| 个人简介 | |
|---|---|
 Dr. Saddam Hussain Department of Agronomy, University of Agriculture, Pakistan |
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| 标题： Rice seed priming modulated the leaf oxidative status and antioxidant responses under limited moisture and nutrient supply | |
| 摘要： With increasing frequency and episodes of extreme climatic events, the crop plants are sometimes exposed to multiple abiotic stress factors at the same growth stage. In the present study, we investigated the behavior of growth, reactive oxygen species and antioxidant defense system in primed (60 μM selenium or 100 mg L-1 salicylic acid priming) and non-primed rice seedlings to the combinations of drought stress and N-, P- or K-deprivation. Results indicated that drought stress as well as deprivation of any mineral nutrient severely hampered the seedling growth of rice. The N-deprivation alone or in combination with drought stress caused the maximum reduction in shoot length and biomass accumulation, although the N-deprived roots were longer. The beneficial effects of seed priming on shoot and root growth of rice were well indicated under drought stress and different nutrient management regimes. Drought as well as nutrient deprivation caused pronounced changes in the oxidative metabolism of rice leaves. The marked increase in the accumulation of ROS (O2•−, OH--, H2O2 ) and activities of ROS-producing enzymes under the individual as well as interactive effect of drought and N-, P-, or K-deprivation, led to higher lipid peroxidation. The interaction of drought stress and N-deprivation caused the maximum oxidative damage, and recorded poor antioxidant activity, suggesting that N-supply is more crucial under drought stress. The N-deprivation also significantly decreased the levels of non-enzymatic antioxidants (GSH, Vc, Ve), which are crucial for the drought tolerance of plants. The oxidative stress evoked by drought or/and nutrient deprivation, was effectively alleviated after seed priming. The leaves of rice seedlings emerged from primed seeds, recorded significantly lower accumulation of ROS and MDA, and lower activities of MAO and XOD. These attributes were well linked to priming-induced enhancements in the activities/levels of SOD, POD, GR, GPX, GSH and Vc in the rice leaves. | |
| 简介： Dr. Saddam Hussain is working as Assistant Professor in the area of Plant Stress Physiology at the Department of Agronomy, University of Agriculture, Faisalabad. He has been recognized with several international distinctions/awards in recent years. He completed his Ph.D. degree from Huazhong Agricultural University, China. Dr. Hussain has authored more than 100 research articles in the well-reputed International SCI journals mainly including Scientific Reports, Agronomy for Sustainable Development, Chemosphere, Ecotoxicology and Environmental Safety, Plant Physiology and Biochemistry, Frontiers in Plant Science and Molecular Plant, and has also contributed in several books. He is also working in the editorial board of various international journals. Dr. Hussain is working on different projects regarding abiotic stress tolerance in crop plants and enhancing crop resilience to changing climate. He is also focusing on the development and promotion of seed invigoration approaches. His teaching activities include advising and mentoring graduate students and teaching of undergraduate and post-graduate courses related to plant physiology and agronomy. | |
