ORCID Profile
0000-0001-9224-0738
Current Organisations
University of Tasmania
,
Foshan University
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Publisher: Springer Science and Business Media LLC
Date: 06-02-2020
Publisher: CSIRO Publishing
Date: 2020
DOI: 10.1071/FP19107
Abstract: The aim of this study was to investigate effects of the hydrogen-rich water (HRW) on the vegetable growth, and explore the possibility of applying HRW for protected cultivation of vegetables. Results showed that compared with control, HRW treatment significantly promoted fresh weight, hypocotyl length and root length of mung bean seedlings. The strongest stimulation was observed for 480 μM H2 (60% of saturated HRW concentration) treatment. This concentration was used in the following experiments. The enhanced cell elongation was correlated with the changes in the level of endogenous phytohormones. In the dark-grown hypocotyls and roots of mung bean seedlings, HRW significantly increased the content of IAA and GA3. Addition of GA3 enhanced the hypocotyl elongation only. uniconazole, an inhibitor of GA3 biosynthesis, inhibited HRW-induced hypocotyl elongation, but did not affect root elongation. Exogenous application of IAA promoted HRW effects on elongation of both the hypocotyl and the root, while the IAA biosynthesis inhibitor TIBA negated the above affects. The general nature of HRW-induced growth-promoting effects was further confirmed in experiments involving cucumber and radish seedlings. Taken together, HRW treatment promoted growth of seedlings, by stimulating elongation of hypocotyl and root cells, via HRW-induced increase in GA and IAA content in the hypocotyl and the root respectively.
Publisher: Springer India
Date: 2016
Publisher: Elsevier BV
Date: 11-2019
DOI: 10.1016/J.PLANTSCI.2019.110218
Abstract: Salt stress is a major constraint to plant growth and development, and plants have developed sophisticated mechanisms to cope with it. AtAGO2, an argonaute protein, is known to play an important role in plant adaptation to salt stress however, the molecular mechanism of this phenomenon remains essentially unexplored. Here, we performed the yeast two-hybrid assay and found an R3H-domain containing protein, designated as MUG13.4, interacting with AtAGO2. Further bimolecular fluorescence complement (BiFC), glutathione-S-transferase (GST) pull-down, and co-immunoprecipitation (Co-IP) assays confirmed that MUG13.4 interacted with AtAGO2, and MUG13.4 could affect the slicing activity of AtAGO2 associated with miR173. MUG13.4 and AtAGO2 were both predominantly expressed in seeds and roots. Phenotypic analyses of the single and double mutants under salt stress confirmed involvement of MUG13.4-AtAGO2 complex as a component of the salt tolerance mechanism. The mug13.4×ago2-1 double mutant displayed retarded growth and hypersensitivity to salt stress that was more pronounced than in mug13.4 or atago2-1 single mutants. TAS1c-tasiRNA generating system in Nicotiana benthamiana revealed that MUG13.4 could influence the slicing activity of AtAGO2. We also found that MUG13.4 increasingly changed the phenotype of slicer-defected mutants of AtAGO2 in response to salt stress. These findings suggested that the function of AtAGO2 upon salt stress was dependent on MUG13.4. Further investigation suggested that AtAGO2 improved Arabidopsis tolerance to salt stress by affecting operation of the SOS signaling cascade at the transcript level. Taken together, these findings reveal a novel function of MUG13.4 in adjusting Arabidopsis adaptation to salt stress.
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 05-2021
Publisher: Frontiers Media SA
Date: 18-01-2021
Abstract: Helianthus annuus L. is an important oilseed crop, which exhibits moderate salt tolerance and can be cultivated in areas affected by salinity. Using patch-cl electrophysiology, we have characterized Na + influx and K + efflux conductances in protoplasts of salt-tolerant H. annuus L. hybrid KBSH-53 under high salinity. This work demonstrates that the plasma membrane of sunflower root cells has a classic set of ionic conductances dominated by K + outwardly rectifying channels (KORs) and non-selective cation channels (NSCCs). KORs in sunflower show extreme Na + sensitivity at high extracellular [Ca 2+ ] that can potentially have a positive adaptive effect under salt stress (decreasing K + loss). Na + influx currents in sunflower roots demonstrate voltage-independent activation, lack time-dependent component, and are sensitive to Gd 3+ . Sunflower Na + -permeable NSCCs mediate a much weaker Na + influx currents on the background of physiological levels of Ca 2+ as compared to other species. This suggests that sunflower NSCCs have greater Ca 2+ sensitivity. The responses of Na + influx to Ca 2+ correlates well with protection of sunflower growth by external Ca 2+ in seedlings treated with NaCl. It can be, thus, hypothesized that NaCl tolerance in sunflower seedling roots is programmed at the ion channel level via their sensitivity to Ca 2+ and Na + .
Publisher: MDPI AG
Date: 09-02-2020
Abstract: Cadmium (Cd) is present in many soils and, when entering the food chain, represents a major health threat to humans. Reducing Cd accumulation in plants is complicated by the fact that most known Cd transporters also operate in the transport of essential nutrients such as Zn, Fe, Mn, or Cu. This work summarizes the current knowledge of mechanisms mediating Cd uptake, radial transport, and translocation within the plant. It is concluded that real progress in the field may be only achieved if the transport of Cd and the above beneficial micronutrients is uncoupled, and we discuss the possible ways of achieving this goal. Accordingly, we suggest that the major focus of research in the field should be on the structure–function relations of various transporter isoforms and the functional assessment of their tissue-specific operation. Of specific importance are two tissues. The first one is a xylem parenchyma in plant roots a major “controller” of Cd loading into the xylem and its transport to the shoot. The second one is a phloem tissue that operates in the last step of a metal transport. Another promising and currently underexplored avenue is to understand the role of non-selective cation channels in Cd uptake and reveal mechanisms of their regulation.
Publisher: Oxford University Press (OUP)
Date: 30-05-2022
DOI: 10.1093/JXB/ERAC224
Abstract: Melatonin is a highly conserved and ubiquitous molecule that operates upstream of a broad array of receptors in animal systems. Since melatonin was discovered in plants in 1995, hundreds of papers have been published revealing its role in plant growth, development, and adaptive responses to the environment. This paper summarizes the current state of knowledge of melatonin’s involvement in regulating plant ion homeostasis and abiotic stress tolerance. The major topics covered here are: (i) melatonin’s control of H+-ATPase activity and its implication for plant adaptive responses to various abiotic stresses (ii) regulation of the reactive oxygen species (ROS)–Ca2+ hub by melatonin and its role in stress signaling and (iii) melatonin’s regulation of ionic homeostasis via hormonal cross-talk. We also show that the properties of the melatonin molecule allow its direct scavenging of ROS, thus preventing negative effects of ROS-induced activation of ion channels. The above ‘desensitization’ may play a critical role in preventing stress-induced K+ loss from the cytosol as well as maintaining basic levels of cytosolic Ca2+ required for optimal cell operation. Future studies should focus on revealing the molecular identity of transporters that could be directly regulated by melatonin and providing a bioinformatic analysis of evolutionary aspects of melatonin sensing and signaling.
Publisher: Oxford University Press (OUP)
Date: 04-05-2020
DOI: 10.1104/PP.20.00377
Publisher: Wiley
Date: 07-2015
DOI: 10.1111/PLB.12188
Abstract: Vast agricultural areas are affected by flooding, causing up to 80% yield reduction and resulting in multibillion dollar losses. Up to now, the focus of plant breeders was predominantly on detrimental effects of anoxia, while other (potentially equally important) traits were essentially neglected one of these is soil elemental toxicity. Excess water triggers a progressive decrease in soil redox potential, thus increasing the concentration of Mn(2+) that can be toxic to plants if above a specific threshold. This work aimed to quantify the relative contribution of Mn(2+) toxicity to waterlogging stress tolerance, using barley as a case study. Twenty barley (Hordeum vulgare) genotypes contrasting in waterlogging stress tolerance were studied for their ability to cope with toxic (1 mm) amounts of Mn(2+) in the root rhizosphere. Under Mn(2+) toxicity, chlorophyll content of most waterlogging-tolerant genotypes (TX9425, Yerong, CPI-71284-48 and CM72) remained above 60% of the control value, whereas sensitive genotypes (Franklin and Naso Nijo) had 35% less chlorophyll than 35% of controls. Manganese concentration in leaves was not related to visual Mn(2+) toxicity symptoms, suggesting that various Mn(2+) tolerance mechanisms might operate in different tolerant genotypes, i.e. avoidance versus tissue tolerance. The overall significant (r = 0.60) correlation between tolerance to Mn(2+) toxicity and waterlogging in barley suggests that plant breeding for tolerance to waterlogging traits may be advanced by targeting mechanisms conferring tolerance to Mn(2+) toxicity, at least in this species.
Publisher: Oxford University Press (OUP)
Date: 19-11-2016
DOI: 10.1093/JXB/ERV493
No related grants have been discovered for Xin HUANG.