Effects of temperature and water potential on seed germination of 13 Poa L. species in the Qinghai-Tibetan Plateau

Wei, Linna; Zhang, Chunping; Qian, Dong; Yang, Zengzeng; Chu, Hui; Yu, Yang; Yang, Xiaoxia

doi:10.1016/j.gecco.2020.e01442

Cited by 6 publications

(6 citation statements)

References 46 publications

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“…Warming increased the GI for five species, which indicates that warming promotes the germination capacity of seeds for these species. Our result is consistent with other studies showing that warming could increase GI for specific species (Wei et al 2020;Cheng et al 2022). The highest GI values were calculated for P. asperata without cold stratification.…”

Section: Effects Of Warming Without Cold Stratification On the Seed G...supporting

confidence: 94%

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Effects of warming on seed germination of woody species in temperate secondary forests

et al. 2023

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Seed germination, a critical stage of the plant life cycle providing a link between seeds and seedlings, is commonly temperature‐dependent. The global average surface temperature is expected to rise, but little is known about the responses of seed germination of woody plants in temperate forests to warming. In the present study, dried seeds of 23 common woody species in temperate secondary forests were incubated at three temperature sequences without cold stratification and after experiencing cold stratification. We calculated five seed germination indices and the comprehensive membership function value that summarized the above indicators. Compared to the control, +2 and +4 °C treatments without cold stratification shortened germination time by 14% and 16% and increased the germination index by 17% and 26%, respectively. For stratified seeds, +4 °C treatment increased germination percentage by 49%, and +4 and +2 °C treatments increased duration of germination and the germination index, and shortened mean germination time by 69%, 458%, 29% and 68%, 110%, 12%, respectively. The germination of Fraxinus rhynchophylla and Larix kaempferi were most sensitive to warming without and with cold stratification, respectively. Seed germination of shrubs was the least sensitive to warming among functional types. These findings indicate warming (especially extreme warming) will enhance the seedling recruitment of temperate woody species, primarily via shortening the germination time, particularly for seeds that have undergone cold stratification. In addition, shrubs might narrow their distribution range

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Section: Effects Of Warming Without Cold Stratification On the Seed G...supporting

confidence: 94%

“…Our result is consistent with other studies showing that warming could increase GI for specific species (Wei et al . 2020; Cheng et al . 2022).…”

Section: Discussionmentioning

confidence: 99%

Effects of warming on seed germination of woody species in temperate secondary forests

et al. 2023

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“…Obtaining high germination percentages in this temperature interval can be explained by the fact that these temperatures favor the absorption of water by the seeds, the improvement of their enzymatic process and their respiration as well as the solubilization of stored nutrients, therefore, facilitating their utilization (Wei et al, 2021).This thermal optimum corresponds to the average temperatures of the autumn season (≈ 20 °C) that characterize this species' native environment where germination takes place. Moreover, Soil survey staff (2014) categorizes the Mediterranean region's soils as "xeric" in reference to the winter's significant precipitation, followed by the summer's dry period, inducing an average annual soil temperature between 15 °C and 22 °C.…”

Section: Discussionmentioning

confidence: 89%

Seed germination behavior of Teucrium santae Quézel & Simonneau: a vulnerable and endemic Lamiaceae (Northwest Algeria)

Bentekhici,

Mehdadi,

Latreche

2023

Folia Oecologica

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As part of the ex-situ conservation of the rare plant species Teucrium santae (Lamiaceae), which is native to Algeria flora, we conducted this study under controlled conditions to determine the optimal circumstances for the germination of its seeds in terms of light, temperature, and water stress. The seeds showed a double dormancy that could be overcome using scarification with sulfuric acid combined with soaking in Gibberellic acid at 1,500 ppm. The seed’s photosensitivity was tested afterward and found to be indifferent. The highest final germination percentage (75%) was obtained at a temperature of 20 °C. The temperature has no significant effect on the velocity coefficient, unlike the initial germination day and the mean germination time which decrease with increasing temperature. On the opposite of the velocity coefficient, water stress results in a tremendous depressive effect on the final germination percentage, initial germination time and mean germination time. The value of –1.2 MPa constitutes the water potential beyond which germination becomes impossible.

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“…Temperature can speed up germination within a particular range, but extremes in temperature can hinder germination due to membrane permeability, membrane-binding activity, and the denaturation of enzymes [ 67 , 68 ]. The probable explanation is that suitable temperatures facilitate water uptake by the seed, enhance enzymatic processes and respiration, and store nutrients in a soluble state that is easy to use [ 69 ]. Understanding the response of plants to temperature not only helps us to understand their ecological adaptations, but also helps in developing effective vegetation restoration strategies [ 70 ].…”

Section: Discussionmentioning

confidence: 99%

The Impact of Water Potential and Temperature on Native Species’ Capability for Seed Germination in the Loess Plateau Region, China

Hu,

He,

Wang

et al. 2024

Plants

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Global warming is increasing the frequency and intensity of heat waves and droughts. One important phase in the life cycle of plants is seed germination. To date, the association of the temperature and water potential thresholds of germination with seed traits has not been explored in much detail. Therefore, we set up different temperature gradients (5–35 °C), water potential gradients (−1.2–0 MPa), and temperature × water potential combinations for nine native plants in the Loess Plateau region to clarify the temperature and water combinations suitable for their germination. Meanwhile, we elucidated the temperature and water potential thresholds of the plants and their correlations with the mean seed mass and flatness index by using the thermal time and hydrotime models. According to our findings, the germination rate was positively correlated with the germination percentage and water potential, with the former rising and the latter decreasing as the temperature increased. Using the thermal time and hydrotime models, the seed germination thresholds could be predicted accurately, and the germination thresholds of the studied species varied with an increase in germination percentage. Moreover, temperature altered the impact of water potential on the germination rate. Overall, the base water potential for germination, but not the temperature threshold, was negatively correlated with mean seed mass and was lower for rounder seeds than for longer seeds. This study contributes to improving our understanding of the seed germination characteristics of typical plants and has important implications for the management and vegetation restoration of degraded grasslands.

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Effects of temperature and water potential on seed germination of 13 Poa L. species in the Qinghai-Tibetan Plateau

Cited by 6 publications

References 46 publications

Effects of warming on seed germination of woody species in temperate secondary forests

Effects of warming on seed germination of woody species in temperate secondary forests

Seed germination behavior of Teucrium santae Quézel & Simonneau: a vulnerable and endemic Lamiaceae (Northwest Algeria)

The Impact of Water Potential and Temperature on Native Species’ Capability for Seed Germination in the Loess Plateau Region, China

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