Abstract
Drought stress is considered as the main factor of yield limitations in arid and semi-arid areas, where drought and salinity stresses are usually combined. Kochia species have recently attracted the attention of researchers as forage and fodder crop in marginal lands worldwide due to its drought and salt tolerant characters. This field experiment was performed at the Salinity Research Station (36°15´N, 59°28´E) of Ferdowsi University, Mashhad, Iran in 2008, in a split plot based on randomized complete block design with three replications. Three levels of drought stress (control, no irrigation in vegetative stage (recovery treatment) and no irrigation at reproductive stage for one month (stress treatment)), and two Kochia ecotypes (Birjand and Borujerd) were allocated as main and sub-plots, respectively. Relative water content (RWC), membrane permeability and antioxidant enzymes were assayed at the beginning of anthesis. Stress treatment caused a significant decrease in the leaf RWC and increase in electrolyte leakage compared with control and recovered conditions. Furthermore, stress treatment caused a significant increase in antioxidant enzyme activities except of superoxide dismutase (SOD) and peroxidase (POX). The Birjand ecotype was significantly more tolerant to drought than Borujerd ecotype. According to the results, there were no difference between recovered plants and control treatment, therefore, Kochia can recover quickly after removing drought stress. Kochia showed high tolerance against drought and salinity stresses and different antioxidant enzymes had different behavior under stress conditions.
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Claims 8
Claim · model-written summary
Reproductive-stage irrigation withdrawal significantly reduced leaf relative water content compared with control and recovered plants.
- Treatment
- Stress treatmente0
- Outcome
- leaf RWCe0
- Direction
- decreasee0
- Comparator
- control and recovered conditionse0
BassiaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stress treatment caused a significant decrease in the leaf RWC and increase in electrolyte leakage compared with control and recovered conditions.”
t0“Kochia (Kochia scoparia)”
Claim · model-written summary
Stress treatment significantly increased electrolyte leakage compared with control and recovered plants.
- Treatment
- Stress treatmente0
- Outcome
- electrolyte leakagee0
- Direction
- increasee0
- Comparator
- control and recovered conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stress treatment caused a significant decrease in the leaf RWC and increase in electrolyte leakage compared with control and recovered conditions.”
t0“Kochia (Kochia scoparia)”
Claim · model-written summary
Stress treatment significantly increased antioxidant enzyme activities except SOD and POX.
- Treatment
- stress treatmente0
- Outcome
- antioxidant enzyme activitiese0
- Direction
- increasee0
- Qualifier
- except of superoxide dismutase (SOD) and peroxidase (POX)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stress treatment caused a significant increase in antioxidant enzyme activities except of superoxide dismutase (SOD) and peroxidase (POX).”
t0“Kochia (Kochia scoparia)”
Claim · model-written summary
The Birjand ecotype was significantly more drought tolerant than Borujerd.
- Material
- Birjand ecotypee0
- Outcome
- tolerant to droughte0
- Direction
- more tolerante0
- Comparator
- Borujerd ecotypee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Birjand ecotype was significantly more tolerant to drought than Borujerd ecotype.”
t0“Kochia (Kochia scoparia)”
Claim · model-written summary
Recovered plants did not differ from controls.
- Treatment
- recovered plantse0
- Outcome
- no differencee0
- Direction
- no differencee0
- Comparator
- control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there were no difference between recovered plants and control treatment”
t0“Kochia (Kochia scoparia)”
Claim · model-written summary
Kochia recovered quickly after drought stress was removed.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kochia can recover quickly after removing drought stress.”
Claim · model-written summary
Kochia showed high tolerance to drought and salinity stress.
- Outcome
- high tolerance against drought and salinity stressese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kochia showed high tolerance against drought and salinity stresses”
Claim · model-written summary
Different antioxidant enzymes behaved differently under stress.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“different antioxidant enzymes had different behavior under stress conditions.”
t0“Kochia (Kochia scoparia)”