Genetika 2016 Volume 48, Issue 2, Pages: 445-462
https://doi.org/10.2298/GENSR1602445K
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Analysis of secondary metabolism and total chlorophyll content provides new insights into the role of A-tocopherol for wild type and VTE4 mutant Arabidopsis thaliana under different abiotic stresses
Khalatbari Amir Ali (Universiti Putra Malaysia, Faculty of Agriculture, Department of Crop Science, Serdang, Selangor, Malaysia)
Jaafar Hawa Z.E. (Universiti Putra Malaysia, Faculty of Agriculture, Department of Crop Science, Serdang, Selangor, Malaysia)
Khalatbari Amir Mahdi (Universiti Putra Malaysia, Faculty of Agriculture, Department of Crop Science, Serdang, Selangor, Malaysia)
Mahmood Maziah (Universiti Putra Malaysia, Faculty of Biotechnology and Biomolecular sciences, Department of Biochemistry, Serdang, Selangor, Malaysia)
Othman Radziah (Universiti Putra Malaysia, Faculty of Agriculture, Department of Land Management, Serdang, Selangor, Malaysia)
Plants experience different abiotic stresses under natural conditions
including salinity, water deficit, low temperature and high light. Once
plants are exposed to these stresses they might have a variety of responses
physiologically and biochemically. In this study, we test this hypothesis in
wild type Col-0 and vte4 mutant of Arabidopsis thaliana by measuring major
secondary metabolites alongside with total chlorophyll content under
different abiotic stresses namely salt stress, water stress and prolonged
water deficiency. These stresses were imposed to the plants in separate
experiments in which each treatment was replicated three times in a complete
randomized design with factorial arrangement. It was concluded that under all
abiotic stresses wild type Col-0 Arabidopsis plants showed stronger
performance in terms of all major metabolites compared to vte4 mutant.
α-tocopherol deficiency in vte4 mutant plants led to lower accumulation of
proline, total protein and total amino acids as well as starch and total
sugars in comparison with wild type A. thaliana. Furthermore, all five
secondary metabolites obtained the highest value under 100mM NaCl
concentration (Salt stress), under 50% of field capacity (water stress) and
under 8 days of water withholding (prolonged water deficiency). Wild type
Col-0 resulted in higher level of total chlorophyll content under all abiotic
stresses compared to mutant plants. Therefore, our results suggested that the
loss of α-tocopherol in vte4 mutant A.thaliana under different abiotic
stresses affected the efficiency and the stability of central metabolism and
photosynthetic apparatus.
Keywords: Arabidopsis thaliana, abiotic stresses, mutantm secondary metabolites, Wild type