Kholova, J and Hash, C T and Kočová, M and Vadez, V (2011) Does a terminal drought tolerance QTL contribute to differences in ROS scavenging enzymes and photosynthetic pigments in pearl millet exposed to drought? Environmental and Experimental Botany, 71 (1). pp. 99-106.
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Abstract
The control of reactive oxygen species (ROS) and the stability of photosynthetic pigments under stress conditions are hypothesized to contribute to drought tolerance. Here we studied how ascorbic peroxidase (APX), superoxide dismutase (SOD), catalase (CAT) isozyme activities and chlorophyll a, b (Chl a, b) and carotenoids (Car) contents responded to water stress and whether they related to presence of a terminal drought tolerance QTL in pearl millet. We used PRLT2/89-33 (QTL donor), H77/833-2 (sensitive), and near-isogenic lines (QTL-NILs) introgressed with the QTL in H77/833-2 background. Under water stress there was no significant change in the total APX activity; only the proportional APX5 activity increased, with higher band intensity in tolerant genotypes. There were no significant changes in total activities of CAT and SOD under water stress, with similar band intensities in all genotypes, and a new CAT isozyme was induced in all genotypes. The photosynthetic pigment content decreased under water stress, although not differently in any genotype. Under water stress, the activities of most APX, CAT and SOD isozymes were closely related to the total chlorophyll/carotenoids ratio. Overall, besides APX5, water stress did not lead to major changes in the profile of isoenzymes involved in ROS scavenging. Similarly, the pigment content under stress did not discriminate genotypes according to the presence/absence of the QTL. This absence of discrimination for the ROS scavenging enzymes and for the pigment content under stress suggests that these traits may not play a key role in terminal drought tolerance in pearl millet.
| Item Type: | Article |
|---|---|
| Divisions: | UNSPECIFIED |
| CRP: | UNSPECIFIED |
| Uncontrolled Keywords: | Pearl millet; Drought; Anti-oxidant enzymes; Photosynthetic pigments |
| Agro Tags: | <b>Agrotags</b> - planting | drought | enzymes | genotypes | irrigation | pigments | tolerance | chlorophylls | millets | pearl millet (plant) <br><b>Fishtags</b> - pearls <br><b>Geopoliticaltags</b> - czech republic | india | maine | andhra pradesh |
| Subjects: | Mandate crops > Millets |
| Depositing User: | Siva Shankar |
| Date Deposited: | 26 May 2011 04:40 |
| Last Modified: | 04 Sep 2017 08:40 |
| URI: | http://oar.icrisat.org/id/eprint/35 |
| Official URL: | http://dx.doi.org/10.1016/j.envexpbot.2010.11.001 |
| Projects: | UNSPECIFIED |
| Funders: | UNSPECIFIED |
| Acknowledgement: | Senior Author was supported for the development of the manuscript by a grant from DFID-BBSRC, Research Contract BB/F004133/1 and grant No. MSM0021620858 from the Ministry of Education, Youth and Sports of the Czech Republic |
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