performance under moderate moisture conditions (−0.13 MPa)”
Claim · model-written summary
The authors recommend GA3 priming for dormancy breaking in restoration programs.
Verbatim
e0“the use of GA3 priming to break physiological seed dormancy offers a promising approach to enhance germination and improving the establishment potential of native pollinator species in restoration programs”