Abstract
Sugarcane (Saccharum spp.) is the world most productive sugar producing crop, making an understanding of its stress physiology key to increasing both sugar and ethanol production. To understand the behavior and salt tolerance mechanisms of sugarcane, two cultivars commonly used in Brazilian agriculture, RB867515 and RB855536, were submitted to salt stress for 48 days. Physiological parameters including net photosynthesis, water potential, dry root and shoot mass and malondialdehyde (MDA) content of leaves were determined. Control plants of the two cultivars showed similar values for most traits apart from higher root dry mass in RB867515. Both cultivars behaved similarly during salt stress, except for MDA levels for which there was a delay in the response for cultivar RB867515. Analysis of leaf macro- and micronutrients concentrations was performed and the concentration of Mn(2+) increased on day 48 for both cultivars. In parallel, to observe the effects of salt stress on protein levels in leaves of the RB867515 cultivar, two-dimensional gel electrophoresis followed by MS analysis was performed. Four proteins were differentially expressed between control and salt-treated plants. Fructose 1,6-bisphosphate aldolase was down-regulated, a germin-like protein and glyceraldehyde 3-phosphate dehydrogenase showed increased expression levels under salt stress, and heat-shock protein 70 was expressed only in salt-treated plants. These proteins are involved in energy metabolism and defense-related responses and we suggest that they may be involved in protection mechanisms against salt stress in sugarcane.
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Claims 9
Claim · model-written summary
RB867515 had higher root dry mass under control conditions.
SaccharumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Control plants of the two cultivars showed similar values for most traits apart from higher root dry mass in RB867515”
t0“Saccharum spp.”
Claim · model-written summary
Both cultivars behaved similarly during salt stress for most traits.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both cultivars behaved similarly during salt stress”
t0“Saccharum spp.”
Claim · model-written summary
RB867515 had a delayed MDA response.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“except for MDA levels for which there was a delay in the response for cultivar RB867515”
t0“Saccharum spp.”
Claim · model-written summary
Mn(2+) concentration increased on day 48 in both cultivars.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentration of Mn(2+) increased on day 48 for both cultivars”
t0“Saccharum spp.”
Claim · model-written summary
Four proteins were differentially expressed between control and salt treated plants.
- Outcome
- proteins were differentially expressede0
- Value
- Four proteinse0
- Comparator
- control and salt-treated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Four proteins were differentially expressed between control and salt-treated plants”
t0“Saccharum spp.”
Claim · model-written summary
Fructose 1,6-bisphosphate aldolase was down-regulated.
- Gene
- Fructose 1,6-bisphosphate aldolasee0
- Outcome
- Fructose 1,6-bisphosphate aldolasee0
- Direction
- down-regulatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fructose 1,6-bisphosphate aldolase was down-regulated”
t0“Saccharum spp.”
Claim · model-written summary
A germin-like protein had increased expression under salt stress.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a germin-like protein and glyceraldehyde 3-phosphate dehydrogenase showed increased expression levels under salt stress”
t0“Saccharum spp.”
Claim · model-written summary
Glyceraldehyde 3-phosphate dehydrogenase had increased expression under salt stress.
- Treatment
- salt stresse0
- Gene
- glyceraldehyde 3-phosphate dehydrogenasee0
- Outcome
- expression levelse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a germin-like protein and glyceraldehyde 3-phosphate dehydrogenase showed increased expression levels under salt stress”
t0“Saccharum spp.”
Claim · model-written summary
Heat-shock protein 70 was expressed only in salt treated plants.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“heat-shock protein 70 was expressed only in salt-treated plants”
t0“Saccharum spp.”