Abstract
In the present research we studied the photosynthetic traits and protective mechanisms against oxidative stress in two maize (Zea mays L.) genotypes differing in chilling sensitivity (Z7, tolerant and Penjalinan, sensitive) subjected to 5 degrees C for 5 days, with or without pretreatment by drought. The drought pretreatment decreased the symptoms of chilling injury in Penjalinan plants estimated as necrotic leaf area and maximum quantum yield of photosystem II. Furthermore, drought pretreatment diminished the level of lipid peroxidation caused by chilling in Penjalinan plants. After one day of recovery from chilling the Z7 and drought-pretreated Penjalinan plants showed higher net photosynthesis rates than the non-drought-pretreated Penjalinan plants, thereby decreasing the probability of generating reactive oxygen species. The greater net photosynthesis was correlated with the greater NADP-malate dehydrogenase activity. No differences in either the de-epoxidation state of the xanthophyll cycle or the antioxidant enzyme activities were found among the chilled groups of plants. However, a drastic decrease in ascorbate content was observed in chilled Penjalinan plants without drought pretreatment. As we found an increase of H2O2 content after drought pretreatment, we suggest its involvement as a signal in the drought-enhanced chilling tolerance of maize.
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Claims 10
Claim · model-written summary
Drought pretreatment reduced chilling injury symptoms in Penjalinan.
- Material
- Penjalinane0
- Organ / stage
- leafe0
- Treatment
- drought pretreatmente0
- Outcome
- symptoms of chilling injurye0
- Direction
- decreasede0
- Comparator
- non-drought-pretreated Penjalinan plantse2
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The drought pretreatment decreased the symptoms of chilling injury in Penjalinan plants estimated as necrotic leaf area and maximum quantum yield of photosystem II.”
e1“maize (Zea mays L.)”
e2“non-drought-pretreated Penjalinan plants”
Claim · model-written summary
Drought pretreatment reduced chilling-induced lipid peroxidation in Penjalinan.
- Material
- Penjalinane0
- Treatment
- drought pretreatmente0
- Outcome
- level of lipid peroxidatione0
- Direction
- diminishede0
- Comparator
- non-drought-pretreated Penjalinan plantse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought pretreatment diminished the level of lipid peroxidation caused by chilling in Penjalinan plants.”
e1“maize (Zea mays L.)”
e2“non-drought-pretreated Penjalinan plants”
Claim · model-written summary
After one recovery day, Z7 had higher net photosynthesis than Penjalinan without drought pretreatment.
- Material
- Z7e0
- Outcome
- net photosynthesis ratese0
- Direction
- highere0
- Qualifier
- After one day of recovery from chillinge0
- Comparator
- non-drought-pretreated Penjalinan plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After one day of recovery from chilling the Z7 and drought-pretreated Penjalinan plants showed higher net photosynthesis rates than the non-drought-pretreated Penjalinan plants”
e1“maize (Zea mays L.)”
Claim · model-written summary
After one recovery day, drought-pretreated Penjalinan had higher net photosynthesis than untreated Penjalinan.
- Material
- Penjalinane0
- Treatment
- drought-pretreatede0
- Outcome
- net photosynthesis ratese0
- Direction
- highere0
- Qualifier
- After one day of recovery from chillinge0
- Comparator
- non-drought-pretreated Penjalinan plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After one day of recovery from chilling the Z7 and drought-pretreated Penjalinan plants showed higher net photosynthesis rates than the non-drought-pretreated Penjalinan plants”
e1“maize (Zea mays L.)”
Claim · model-written summary
Net photosynthesis covaried positively with NADP-malate dehydrogenase activity.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The greater net photosynthesis was correlated with the greater NADP-malate dehydrogenase activity.”
e1“maize (Zea mays L.)”
Claim · model-written summary
Chilled groups did not differ in xanthophyll-cycle de-epoxidation state.
- Outcome
- de-epoxidation state of the xanthophyll cyclee0
- Direction
- No differencese0
- Comparator
- chilled groups of plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No differences in either the de-epoxidation state of the xanthophyll cycle or the antioxidant enzyme activities were found among the chilled groups of plants.”
e1“maize (Zea mays L.)”
Claim · model-written summary
Chilled groups did not differ in antioxidant enzyme activity.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No differences in either the de-epoxidation state of the xanthophyll cycle or the antioxidant enzyme activities were found among the chilled groups of plants.”
e1“maize (Zea mays L.)”
Claim · model-written summary
Chilled Penjalinan without drought pretreatment had markedly lower ascorbate content.
- Material
- Penjalinane0
- Outcome
- ascorbate contente0
- Direction
- decreasee0
- Qualifier
- without drought pretreatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a drastic decrease in ascorbate content was observed in chilled Penjalinan plants without drought pretreatment.”
e1“maize (Zea mays L.)”
Claim · model-written summary
Drought pretreatment increased H2O2 content.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“we found an increase of H2O2 content after drought pretreatment”
e1“maize (Zea mays L.)”
Claim · model-written summary
The authors suggest H2O2 signals drought-enhanced chilling tolerance.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“we suggest its involvement as a signal in the drought-enhanced chilling tolerance of maize.”
e1“H2O2 content”
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See all 121 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.