Responses of leaf growth and gas exchanges to salt stress during reproductive stage in wild wheat relative Aegilops geniculata Roth. and wheat (Triticum durum Desf.)

Mguis, Khaled; Albouchi, Ali; Abassi, Mejda; Khadhri, Ayda; Ykoubi-Tej, Mbarka; Mahjoub, Asma; Brahim, Nadia Ben; Ouerghi, Zeineb

doi:10.1007/s11738-012-1185-6

Cited by 16 publications

(13 citation statements)

References 31 publications

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“…2). This is consistent with results from other species, including maize, sorghum (Niu et al, 2012), wheat (Yousfi et al, 2010;Mguis et al, 2013), rice (Sultana et al, 1999), and Arabidopsis (Stepien and Johnson, 2009). Regardless of this extreme decrease in photosynthesis, sugar and starch concentrations increased in source (leaf), transfer (cob), as well as sink (kernel) tissues (Fig.…”

Section: Salt Stress Inhibits Photosynthesis Respiration and Growthsupporting

confidence: 91%

Differential Role for Trehalose Metabolism in Salt-Stressed Maize

et al. 2015

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Little is known about how salt impacts primary metabolic pathways of C 4 plants, particularly related to kernel development and seed set. Osmotic stress was applied to maize (Zea mays) B73 by irrigation with increasing concentrations of NaCl from the initiation of floral organs until 3 d after pollination. At silking, photosynthesis was reduced to only 2% of control plants. Salt treatment was found to reduce spikelet growth, silk growth, and kernel set. Osmotic stress resulted in higher concentrations of sucrose (Suc) and hexose sugars in leaf, cob, and kernels at silking, pollination, and 3 d after pollination. Citric acid cycle intermediates were lower in salt-treated tissues, indicating that these sugars were unavailable for use in respiration. The sugar-signaling metabolite trehalose-6-phosphate was elevated in leaf, cob, and kernels at silking as a consequence of salt treatment but decreased thereafter even as Suc levels continued to rise. Interestingly, the transcripts of trehalose pathway genes were most affected by salt treatment in leaf tissue. On the other hand, transcripts of the SUCROSE NONFERMENTING-RELATED KINASE1 (SnRK1) marker genes were most affected in reproductive tissue. Overall, both source and sink strength are reduced by salt, and the data indicate that trehalose-6-phosphate and SnRK1 may have different roles in source and sink tissues. Kernel abortion resulting from osmotic stress is not from a lack of carbohydrate reserves but from the inability to utilize these energy reserves.

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Section: Salt Stress Inhibits Photosynthesis Respiration and Growthsupporting

confidence: 91%

Differential Role for Trehalose Metabolism in Salt-Stressed Maize

et al. 2015

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“…Chlorophyll is the basic pigment for photosynthesis in plants, and its changes directly affect the photosynthesis of plants 25 . Salt stress increased chlorophyllase activity and promoted chlorophyll degradation, which caused chlorophyll content to decrease 26 . However, some studies have shown that salt stress can increase chlorophyll content significantly, it is considered that the binding between chlorophyll and chloroplast proteins in leaves is relaxed under salt stress, which makes chlorophyll easy to extract 27 .…”

Section: Discussionmentioning

confidence: 99%

“…Leaf gas exchange parameters were measured following Khaled et al . 26 , setting the endogenous light intensity is 600μmol·m −2 ·S −1 , the concentration of CO 2 is 360 μL·L −1 , the temperature is 25 °C.…”

Section: Methodsmentioning

confidence: 99%

Chrysanthemum WRKY gene DgWRKY5 enhances tolerance to salt stress in transgenic chrysanthemum

Liang

Wang

et al. 2017

Sci Rep

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WRKY transcription factors play important roles in plant growth development, resistance and substance metabolism regulation. However, the exact function of the response to salt stress in plants with specific WRKY transcription factors remains unclear. In this research, we isolated a new WRKY transcription factor DgWRKY5 from chrysanthemum. DgWRKY5 contains two WRKY domains of WKKYGQK and two C2H2 zinc fingers. The expression of DgWRKY5 in chrysanthemum was up-regulated under various treatments. Meanwhile, we observed higher expression levels in the leaves contrasted with other tissues. Under salt stress, the activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) enzymes in transgenic chrysanthemum were significantly higher than those in WT, whereas the accumulation of H2O2, O2 − and malondialdehyde (MDA) was reduced in transgenic chrysanthemum. Several parameters including root length, root length, fresh weight, chlorophyll content and leaf gas exchange parameters in transgenic chrysanthemum were much better compared with WT under salt stress. Moreover, the expression of stress-related genes DgAPX, DgCAT, DgNCED3A, DgNCED3B, DgCuZnSOD, DgP5CS, DgCSD1 and DgCSD2 was up-regulated in DgWRKY5 transgenic chrysanthemum compared with that in WT. These results suggested that DgWRKY5 could function as a positive regulator of salt stress in chrysanthemum.

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“…Blade gas exchange parameter was measured at nine o'clock in the morning and the endogenous light intensity was 800μmol quanta m −2 s −1 [27].…”

Section: Determination Of Morphological Characteristics and Physiologmentioning

confidence: 99%

Transcriptomic analysis of Verbena bonariensis roots in response to cadmium stress

Wang

Bai

Xiao

et al. 2019

Preprint

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Background: Cadmium (Cd) is a serious heavy metal (HM) soil pollutant. To alleviate or even eliminate HM pollution in soil, environmental-friendly methods are applied. One is that special plants are cultivated to absorb the HM in the contaminated soil. As an excellent economical plant with ornamental value and sound adaptability, V.bonariensis could be adapted to this very situation. In our study, the Cd tolerance in V.bonariensis was analyzed as well as overall analysis of transcriptome. Results: In this study, the tolerance of V.bonariensis to Cd stress was investigated in four aspects: germination, development, pysiological changes, and molecular alterations. The results showed that as a non-hyperaccumulator, V. bonariensis did possess the Cd tolerance and the capability to concentration Cd. Under Cd stress, all 237,866 transcripts and 191,370 unigenes were constructed in the transcriptome data of V.bonariensis roots . The enrichment analysis of gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway revealed that differentially expressed genes (DEGs) under Cd stress were predominately related to cell structure, reactive oxygen species (ROS) scavenging system, chelating reaction and secondary metabolites, transpiration and photosynthesis. DEGs encoding lignin synthesis, chalcone synthase (CHS) and anthocyanidin synthase (ANS) were prominent in V. bonariensis under Cd stress. The expression patterns of 10 DEGs, validated by quantitative real-time polymerase chain reaction (qRT-PCR), were in highly accordance with the RNA-Sequence (RNA-Seq) results. The novel strategies brought by our study was not only benefit for further studies on the tolerance of Cd and functional genomics in V. bonariensis , but also for the improvement molecular breeding and phytoremediation.

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Responses of leaf growth and gas exchanges to salt stress during reproductive stage in wild wheat relative Aegilops geniculata Roth. and wheat (Triticum durum Desf.)

Cited by 16 publications

References 31 publications

Differential Role for Trehalose Metabolism in Salt-Stressed Maize

Differential Role for Trehalose Metabolism in Salt-Stressed Maize

Chrysanthemum WRKY gene DgWRKY5 enhances tolerance to salt stress in transgenic chrysanthemum

Transcriptomic analysis of Verbena bonariensis roots in response to cadmium stress

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