Journal
PLANT PHYSIOLOGY AND BIOCHEMISTRY
Volume 73, Issue -, Pages 326-336Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2013.10.012
Keywords
Cold; Oxidative stress; Photochemical activity; Photosynthesis; Saccharum spp.; Water deficit
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Funding
- Sao Paulo Research Foundation (FAPESP, Brazil), through the Bioen Program [Proc. 2008/57495-3]
- National Council for Scientific and Technological Development (CNPq, Brazil)
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [08/57495-3] Funding Source: FAPESP
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The physiological responses of C-4 species to simultaneous water deficit and low substrate temperature are poorly understood, as well as the recovery capacity. This study investigated whether the effect of these abiotic stressors is cultivar-dependent. The differential responses of drought-resistant (IACSP94-2094) and drought-sensitive (IACSP97-7065) sugarcane cultivars were characterized to assess the relationship between photosynthesis and antioxidant protection by APX and SOD isoforms under stress conditions. Our results show that drought alone or combined with low root temperature led to excessive energetic pressure at the PSI! level. Heat dissipation was increased in both genotypes, but the high antioxidant capacity due to higher SOD and APX activities was genotype-dependent and it operated better in the drought-resistant genotype. High SOD and APX activities were associated with a rapid recovery of photosynthesis in IACSP94-2094 plants after drought and low substrate temperature alone or simultaneously. (C) 2013 Elsevier Masson SAS. All rights reserved.
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