title: Regulation of auxin, abscisic acid and salicylic acid levels by ascorbate application under heat stress in sensitive and tolerant maize leaves.
abstract: In the present study, the effect of ascorbic acid (5 mM) on some physiological parameters and three hormones (auxin, abscisic acid, salicylic acid) was determined under heat stress (40 °C) in maize tolerant cv. (MAY 69) and sensitive cv. SHEMAL (SH) at 0 h, 4 h and 8 h. Heat stress reduced total chlorophyll content (CHL), relative water content (RWC) and stomatal conductance (gs) in SH but did not lead to changes in MAY 69 at 4 h and 8 h. However, pretreatment with ascorbic acid increased (CHL), (RWC) and (gs) in SH under heat stress while it reduced MDA content significantly in both cv. We also observed that heat stress led to a reduction in SA level but increased ABA and IAA levels in SH, whereas it increased SA and IAA levels but did not change ABA level in MAY 69 at 4 h. Furthermore, in SH, ASC application under heat stress increased SA level and decreased IAA and ABA levels at 4 h, but it had no effect on SA and ABA at 8 h.
authors.affiliation: Sinop University Faculty of Arts and Sciences, Biology Sinop Turkey.
authors.forename: Burcu Seckin
authors.initials: BS
authors.lastname: Dinler
authors.affiliation: The Black Sea Agriculture Resources Institute Samsun Turkey.
authors.forename: Emel
authors.initials: E
authors.lastname: Demir
authors.affiliation: 19 Mayis University Faculty of Arts and Sciences, Biology Samsun Turkey.
authors.forename: Yasemin Ozdener
authors.initials: YO
authors.lastname: Kompe
mesh_terms: D000040:Abscisic Acid / Q000378:metabolism*; D001205:Ascorbic Acid / Q000494:pharmacology*; D002734:Chlorophyll / Q000378:metabolism; D018869:Heat-Shock Response; D006358:Hot Temperature; D007210:Indoleacetic Acids / Q000378:metabolism*; D008315:Malondialdehyde / Q000378:metabolism; D054046:Plant Stomata / Q000187:drug effects / Q000378:metabolism; D020156:Salicylic Acid / Q000378:metabolism*; D013997:Time Factors; D014867:Water / Q000378:metabolism; D003313:Zea mays / Q000187:drug effects* / Q000378:metabolism
chemical_list: D007210:Indoleacetic Acids; D014867:Water; D002734:Chlorophyll; D008315:Malondialdehyde; D000040:Abscisic Acid; D020156:Salicylic Acid; D001205:Ascorbic Acid
keywords: Ascorbate; heat stress; hormones; maize