A Geographical Perspective on Germination Ecology

Baskin, Carol C.; Baskin, Jerry M.

doi:10.1016/b978-0-12-416677-6.00010-x

Cited by 3 publications

(2 citation statements)

References 1,227 publications

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“…The heavier seeds produced by the Y 4 plants also showed less pronounced inhibition of germination in the presence of 25 mM Na 2 CO 3 , suggesting that prolonging the duration of pot cultivation had a mitigating effect on alkaline stress in the resulting seeds. These findings align with previous research in which heavier seeds tended to exhibit higher germination percentages than lighter seeds [45]. Our results provide further evidence in support of this notion, as the lighter Y 2 and Y 3 seeds tended to have lower germination and reduced shoot and root lengths.…”

Section: Discussionsupporting

confidence: 93%

Seed germination demonstrates inter-annual variations in alkaline tolerance: a case study in perennial Leymus chinensis

Zhao,

Ma,

et al. 2024

BMC Plant Biol

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Background and aims The escalating issue of soil saline-alkalization poses a growing global challenge. Leymus chinensis is a perennial grass species commonly used in the establishment and renewal of artificial grasslands that is relatively tolerant of saline, alkaline, and drought conditions. Nonetheless, reduced seed setting rates limit its propagation, especially on alkali-degraded grassland. Inter-annual variations have an important effect on seed yield and germination under abiotic stress, and we therefore examined the effect of planting year on seed yield components of L. chinensis. Methods We grew transplanted L. chinensis seedlings in pots for two (Y2), three (Y3), or four (Y4) years and collected spikes for measurement of seed yield components, including spike length, seed setting rate, grain number per spike, and thousand seed weight. We then collected seeds produced by plants from different planting years and subjected them to alkaline stress (25 mM Na2CO3) for measurement of germination percentage and seedling growth. Results The seed setting rate of L. chinensis decreased with an increasing number of years in pot cultivation, but seed weight increased. Y2 plants had a higher seed setting rate and more grains per spike, whereas Y4 plants had a higher thousand seed weight. The effects of alkaline stress (25 mM Na2CO3) on seed germination were less pronounced for the heavier seeds produced by Y4 plants. Na2CO3 caused a 9.2% reduction in shoot length for seedlings derived from Y4 seeds but a 22.3% increase in shoot length for seedlings derived from Y3 seeds. Conclusions Our findings demonstrate significant differences in seed yield components among three planting years of L. chinensis under pot cultivation in a finite space. Inter-annual variation in seed set may provide advantages to plants. Increased alkalinity tolerance of seed germination was observed for seeds produced in successive planting years.

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Section: Discussionsupporting

confidence: 93%

Seed germination demonstrates inter-annual variations in alkaline tolerance: a case study in perennial Leymus chinensis

Zhao,

Ma,

et al. 2024

BMC Plant Biol

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“…Temperature influences germination rate and seedling establishment, suggesting that warming will affect, in the long term, the composition of the aboveground vegetation and, in turn, the future seed bank of forest communities. Moreover, seedling emergence is usually synchronized with seasonal changes in the environment (Baskin and Baskin, 2014;Fenner and Thompson, 2005;Walck et al, 2011) implying that forecasted changes in ecological cues may preclude, delay, or enhance regeneration from seeds, depending on the species (Walck et al, 2011). In our experiment, the translocation of soil from upland (between 300 and 800 m) to lowland areas (between 0 and 150 m) negatively affected seedling density, in both interior and edge soil.…”

Section: Effects Of Upland To Lowland Translocation Experimentsmentioning

confidence: 67%

Edge effects on the realised soil seed bank along microclimatic gradients in temperate European forests

Gasperini

Carrari

Govaert

et al. 2021

Science of The Total Environment

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Seed bank responses to different microclimates were studied in temperate forests.• Thermophilous forests showed a compositionally different edge vs interior seed bank. • Forest edges shifted the seedling community to a more light-demanding composition.• Soil translocation from up to lowland favoured the emergence of generalist plants.• Forest fragmentation should be prevented to conserve seed banks' forest specialists.

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Type 2 Nondeep Physiological Dormancy in Seeds of Fraxinus chinensis subsp. rhynchophylla (Hance) A.E.Murray

Yang

Baskin

et al. 2022

Forests

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Fraxinus chinensis subsp. rhynchophylla (Oleaceae), hereafter F. rhynchophylla, is an important timber species in northeast China; however, little is known about its seed dormancy and germination, which hinders regeneration of the species from seeds for reforestation and conservation. Our aim was to determine the class of seed dormancy and how to break it. Studies were conducted to determine the permeability of the seed coat to water, changes in embryo development during cold stratification and effects of cold stratification on germination over a range of temperatures. The seeds were water-permeable, and the embryo was fully developed and filled the embryonic cavity. Cold stratification at 5 °C for 8 weeks was effective in breaking dormancy; thus, we conclude that the seeds have nondeep physiological dormancy (PD). As cold stratification time was increased, the ability of seeds to germinate at low temperatures (e.g., 10 °C and 15 °C) increased, indicating the presence of Type 2 nondeep PD, in which the minimum temperature for germination decreases during dormancy-break. Nondormant seeds germinated to high percentages and rates at constant temperatures of 25 °C (germination percentage was 63%) and at alternating temperature regimes of 35 °C/25 °C, 30 °C/15 °C, 25 °C/20 °C and 20 °C/10 °C (germination percentage was 66%, 67%, 65% and 66%, respectively). To produce seedlings, we recommend 8 weeks of cold stratification at 5 °C before sowing the seeds at temperatures ranging from 15 °C to 30 °C.

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A Geographical Perspective on Germination Ecology

Cited by 3 publications

References 1,227 publications

Seed germination demonstrates inter-annual variations in alkaline tolerance: a case study in perennial Leymus chinensis

Seed germination demonstrates inter-annual variations in alkaline tolerance: a case study in perennial Leymus chinensis

Edge effects on the realised soil seed bank along microclimatic gradients in temperate European forests

Type 2 Nondeep Physiological Dormancy in Seeds of Fraxinus chinensis subsp. rhynchophylla (Hance) A.E.Murray

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