Effects of Warming and N Deposition on the Physiological Performances of Leymus secalinus in Alpine Meadow of Qinghai-Tibetan Plateau

Shen, Hao; Dong, Shikui; Li, Shuai; Wang, Wenying; Xiao, Jianru; Yang, Mingyue; Zhang, Jing; Gao, Xiaoxia; Xu, Yudan; Liu, Shiliang; Dong, Qingyu; Zhou, Huakun; Yeomans, Jane C.

doi:10.3389/fpls.2019.01804

Cited by 25 publications

(13 citation statements)

References 72 publications

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“…2), indicating that F v / F m may not be a sensitive indicator for drought‐stressed C. mongolicum seedlings. Inconsistent with the findings of Shen et al (2020) and Wang & Chen (2019) that additional N improves chlorophyll content, we found that N inputs significantly decreased chlorophyll a and a + b in the assimilating shoots of C. mongolicum seedlings (Figure S1). This may be because the influences of N addition on chlorophyll are species‐specific (Zhang et al 2017), and the differences in structure and functions between foliage and assimilating shoots might explain these disparate phenomena.…”

Section: Discussionsupporting

confidence: 90%

Involvement of soluble proteins in growth and metabolic adjustments of drought‐stressed Calligonum mongolicum seedlings under nitrogen addition

et al. 2020

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The planting of seedlings is the most effective measure for vegetation restoration. However, this practice is challenging in desert ecosystems where water and nutrients are scarce. Calligonum mongolicum is a sand-fixing pioneer shrub species, and its adaptive strategy for nitrogen (N) deposition and drought is poorly understood. • Thus, in a pot experiment, we studied the impacts of four N levels (0, 3, 6, 9 gNÁm −2-Áyear −1) under drought or a well-watered regime on multiple eco-physiological responses of 1-year-old C. mongolicum seedlings. • Compared to well-watered conditions, drought considerably influenced seedling growth by impairing photosynthesis, osmolyte accumulation and activity of superoxide dismutase and enzymes related to N metabolism. Nitrogen addition improved the productivity of drought-stressed seedlings, as revealed by increased water use efficiency, enhanced superoxide dismutase and nitrite reductase activity and elevated N and phosphorus (P) levels in seedlings. Nevertheless, the addition of moderate to high levels of N (6-9 gNÁm −2 Áyear −1) impaired net photosynthesis, osmolyte accumulation and nitrate reductase activity. N addition and water regimes did not markedly change the N:P ratios of aboveground parts; while more biomass and nutrients were allocated to fine roots to assimilate the insufficient resources. Soluble protein in assimilating shoots might play a vital role in adaptation to the desert environment. • The response of C. mongolicum seedlings to N addtion and drought involved an interdependency between soluble protein and morphological, physiological and biochemical processes. These findings provide an important reference for vegetation restoration in arid lands under global change.

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Section: Discussionsupporting

confidence: 90%

Involvement of soluble proteins in growth and metabolic adjustments of drought‐stressed Calligonum mongolicum seedlings under nitrogen addition

et al. 2020

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“…Warming increase the temperature of air and soil, and reduce soil water content, finally leading to dramatic ecological effects on plants (Allison et al, 2018;Samaniego et al, 2018). Many studies found that warming-induced decrease in soil moisture might be the major reason of photosynthesis inhabitation (Reich et al, 2018;Shen et al, 2020). In our study, the decrease of soil moisture in OTCs did not cause soil drought (22.3%), so the presence of an OTC was not an additional source of drought stress (Pugnaire et al, 2020).…”

Section: Discussionmentioning

confidence: 46%

“…Interestingly, the P n of E. nutans decreased with increased temperature, while that of P. anserina increased. Shen et al (2020) also found that the P n of L. secalimus significantly decreased under warming, suggesting that warming can negatively limit plant photosynthesis. This is because the air temperature was high in the growing season (July), and thus the leaf temperature of E. nutans exceeded its optimal temperature, leading to a decrease in P n .…”

Section: Discussionmentioning

confidence: 87%

Leaf and Community Photosynthetic Carbon Assimilation of Alpine Plants Under in-situ Warming

Zhou

et al. 2021

Front. Plant Sci.

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The Tibetan Plateau is highly sensitive to elevated temperatures and has experienced significant climate warming in the last decades. While climate warming is known to greatly impact alpine ecosystems, the gas exchange responses at the leaf and community levels to climate warming in alpine meadow ecosystems remain unclear. In this study, the alpine grass, Elymus nutans, and forb, Potentilla anserina, were grown in open-top chambers (OTCs) for 3 consecutive years to evaluate their response to warming. Gas exchange measurements were used to assess the effects of in-situ warming on leaf- and community-level photosynthetic carbon assimilation based on leaf photosynthetic physiological parameters. We introduced a means of up-scaling photosynthetic measurements from the leaf level to the community level based on six easily measurable parameters, including leaf net photosynthetic rate, fresh leaf mass per unit leaf area, fresh weight of all plant leaves in the community, the percentage of healthy leaves, the percentage of received effective light by leaves in the community, and community coverage. The community-level photosynthetic carbon assimilation and productivity all increased with warming, and the net photosynthetic rate at the leaf level was significantly higher than at the community level. Under elevated temperature, the net photosynthetic rate of E. nutans decreased, while that of P. anserina increased. These results indicated that climate warming may significantly influence plant carbon assimilation, which could alter alpine meadow community composition in the future.

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“…In the past years, a genome-wide association study (GWAS) was performed to identify QTLs for GER resistance using single-locus models (Han et al 2018 ). However, multi-locus models such as fixed and random model circulating probability unification (FarmCPU, Liu et al 2016 ) have been found to be more powerful in detecting SNP-trait associations with a lower rate of false positives and false negatives than single SNP-based models, especially for traits with complex genetic architecture (Abed and Belzile 2019 ; Kaler et al 2020 ; Malik et al 2019 ; Miao et al 2019 ; Odilbekov et al 2019 ; Wei et al 2017 ; Xu et al 2018 ; Zhang et al 2019 ; Zhu et al 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Exploiting genetic diversity in two European maize landraces for improving Gibberella ear rot resistance using genomic tools

et al. 2020

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Key message High genetic variation in two European maize landraces can be harnessed to improve Gibberella ear rot resistance by integrated genomic tools. Abstract Fusarium graminearum (Fg) causes Gibberella ear rot (GER) in maize leading to yield reduction and contamination of grains with several mycotoxins. This study aimed to elucidate the molecular basis of GER resistance among 500 doubled haploid lines derived from two European maize landraces, “Kemater Landmais Gelb” (KE) and “Petkuser Ferdinand Rot” (PE). The two landraces were analyzed individually using genome-wide association studies and genomic selection (GS). The lines were genotyped with a 600-k maize array and phenotyped for GER severity, days to silking, plant height, and seed-set in four environments using artificial infection with a highly aggressive Fg isolate. High genotypic variances and broad-sense heritabilities were found for all traits. Genotype-environment interaction was important throughout. The phenotypic (r) and genotypic ($${r}_{g}$$ r g ) correlations between GER severity and three agronomic traits were low (r = − 0.27 to 0.20; $${r}_{g}\hspace{0.17em}$$ r g = − 0.32 to 0.22). For GER severity, eight QTLs were detected in KE jointly explaining 34% of the genetic variance. In PE, no significant QTLs for GER severity were detected. No common QTLs were found between GER severity and the three agronomic traits. The mean prediction accuracies ($$\rho $$ ρ ) of weighted GS (wRR-BLUP) were higher than $$\rho $$ ρ of marker-assisted selection (MAS) and unweighted GS (RR-BLUP) for GER severity. Using KE as the training set and PE as the validation set resulted in very low $$\rho $$ ρ that could be improved by using fixed marker effects in the GS model.

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Effects of Warming and N Deposition on the Physiological Performances of Leymus secalinus in Alpine Meadow of Qinghai-Tibetan Plateau

Cited by 25 publications

References 72 publications

Involvement of soluble proteins in growth and metabolic adjustments of drought‐stressed Calligonum mongolicum seedlings under nitrogen addition

Involvement of soluble proteins in growth and metabolic adjustments of drought‐stressed Calligonum mongolicum seedlings under nitrogen addition

Leaf and Community Photosynthetic Carbon Assimilation of Alpine Plants Under in-situ Warming

Exploiting genetic diversity in two European maize landraces for improving Gibberella ear rot resistance using genomic tools

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