Interactive Effects of Epichloë Endophyte, Dormancy-Breaking Treatments and Geographic Origin on Seed Germination of Achnatherum inebrians

YaQi, Chen; Su, Kaile; Li, Chunjie; White, James F.

doi:10.3390/microorganisms9112183

Cited by 12 publications

(12 citation statements)

References 37 publications

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“…The changes in soil properties might result from the plant growth and their C inputs. Furthermore, poisonous grass, Achnatherum inebrians , appeared following heavy grazing and was rarely taken by animals in the grasslands [ 48 ]. It indicated that the growth of this poisonous grass could contribute to the accumulation of litter.…”

Section: Discussionmentioning

confidence: 99%

Mowing Facilitated Shoot and Root Litter Decomposition Compared with Grazing

Zhang

Wei

Liu

et al. 2022

Plants

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Shoot and root litter are two major sources of soil organic carbon, and their decomposition is a crucial nutrient cycling process in the ecosystem. Altitude and land use could affect litter decomposition by changing the environment in mountain grassland ecosystems. However, few studies have investigated the effects of land use on litter decomposition in different altitudes. We examined how land-use type (mowing vs. grazing) affected shoot and root litter decomposition of a dominant grass (Bromus inermis) in mountain grasslands with two different altitudes in northwest China. Litterbags with 6 g of shoot or root were fixed in the plots to decompose for one year. The mass loss rate of the litter, and the environmental attributes related to decomposition, were measured. Litter decomposed faster in mowing than grazing plots, resulting from the higher plant cover and soil moisture but lower bulk density, which might promote soil microbial activities. Increased altitude promoted litter decomposition, and was positively correlated with soil moisture, soil organic carbon (SOC), and β-xylosidase activity. Our results highlight the diverse influences of land-use type on litter decomposition in different altitudes. The positive effects of mowing on shoot decomposition were stronger in lower than higher altitude compared to grazing due to the stronger responses of the plant (e.g., litter and aboveground biomass) and soil (e.g., soil moisture, soil bulk density, and SOC). Soil nutrients (e.g., SOC and soil total nitrogen) seemed to play essential roles in root decomposition, which was increased in mowing plots at lower altitude and vice versa at higher altitude. Therefore, grazing significantly decreased root mass loss at higher altitude, but slightly increased at lower altitude compared to mowing. Our results indicated that the land use might variously regulate the innate differences of the plant and edaphic conditions along an altitude gradient, exerting complex impacts in litter decomposition and further influencing carbon and nutrient cycling in mountain grasslands.

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Section: Discussionmentioning

confidence: 99%

Mowing Facilitated Shoot and Root Litter Decomposition Compared with Grazing

Zhang

Wei

Liu

et al. 2022

Plants

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“…It is still unclear how seed bacteria influence germination behavior [ 6 ]. Similar to bacteria in the rhizosphere, seed bacteria have been thought to supply or degrade phytohormones, which might interrupt signaling pathways, and thereby phenological responses of host plants [ 10 , 47 ]. Ethylene is a phytohormone that stimulates seed germination by interacting with gibberellins and abscisic acid [ 48 , 49 ].…”

Section: Discussionmentioning

confidence: 99%

Effects of Seed Endophytic Bacteria on Life History and Reproductive Traits in a Cosmopolitan Weed, Capsella bursa-pastoris

Choi¹,

Kim²,

Jeong³

et al. 2022

Plants

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Diverse bacteria inhabit plant seeds, and at least some of them can enhance plant performance at the early developmental stage. However, it is still inconclusive whether seed bacteria can influence post-germination traits and their contribution to plant fitness. To explore the evolutionary and ecological consequences of seed endophytic bacteria, we isolated four bacterial strains from the seeds of an annual weedy plant species, Capsella bursa-pastoris, and conducted a common garden experiment using seeds inoculated by isolated bacteria. Seeds infected by bacteria tended to germinate in spring rather than in autumn. Bacterial treatment also altered the expression of plant life history and reproductive traits, including flowering dates, rosette diameter at bolting, number of inflorescences, and fruit production. The results of the path analyses suggested that such effects of bacterial treatments were due to bacterial inoculation as well as germination delayed until spring. Spring germinants with bacterial infection showed a weaker association between post-germination traits and relative fitness than those without bacterial infection. These results suggest that seed bacteria likely affect the expression of post-germination traits directly or indirectly by delaying the germination season. An altered contribution of plant traits to relative fitness implies the influence of seed bacteria on the strength of natural selection.

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“…This genus comprises about 200 species of bacteria, which are almost ubiquitous in nature, such as in plants, soil, air and water environments 2019) found that compared with the A. inebrians seeds collected from desert and arid grassland origins, the germination rate of the seeds collected from alpine regions was higher at low temperatures. Chen et al (2021) showed that the interaction between Epichloë endophyte and warm water soaking treatment increased the germination of A. inebrians seeds from the Xiahe site, with seedlings having increased content of soluble sugar, IAA, and GA.…”

Section: Introductionmentioning

confidence: 99%

Effects of interaction of Epichloë gansuensis and Bacillus strains on the seed germination and seedling growth in Achnatherum inebrians plants

Zhao

Nie

Zhang

et al. 2023

Preprint

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Previous studies have confirmed that Bacillus and also Epichloë fungal endophytes can promote seed germination of grasses and induce stress resistance. However, the effects of interactions between Bacillusand endophyte on seed germination and seedling growth of grasses have not been well studied. In this study, Epichloë gansuensis endophyte-infected and endophyte-free Achnatherum inebrians seeds, and two month old seedlings, were inoculated with 12 Bacillus strains, and then effects of the treatments on four germination indicators and eight growth parameters were determined. The results showed that the interaction between E. gansuensis and Bacillus strains significantly (P<0.05) increased seed germination and the growth of A. inebrians. Interestingly, Bacillus strain inoculation, except for strain B96, provided a greater increase in growth on the 2-3 month old seedlings than the increase of growth with young seedlings. The germination rate of A. inebriansinoculated with the 12 strains ranged from 93.7% to 99%. Compared with other strains, B18 and B419 showed greater increases in growth of 2-3 months old plants. Moreover, the study employed a membership function value to assess the growth-promoting ability of the 12 Bacillusstrains on A. inebrians as an integrative tool for screening strains. Among the 12 strains, the B419 strain showed the best growth-promoting ability, while B106 was the worst strain. These results indicate that the B419 strain has potential value in agricultural production, and mechanisms of plant growth promotion will be further studied.

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Interactive Effects of Epichloë Endophyte, Dormancy-Breaking Treatments and Geographic Origin on Seed Germination of Achnatherum inebrians

Cited by 12 publications

References 37 publications

Mowing Facilitated Shoot and Root Litter Decomposition Compared with Grazing

Mowing Facilitated Shoot and Root Litter Decomposition Compared with Grazing

Effects of Seed Endophytic Bacteria on Life History and Reproductive Traits in a Cosmopolitan Weed, Capsella bursa-pastoris

Effects of interaction of Epichloë gansuensis and Bacillus strains on the seed germination and seedling growth in Achnatherum inebrians plants

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