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Malondialdehyde content as a potential biochemical indicator of tolerant Cenchrus ciliaris L. genotypes under heat stress treatment

Abstract
Buffel grass (Cenchrus ciliaris L.) is an important forage grass in arid and semiarid regions. As part of a genetic improvement programme, four genotypes [Biloela (Bl), Americana (Am), Texas (Tx) and Sexual (Sx)] were categorized by tolerance to heat stress in a greenhouse experiment. At 30 d after sowing, half of the plants (control plants) were transferred to growth chambers (28°C day per night), and the other half (pre‐treated plants, Prt) were exposed [ver mas...]
Buffel grass (Cenchrus ciliaris L.) is an important forage grass in arid and semiarid regions. As part of a genetic improvement programme, four genotypes [Biloela (Bl), Americana (Am), Texas (Tx) and Sexual (Sx)] were categorized by tolerance to heat stress in a greenhouse experiment. At 30 d after sowing, half of the plants (control plants) were transferred to growth chambers (28°C day per night), and the other half (pre‐treated plants, Prt) were exposed to heat stress treatment (0, 24, 48 and 72 h; 45°C day per night). Malondialdehyde (MDA) content, an indicator of oxidative damage, was determined from foliar samples. During heat stress, Sx showed the earliest increase in MDA (at 24 h) followed by Tx (48 h) and Am and Bl (72 h). Results were compared with heat‐stress tolerance evaluated as morphological traits at the end of recuperation (60 d after sowing). Fresh weight and aerial plant height were lowest in the Prt‐Sx genotype and highest in Am and Bl genotypes; Tx showed intermediate tolerance. Results suggest that tolerance to heat stress in C. ciliaris genotypes could be related to the capacity for regulating the oxidative damage increase. Foliar MDA content might therefore be used in a genetic improvement programme of C. ciliaris as a potential biochemical indicator for a rapid, simple and low‐cost identification of heat‐stress tolerant genotypes. [Cerrar]
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Author
Tommasino, Exequiel Arturo;   Griffa, Sabrina Mariana;   Grunberg, Karina;   Ribotta, Andrea Noemi;   Lopez Colomba, Eliana;   Carloni, Edgardo José;   Quiroga, Mariana Paola;   Luna, Celina Mercedes;  
Fuente
Grass and Forage Science 67 (3) : 456-459 (September 2012)
Date
2012-09
Editorial
Wiley
ISSN
0142-5242
1365-2494
URI
https://onlinelibrary.wiley.com/doi/10.1111/j.1365-2494.2012.00851.x
http://hdl.handle.net/20.500.12123/4639
DOI
https://doi.org/10.1111/j.1365-2494.2012.00851.x
Formato
pdf
Tipo de documento
artículo
Palabras Claves
Cenchrus Ciliaris; Genotipos; Genotypes; Malondialdehído; Malondialdehyde; Estrés Oxidativo; Oxidative Stress; Tolerancia al Calor; Heat Tolerance; Pasto buffel; Buffel Grass; Indicadores bioquímicos;
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