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Tocopherol deficiency reduces sucrose export from salt-stressed potato leaves independently of oxidative stress and symplastic obstruction by callose.

Asensi-Fabado MA, Ammon A, Sonnewald U, Munné-Bosch S, Voll LM - J. Exp. Bot. (2014)

Bottom Line: Based on comprehensive gene expression analyses, we propose that enhanced responsiveness of SnRK1 target genes in mesophyll cells and altered redox regulation of phloem loading by SUT1 contribute to the attenuation of sucrose export from salt-stressed SXD:RNAi source leaves.In leaves of the SXD1:RNAi plants, sodium accumulation was diminished, while proline accumulation and pools of soluble antioxidants were increased.As supported by phytohormone contents, these differences seem to increase longevity and prevent senescence of SXD:RNAi leaves under salt stress.

View Article: PubMed Central - PubMed

Affiliation: University of Barcelona, Faculty of Biology, Department of Plant Biology, Diagonal Avenue 643, E-08028 Barcelona, Spain.

No MeSH data available.


Related in: MedlinePlus

Phytohormone contents in source leaves of tocopherol-deficient potato plants exposed to 19 days’ salt treatment. Leaf content of ABA, ACC, SA, and of the cytokinins IPA and ZR are shown from top to bottom. Left panels represent middle leaves (leaf 8); right panels represent bottom leaves (leaf 11). Black bars, salt-stress treatment; white bars, control treatment. Data represent the mean ± SE of four individual plants. Data were analysed by t-test; significant differences between the transgenic lines and the wild type within a treatment are indicated by a black asterisk (control treatment) or a white asterisk (stress treatment), while diamonds indicate significant differences between control and salt stress within a genotype (P < 0.05).
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Figure 10: Phytohormone contents in source leaves of tocopherol-deficient potato plants exposed to 19 days’ salt treatment. Leaf content of ABA, ACC, SA, and of the cytokinins IPA and ZR are shown from top to bottom. Left panels represent middle leaves (leaf 8); right panels represent bottom leaves (leaf 11). Black bars, salt-stress treatment; white bars, control treatment. Data represent the mean ± SE of four individual plants. Data were analysed by t-test; significant differences between the transgenic lines and the wild type within a treatment are indicated by a black asterisk (control treatment) or a white asterisk (stress treatment), while diamonds indicate significant differences between control and salt stress within a genotype (P < 0.05).


Tocopherol deficiency reduces sucrose export from salt-stressed potato leaves independently of oxidative stress and symplastic obstruction by callose.

Asensi-Fabado MA, Ammon A, Sonnewald U, Munné-Bosch S, Voll LM - J. Exp. Bot. (2014)

Phytohormone contents in source leaves of tocopherol-deficient potato plants exposed to 19 days’ salt treatment. Leaf content of ABA, ACC, SA, and of the cytokinins IPA and ZR are shown from top to bottom. Left panels represent middle leaves (leaf 8); right panels represent bottom leaves (leaf 11). Black bars, salt-stress treatment; white bars, control treatment. Data represent the mean ± SE of four individual plants. Data were analysed by t-test; significant differences between the transgenic lines and the wild type within a treatment are indicated by a black asterisk (control treatment) or a white asterisk (stress treatment), while diamonds indicate significant differences between control and salt stress within a genotype (P < 0.05).
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4321552&req=5

Figure 10: Phytohormone contents in source leaves of tocopherol-deficient potato plants exposed to 19 days’ salt treatment. Leaf content of ABA, ACC, SA, and of the cytokinins IPA and ZR are shown from top to bottom. Left panels represent middle leaves (leaf 8); right panels represent bottom leaves (leaf 11). Black bars, salt-stress treatment; white bars, control treatment. Data represent the mean ± SE of four individual plants. Data were analysed by t-test; significant differences between the transgenic lines and the wild type within a treatment are indicated by a black asterisk (control treatment) or a white asterisk (stress treatment), while diamonds indicate significant differences between control and salt stress within a genotype (P < 0.05).
Bottom Line: Based on comprehensive gene expression analyses, we propose that enhanced responsiveness of SnRK1 target genes in mesophyll cells and altered redox regulation of phloem loading by SUT1 contribute to the attenuation of sucrose export from salt-stressed SXD:RNAi source leaves.In leaves of the SXD1:RNAi plants, sodium accumulation was diminished, while proline accumulation and pools of soluble antioxidants were increased.As supported by phytohormone contents, these differences seem to increase longevity and prevent senescence of SXD:RNAi leaves under salt stress.

View Article: PubMed Central - PubMed

Affiliation: University of Barcelona, Faculty of Biology, Department of Plant Biology, Diagonal Avenue 643, E-08028 Barcelona, Spain.

No MeSH data available.


Related in: MedlinePlus