Photosynthetic and antioxidant responses to drought during sugarcane ripening

Title:

Photosynthetic and antioxidant responses to drought during sugarcane ripening

Creator:

Sales, C. R. G., Marchiori, P. E. R., Machado, R. S., Fontenele, A. V., Machado, E. C., Silveira, J. A. G., and Ribeiro, R. V.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:bf726d14-8d2d-4d04-bf43-dbb63301276a
uuid:bf726d14-8d2d-4d04-bf43-dbb63301276a
issn:0300-3604
doi:10.1007/s11099-015-0146-x

Subject:

fotosyntéza, photosynthesis, chlorophyll fluorescence, leaf gas exchange, oxidative stress, water stress, 2, and 581

Type:

model:article and TEXT

Format:

print, bez média, and svazek

Description:

Water deficit is an important exogenous factor that enhances the influx of sucrose into sugarcane (Saccharum spp.) stem internodes during ripening, when photosynthetic ability in supplying sinks is essential. The aim of this study was to test the hypothesis that drought tolerance in sugarcane is associated with an effective antioxidant protection during the ripening phase that might maintain a favorable redox balance in chloroplasts and protect photosynthesis under drought conditions. Two commercial sugarcane varieties, IACSP94-2094 (tolerant) and IACSP96-2042 (sensitive), with contrasting behavior under water deficit, were subjected to water withholding during the ripening stage. Our results revealed that the tolerant variety was less affected by water deficit, maintaining photosynthesis for a longer period and showing a faster recovery after rehydration as compared to the sensitive one. As consequence, the tolerant variety faced lesser excess of light energy at PSII. The maintenance of photosynthesis under water deficit and its fast recovery after rehydration resulted in the lower leaf H2O2 concentration and favorable redox status in the drought-tolerant genotype, which was associated with stimulation of superoxide dismutase during ripening. Our results also revealed that ferric superoxide dismutase isoforms were strongly enhanced under drought conditions, playing an important role in chloroplast redox homeostasis., C. R. G. Sales, P. E. R. Marchiori, R. S. Machado, A. V. Fontenele, E. C. Machado, J. A. G. Silveira, R. V. Ribeiro., and Obsahuje seznam literatury

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

547-554

Source:

Photosynthetica | 2015 Volume:53 | Number:4

Harvested from:

CDK

Metadata only:

false