Web URL(s): http://www.sciencedirect.com/science/article/pii/S0304423808004378 Publication Type:
i
Refereed Author(s): Bian, Shaomin ;
Jiang, Yiwei Author Affiliation: Department of Agronomy, Purdue University, West Lafayette, Indiana Title: Reactive oxygen species, antioxidant enzyme activities and gene expression patterns in leaves and roots of Kentucky bluegrass in response to drought stress and recovery Source: Scientia Horticulturae . Vol. 120, No. 2, April 2 2009, p. 264-270.# of Pages: 7 Publishing Information: Amsterdam, Elsevier Keywords: TIC Keywords: Antioxidants ; Cultivar evaluation ; Drought recovery ; Drought stress ; Enzyme activity ; Gene expression ; Poa pratensis ; Reactive oxygen species Cultivar Names: Midnight II Abstract/Contents: "The objective of this study was to investigate accumulation of reactive oxygen species, antioxidant enzyme activities, and gene expression patterns of antioxidant enzymes of Kentucky bluegrass (Poa pratensis L.) under drought stress and recovery. Grass (c.v. Midnight II) was subjected to soil drying for 5 d and then rewatered for 1 d in growth chambers. Drought stress increased superoxide (O2 - ) production of leaves and hydrogen peroxide (H2 O2 ) content of the leaves and roots. Recovery enhanced leaf O2 - production and root H2 O2 content. Lipid peroxidation of the roots increased 4.5-fold and 2.4-fold under drought stress and recovery, respectively. Drought stress increased the leaf activities of ascorbate peroxidase (APX, EC 1.11.1.11), monodehydroascorbate reductase (MDHAR, EC 1.6.5.4), dehydroascorbate reductase (DHAR, EC 1.8.5.1), and the root activities of catalase (CAT, EC 1.11.1.6), glutathione reductase (GR, EC 1.6.4.2) and MDHAR, while reducing the root activities of superoxide dismutase (SOD, EC 1.15.1.1) and DHAR, respectively. The increased leaf activities of APX, MDHAR, DHAR and the root activities of MDHAR and CAT were observed after rewatering, compared to the control. For the leaves, the expressions of iron SOD (FeSOD ), cytosolic copper/zinc SOD (Cu/ZnSOD ), chloroplastic Cu/ZnSOD , and DHAR were down-regulated by drought stress but recovered to control level after rewatering, while the expressions of GR and MDHAR were up-regulated and remained that levels after recovery. For the roots, the expressions of cytosolic Cu/ZnSOD , manganese SOD (MnSOD ), cytosolic APX , GR , and DHAR were down-regulated under drought stress but recovered except for GR and DHAR , while MDHAR expression was up-regulated. No differences in CAT transcript abundance were noted among the treatments. Antioxidant enzymes and their gene expressions may be differentially or cooperatively involved in the defense mechanisms in the leaves and roots of Kentucky bluegrass exposed to drought stress and recovery." Language: English References: 36 Note: Tables See Also: Other items relating to: Disasters - Drought ASA/CSSA/SSSA Citation (Crop Science -Like - may be incomplete ): Scientia Horticulturae .Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=147030 If there are problems with this record, send us feedback about record 147030 . Choices for finding the above item : Web URL(s): http://www.sciencedirect.com/science/article/pii/S0304423808004378 b4895016~S1a Find from within TIC: Request through your local library's inter-library loan service (bring or send a copy of this TGIF record)
