title: Tolerance to high soil temperature in foxtail millet (Setaria italica L.) is related to shoot and root growth and metabolism.
abstract: Roots play important roles in regulating whole-plant carbon and water relations in response to extreme soil temperature. Three foxtail millet (Setaria italica L.) lines (448-Ames 21521, 463-P1391643 and 523-P1219619) were subjected to two different soil temperatures (28 and 38 °C). The gas exchange, chlorophyll fluorescence, root morphology and central metabolism of leaves and roots were studied at the grain-filling stage. High soil temperature (38 °C) significantly influenced the shoot transpiration, stomatal conductance, photosynthesis, root growth and metabolism of all lines. The root length and area were significantly reduced in lines 448 and 463 in response to the stress, while only a small non-specific reduction was observed in line 523 in response to the treatment. The shift of root metabolites in response to high soil temperature was also genotype specific. In response to high soil temperature, glutamate, proline and pyroglutamate were reduced in line 448, and alanine, aspartate, glycine, pyroglutamate, serine, threonine and valine were accumulated in line 463. In the roots of line 523, serine, threonine, valine, isomaltose, maltose, raffinose, malate and itaconate were accumulated. Root tolerance to high soil temperature was evident in line 523, in its roots growth potential, lower photosynthesis and stomatal conductance rates, and effective utilization and assimilation of membrane carbon and nitrogen, coupled with the accumulation of protective metabolites.
authors.affiliation: The French Associates Institute for Agriculture and Biotechnology of Drylands, The Jacob Blaustein Institutes for Desert Research, French Associates Institute for Agriculture and Biotechnology of Drylands Ben-Gurion University of the Negev, Sede Boqer, Israel.
authors.forename: Moses Kwame
authors.initials: MK
authors.lastname: Aidoo
authors.affiliation: Evogene Ltd, Rehovot, Israel.
authors.forename: Eyal
authors.initials: E
authors.lastname: Bdolach
authors.affiliation: The French Associates Institute for Agriculture and Biotechnology of Drylands, The Jacob Blaustein Institutes for Desert Research, French Associates Institute for Agriculture and Biotechnology of Drylands Ben-Gurion University of the Negev, Sede Boqer, Israel.
authors.forename: Aaron
authors.initials: A
authors.lastname: Fait
authors.affiliation: The French Associates Institute for Agriculture and Biotechnology of Drylands, The Jacob Blaustein Institutes for Desert Research, French Associates Institute for Agriculture and Biotechnology of Drylands Ben-Gurion University of the Negev, Sede Boqer, Israel.
authors.forename: Naftali
authors.initials: N
authors.lastname: Lazarovitch
authors.affiliation: The French Associates Institute for Agriculture and Biotechnology of Drylands, The Jacob Blaustein Institutes for Desert Research, French Associates Institute for Agriculture and Biotechnology of Drylands Ben-Gurion University of the Negev, Sede Boqer, Israel. Electronic address: rshimon@bgu.ac.il.
authors.forename: Shimon
authors.initials: S
authors.lastname: Rachmilevitch
mesh_terms: D000222:Adaptation, Physiological / Q000187:drug effects; D000596:Amino Acids / Q000378:metabolism; D002244:Carbon / Q000494:pharmacology; D019069:Cell Respiration / Q000187:drug effects; D002734:Chlorophyll / Q000378:metabolism; D003624:Darkness; D005453:Fluorescence; D006358:Hot Temperature; D055442:Metabolome / Q000187:drug effects; D009584:Nitrogen / Q000494:pharmacology; D010788:Photosynthesis / Q000187:drug effects; D018515:Plant Leaves / Q000187:drug effects / Q000378:metabolism; D018517:Plant Roots / Q000033:anatomy & histology / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D018520:Plant Shoots / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D025341:Principal Component Analysis; D032983:Setaria Plant / Q000187:drug effects / Q000254:growth & development* / Q000378:metabolism*; D012987:Soil; D013312:Stress, Physiological / Q000187:drug effects
chemical_list: D000596:Amino Acids; D012987:Soil; D002734:Chlorophyll; D002244:Carbon; D009584:Nitrogen
keywords: Carbon and nitrogen; Gas exchange; Root dynamics; Stress-related metabolites; Tolerance