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Physiological and transcriptomic characterization of submergence and reoxygenation responses in soybean seedlings.
Tamang, Bishal G; Magliozzi, Joseph O; Maroof, M A Saghai; Fukao, Takeshi.
Afiliación
  • Tamang BG; Department of Crop and Soil Environmental Sciences, Virginia Tech, Blacksburg, VA, 24061, USA.
Plant Cell Environ ; 37(10): 2350-65, 2014 Oct.
Article en En | MEDLINE | ID: mdl-24433575
Complete inundation at the early seedling stage is a common environmental constraint for soybean production throughout the world. As floodwaters subside, submerged seedlings are subsequently exposed to reoxygenation stress in the natural progression of a flood event. Here, we characterized the fundamental acclimation responses to submergence and reoxygenation in soybean at the seedling establishment stage. Approximately 90% of seedlings succumbed during 3 d of inundation under constant darkness, whereas 10 d of submergence were lethal to over 90% of seedlings under 12 h light/12 h dark cycles, indicating the significance of underwater photosynthesis in seedling survival. Submergence rapidly decreased the abundance of carbohydrate reserves and ATP in aerial tissue of seedlings although chlorophyll breakdown was not observed. The carbohydrate and ATP contents were recovered upon de-submergence, but sudden exposure to oxygen also induced lipid peroxidation, confirming that reoxygenation induced oxidative stress. Whole transcriptome analysis recognized genome-scale reconfiguration of gene expression that regulates various signalling and metabolic pathways under submergence and reoxygenation. Comparative analysis of differentially regulated genes in shoots and roots of soybean and other plants defines conserved, organ-specific and species-specific adjustments which enhance adaptability to submergence and reoxygenation through different metabolic pathways.
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Texto completo: 1 Banco de datos: MEDLINE Asunto principal: Oxígeno / Glycine max / Adaptación Fisiológica / Agua / Regulación de la Expresión Génica de las Plantas / Transcriptoma Idioma: En Revista: Plant Cell Environ Asunto de la revista: BOTANICA Año: 2014 Tipo del documento: Article País de afiliación: Estados Unidos

Texto completo: 1 Banco de datos: MEDLINE Asunto principal: Oxígeno / Glycine max / Adaptación Fisiológica / Agua / Regulación de la Expresión Génica de las Plantas / Transcriptoma Idioma: En Revista: Plant Cell Environ Asunto de la revista: BOTANICA Año: 2014 Tipo del documento: Article País de afiliación: Estados Unidos