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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Babayev, Hasan Mehvaliyeva, Ulduza Aliyeva, Minakhanym Feyziyev, Yashar Guliyev, Novruz |
| Description | Country affiliation: Azerbaijan Author Affiliation: Babayev H ( Institute of Botany, National Academy of Sciences, 40 Patamdar Highway, AZ 1073 Baku, Azerbaijan.); Mehvaliyeva U ( Institute of Botany, National Academy of Sciences, 40 Patamdar Highway, AZ 1073 Baku, Azerbaijan.); Aliyeva M ( Institute of Botany, National Academy of Sciences, 40 Patamdar Highway, AZ 1073 Baku, Azerbaijan.); Feyziyev Y ( Institute of Botany, National Academy of Sciences, 40 Patamdar Highway, AZ 1073 Baku, Azerbaijan. Electronic address: feyziyev-y@botany-az.org.); Guliyev N ( Institute of Botany, National Academy of Sciences, 40 Patamdar Highway, AZ 1073 Baku, Azerbaijan.) |
| Abstract | Decarboxylating NAD-malate dehydrogenase (NAD-malic enzyme, NAD-ME, EC 1.1.1.39) has been investigated under a long-term drought during pre-anthesis, anthesis and seed-formation phases of ontogenesis of a NAD-ME type C4 plant Amaranthus cruentus L. using cytosol, chloroplast and mitochondrial fractions of mesophyll (M) and bundle sheath (BS) cells. We detected several molecular forms of NAD-ME with different subcellular localization patterns in the studied phases of amaranth ontogenesis. However, no enzyme activity was observed experimentally in chloroplasts of M and BS cells. In the pre-anthesis phase NAD-ME isoform with molecular weight of â¼115 kDa was found in cytosol of M and BS cells of control and drought-exposed plants. One of NAD-ME isoforms with molecular weight of 110 kDa was located in mitochondria of BS cells of control and drought-exposed plants, and a new isoform of â¼121 kDa was formed in mitochondria of BS cells under the influence of drought. After resuming watering this isoform (â¼121 kDa) disappeared again. Approximately 90.6% and 9.4% of the total NAD-ME activity were localized in mitochondrial stroma and cytosol of BS cells, respectively, while in mesophyll cells 100% activity was found in cytosol fractions. The reaction catalyzed by NAD-ME follows Michaelis-Menten equation. NAD(+), l-malate and Mn(2+) activate this enzyme in mitochondria. Appearance of the â¼121 kDa isoform of NAD-ME in the mitochondrial fraction of BS cells under drought and its disappearance after resuming watering could be attributed to one of the protection functions of plants. |
| File Format | HTM / HTML |
| ISSN | 09819428 |
| Volume Number | 81 |
| e-ISSN | 18732690 |
| Journal | Plant Physiology and Biochemistry |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2014-08-01 |
| Publisher Place | France |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Botany Discipline Biochemistry Amaranthus Enzymology Malate Dehydrogenase Metabolism Photosynthesis Genetics Physiology Chloroplasts Droughts Enzyme Activation Isoenzymes Kinetics Mesophyll Cells Mitochondria Plant Leaves Plant Vascular Bundle Protein Transport Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Genetics Physiology Plant Science |
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