Distribution of Stipa purpurea steppe in the Northeastern Qinghai-Xizang Plateau (China)

Yue, Pengpeng; Lü, Xuefeng; Ye, R. R.; Zhang, C. X.; Yang, Shengnan; Zhou, Yulu; Peng, Min

doi:10.1134/s1067413611010140

Cited by 25 publications

(15 citation statements)

References 9 publications

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“…2C). Although variation in seed characteristics is a common phenomenon, elucidation of its sources and consequences in S. purpurea is still needed because of the ecological importance of this species on the Qinghai-Tibet Plateau (Liu et al 2011;Yue et al 2011). …”

Section: Discussionmentioning

confidence: 99%

“…It may differ from the final official version of record. 5 steppe is one of the most important alpine ecosystems throughout the Qinghai-Tibet Plateau and plays a vital role in preserving and stabilizing landscape heterogeneity and diversity (Yue et al 2011). …”

Section: Page 3 Of 41mentioning

confidence: 99%

“…The three most important environmental factors affecting the distribution of the S. purpurea steppe are altitude, longitude, and latitude (Yue et al 2011). As environmental conditions show considerable regional variation on the Qinghai-Tibet Plateau, the biological characteristics of plants must conform to the local environment.…”

Section: Page 3 Of 41mentioning

confidence: 99%

“…(Poaceae) is endemic to the Qinghai-Tibet and Pamir plateaus and the high mountains of Central Asia (Yue et al 2011). Because of its strong resistance to cold, drought, and high winds, the species grows well in harsh alpine environments (Yue et al 2011 For personal use only. This Just-IN manuscript is the accepted manuscript prior to copy editing and page composition.…”

Section: Page 3 Of 41mentioning

confidence: 99%

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Variations in seed characteristics among and within Stipa purpurea populations on the Qinghai–Tibet Plateau

Yin

Yang

et al. 2015

Botany

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Variation in seed size is common among plant species, populations, and individuals. On the Qinghai-Tibet Plateau, previous studies have mainly focused on interspecific variation in seed size, with little information available regarding intraspecific variation. The alpine steppe is among the most important vegetation types on the plateau, where it plays a vital role in preserving landscape heterogeneity and diversity. Stipa purpurea Griseb., endemic to the Qinghai-Tibet Plateau, is the predominant species of the alpine steppe. In the present study, we measured seed characteristics of nine S. purpurea populations and analyzed possible sources and consequences of variation in these characteristics. Seed characteristics varied greatly among and within populations. Our findings suggest that variation in seed size and awn length may affect germination and dispersal, respectively. Surprisingly, environmental factors rather than genome size were significantly correlated with seed size. For example, relative humidity and number of windy days were strongly correlated with seed size and awn length, respectively. We believe that variation in seed characteristics is a consequence of complex environmental conditions correlated with longitude and latitude. The results indicated that variation in seed characteristics of S. purpurea is an adaptation to environmental conditions.

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Section: Discussionmentioning

confidence: 99%

Section: Page 3 Of 41mentioning

confidence: 99%

Section: Page 3 Of 41mentioning

confidence: 99%

Section: Page 3 Of 41mentioning

confidence: 99%

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Variations in seed characteristics among and within Stipa purpurea populations on the Qinghai–Tibet Plateau

Yin

Yang

et al. 2015

Botany

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“…With low average annual temperatures of less than 5 °C and annual precipitations between 100 and 400 mm, the region is characterized by a harsh environment and fragile ecosystems (Gang et al, ). Alpine grasslands are the most dominant ecosystem on the Tibetan Plateau with diverse grassland types, including alpine meadows, alpine steppes, and alpine desert steppes (Yue et al, ). Therefore, the Tibetan Plateau is one of the most important pastoral areas in China and has served as the dominant pastures for Tibetan communities.…”

Section: Methodsmentioning

confidence: 99%

Grazing enhances soil nutrient effects: Trade‐offs between aboveground and belowground biomass in alpine grasslands of the Tibetan Plateau

2017

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Understanding the impact of grazing patterns on grassland production is of fundamental importance for grassland conservation and management. The objective of this study is to obtain an understanding of the trade‐offs between aboveground biomass and belowground biomass, which are influenced by environmental factors in free grazing (FG) and grazing exclusion (GE) alpine grasslands on the Tibetan Plateau. We explored the relationships between the trade‐off and environmental factors using correlation analysis, a generalized additive model and a structural equation model, and then found that the key factors that determine trade‐off showed differences in FG and GE grasslands and that the final structural equation modeling result explained that 96% (path coefficient = 0.96) and 65% (path coefficient = 0.65) of the variations in the trade‐off were due to FG or GE classifications, respectively. The results demonstrated that soil organic carbon, soil carbon/soil nitrogen, and soil available nitrogen affect the trade‐off between aboveground and belowground biomass in FG grasslands more obviously than in GE grasslands. However, the effects of growing season temperature on the trade‐off were insignificant, −0.218 and −0.181 in FG and GE grasslands, respectively. FG increased the soil bulk density, which resulted in an alteration in the soil pore size distribution and a greater resistance to root penetration. In addition, FG affected the level of soil nutrition, which will affect the nitrogen mineralization of decomposition and absorption, as well as the root biomass. Consequently, this study can provide guidance to improve the quality of grassland.

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A novel Ap2/ERF transcription factor from Stipa purpurea leads to enhanced drought tolerance in Arabidopsis thaliana

Yang

Dong

et al. 2016

Plant Cell Rep

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SpERF1 acts as a positive regulator, contributing to drought stress tolerance in A. thaliana through activating DRE/CRT elements in the promoters of abiotic stress-responsive genes. Stipa purpurea is an endemic perennial grass species in alpine arid and semi-arid meadows on the Qinghai-Xizang Plateau, which is highly tolerant against drought and cold. ERF transcription factors are known to regulate gene expression under abiotic and biotic treatments. Herein, we isolated a full-length ERF gene CDS from S. purpurea named SpERF1, which was induced by drought, cold, and jasmonic acid stresses. Subcellular localization revealed that SpERF1 is a nuclear protein, consistent with its roles as a transcription factor. Overexpression of SpERF1 enhanced drought tolerance of transgenic Arabidopsis thaliana via the activation of DRE/CRT elements in the promoters of abiotic stress-responsive genes. Furthermore, increased accumulation of proline indicated that SpERF1 might be involved in proline synthesis in the transgenic lines, allowing them to have a better buffering capacity and membrane protection under drought stress. This study indicated that SpERF1 might be an attractive target in the genetic engineering for improving stress tolerance in other crops. Moreover, SpERF1 protein function analysis increased our understanding of S. purpurea's ability to adapt to the adverse conditions of the Qinghai-Xizang Plateau.

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Distribution of Stipa purpurea steppe in the Northeastern Qinghai-Xizang Plateau (China)

Cited by 25 publications

References 9 publications

Variations in seed characteristics among and within Stipa purpurea populations on the Qinghai–Tibet Plateau

Variations in seed characteristics among and within Stipa purpurea populations on the Qinghai–Tibet Plateau

Grazing enhances soil nutrient effects: Trade‐offs between aboveground and belowground biomass in alpine grasslands of the Tibetan Plateau

A novel Ap2/ERF transcription factor from Stipa purpurea leads to enhanced drought tolerance in Arabidopsis thaliana

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