scholarly journals Ethylene enhances root water transport and aquaporin expression in trembling aspen (Populus tremuloides) exposed to root hypoxia

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Xiangfeng Tan ◽  
Mengmeng Liu ◽  
Ning Du ◽  
Janusz J. Zwiazek
Keyword(s):  
Gas Exchange ◽  
Water Transport ◽  
Populus Tremuloides ◽  
Leaf Gas Exchange ◽  
Hydraulic Conductance ◽  
Root Hydraulic Conductance ◽  
Trembling Aspen ◽  
Expression Levels ◽  
Root Hypoxia ◽  
Exogenous Ethylene

Abstract Background Root hypoxia has detrimental effects on physiological processes and growth in most plants. The effects of hypoxia can be partly alleviated by ethylene. However, the tolerance mechanisms contributing to the ethylene-mediated hypoxia tolerance in plants remain poorly understood. Results In this study, we examined the effects of root hypoxia and exogenous ethylene treatments on leaf gas exchange, root hydraulic conductance, and the expression levels of several aquaporins of the plasma membrane intrinsic protein group (PIP) in trembling aspen (Populus tremuloides) seedlings. Ethylene enhanced net photosynthetic rates, transpiration rates, and root hydraulic conductance in hypoxic plants. Of the two subgroups of PIPs (PIP1 and PIP2), the protein abundance of PIP2s and the transcript abundance of PIP2;4 and PIP2;5 were higher in ethylene-treated trembling aspen roots compared with non-treated roots under hypoxia. The increases in the expression levels of these aquaporins could potentially facilitate root water transport. The enhanced root water transport by ethylene was likely responsible for the increase in leaf gas exchange of the hypoxic plants. Conclusions Exogenous ethylene enhanced root water transport and the expression levels of PIP2;4 and PIP2;5 in hypoxic roots of trembling aspen. The results suggest that ethylene facilitates the aquaporin-mediated water transport in plants exposed to root hypoxia.

An update on the regulation of photosynthesis by thylakoid ion channels and transporters in Arabidopsis

2017 ◽  
Vol 161 (1) ◽  
pp. 16-27 ◽  
Author(s):  
Cornelia Spetea ◽  
Andrei Herdean ◽  
Guillaume Allorent ◽  
Luca Carraretto ◽  
Giovanni Finazzi ◽  
...  
Keyword(s):  
Ion Channels ◽  
Regulation Of Photosynthesis

Endogenous Regulation of Inflammatory Pain by T-cell-derived Opioids

2014 ◽  
Vol 20 (10) ◽  
pp. 1870-1877 ◽  
Author(s):  
Lilian Basso ◽  
Jérôme Boué ◽  
Arnaud Bourreille ◽  
Gilles Dietrich
Keyword(s):  
T Cell ◽  
Inflammatory Pain ◽  
Endogenous Regulation

Endogenous regulation and the firm's regulatory expenditures

1989 ◽  
Vol 21 (3) ◽  
pp. 375-385 ◽  
Author(s):  
Im Bae-Geun ◽  
L.Kaserman David ◽  
Francois Melese
Keyword(s):  
Endogenous Regulation

scholarly journals Foliar phosphorus supply and CO2 assimilation in common bean (Phaseolus vulgaris L.) under water deficit

2006 ◽  
Vol 18 (3) ◽  
pp. 407-411 ◽  
Author(s):  
Mauro G. dos Santos ◽  
Rafael V. Ribeiro ◽  
Marcelo G. Teixeira ◽  
Ricardo F. de Oliveira ◽  
Carlos Pimentel
Keyword(s):  
Phaseolus Vulgaris ◽  
Common Bean ◽  
Water Deficit ◽  
Co2 Assimilation ◽  
Assimilation Rate ◽  
Phaseolus Vulgaris L ◽  
Co2 Assimilation Rate ◽  
Net Co2 Assimilation ◽  
Foliar Phosphorus ◽  
Regulation Of Photosynthesis

Two common bean cultivars were grown in pots under greenhouse conditions. Plants were submitted to a foliar Pi spray two days before suspending irrigation, what enhanced net CO2 assimilation rate of Ouro Negro cultivar but did not change significantly the photosynthesis of Carioca cultivar under both water deficit and rehydration periods. The results revealed that a foliar Pi spray induced an up-regulation of photosynthesis in common bean under mild water deficit, with this effect being genotype-dependent.

scholarly journals Regulation of Photosynthesis during Abiotic Stress-Induced Photoinhibition

2015 ◽  
Vol 8 (9) ◽  
pp. 1304-1320 ◽  
Author(s):  
Mayank Anand Gururani ◽  
Jelli Venkatesh ◽  
Lam Son Phan Tran
Keyword(s):  
Abiotic Stress ◽  
Regulation Of Photosynthesis

scholarly journals Na2CO3-Responsive Photosynthetic and ROS Scavenging Mechanisms in Chloroplasts of Alkaligrass Revealed by Phosphoproteomics

2019 ◽  
Author(s):  
Jinwei Suo ◽  
Heng Zhang ◽  
Qi Zhao ◽  
Nan Zhang ◽  
Yongxue Zhang ◽  
...  
Keyword(s):  
Quantitative Proteomics ◽  
Energy Homeostasis ◽  
Thermal Dissipation ◽  
Wild Type ◽  
Ros Scavenging ◽  
Fructose Bisphosphate ◽  
Ps Ii ◽  
Ros Homeostasis ◽  
Fructose Bisphosphate Aldolase ◽  
Regulation Of Photosynthesis

Alkali-salinity exerts severe osmotic, ionic and high-pH stresses to plants. To understand the alkali-salinity responsive mechanisms underlying photosynthetic modulation and reactive oxygen species (ROS) homeostasis, physiological and diverse quantitative proteomics analyses of alkaligrass (Puccinellia tenuiflora) under Na2CO3 stress were conducted. In addition, Western blot, real-time PCR, and transgenic techniques were applied to validate the proteomic results and test the functions of the Na2CO3-responsive proteins. A total of 104 and 102 Na2CO3-responsive proteins were identified in leaves and chloroplasts, respectively. In addition, 84 Na2CO3-responsive phosphoproteins were identified, including 56 new phosphorylation sites in 56 phosphoproteins from chloroplasts, which are crucial for the regulation of photosynthesis, ion transport, signal transduction and energy homeostasis. A full-length PtFBA encoding an alkaligrass chloroplastic fructose-bisphosphate aldolase (FBA) was overexpressed in wild-type cells of cyanobacterium Synechocystis sp. Strain PCC 6803, leading to enhanced Na2CO3 tolerance. All these results indicate that thermal dissipation, state transition, cyclic electron transport, photorespiration, repair of photosystem (PS) II, PSI activity, and ROS homeostasis were altered in response to Na2CO3 stress, and they have improved our understanding of the Na2CO3-responsive mechanisms in halophytes.

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