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Physiological and Biochemical Dissection Reveals a Trade-Off between Antioxidant Capacity and Heat Tolerance in Bread Wheat (Triticum aestivum L.).
- Source :
- Antioxidants; Mar2021, Vol. 10 Issue 3, p351, 1p
- Publication Year :
- 2021
-
Abstract
- Heat stress alters photosynthetic components and the antioxidant scavenging system, negatively affecting plant growth and development. Plants overcome heat stress damage through an integrated network involving enzymatic and non-enzymatic antioxidants. This study aimed to assess physiological and biochemical responses in contrasting thermo-tolerant wheat varieties exposed to 25 °C (control) and 35 °C (heat stress), during the seedling stage. Our results revealed a substantial decrease in the photosynthetic pigments, carotenoids, anthocyanin content, and increased membrane injury index, malondialdehyde, methylglyoxal (MG), H<subscript>2</subscript>O<subscript>2</subscript> contents and lipoxygenase activity compared to non-stress wheat seedlings. The heat-tolerant variety BARI Gom 26 ("BG26") maintained higher cellular homeostasis compared to the heat susceptible variety Pavon 76 ("Pavon"), perpetuated by higher accumulation of proline, glycine betaine, ascorbate-glutathione cycle associated enzymes, reduced glutathione and ascorbate concentration in plant cells. Significantly lower levels of MG detoxification and antioxidant activities and ascorbate-glutathione cycle-related enzymatic activities lead to increased susceptibility in variety "Pavon". Hierarchical clustering and principal component analysis revealed that variety "BG26" possess a combination of biochemical responses tailoring antioxidant activities that induced a higher level of tolerance. Taken together, our results provide a pipeline for establishing a trade-off between antioxidant capacity and heat tolerance to facilitate functional genomics and translational research to unravel underlying mechanisms to better adapt wheat to heat stress. [ABSTRACT FROM AUTHOR]
- Subjects :
- WHEAT
OXIDANT status
HEAT capacity
BETAINE
FUNCTIONAL genomics
GLUTATHIONE
Subjects
Details
- Language :
- English
- ISSN :
- 20763921
- Volume :
- 10
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Antioxidants
- Publication Type :
- Academic Journal
- Accession number :
- 149575115
- Full Text :
- https://doi.org/10.3390/antiox10030351