Abstract
Abstract Alfalfa ( Medicago sativa L.) cultivars respond differently to drought stress levels and oxidative injury. This may provide us with an important tool to identify the chemical mechanisms operative in drought tolerant genotypes. The present experiment was conducted to determine catalase ( CAT ), ascorbate peroxidase ( APX ) and peroxidase ( POX ) activities; malondialdehyde ( MDA ) content; herbage yield; stress susceptibility index ( SSI ); and drought tolerance index ( DTI ) of 10 alfalfa cultivars under four irrigation regimes (55, 65, 75 and 85% depletion of available soil water). Drought stress was observed to reduce herbage yield but increase CAT , APX and POX activities as well as MDA content; however, such alterations were cultivar‐drought level‐specific. With a few exceptions, Baghdadi had the highest CAT , POX and APX activities and lowest MDA content, lowest reduction in herbage yield and the lowest SSI and the highest DTI under all irrigation regimes suggesting that it was the most adapted and drought‐tolerant cultivar. Herbage yield had a significant and positive correlation with POX and a significant and negative correlation with MDA under all irrigation regimes indicating that they could be used as markers for selecting more drought‐tolerant cultivars in alfalfa. Catalase and APX also had a significant and positive correlation with herbage yield, thus they could be used as markers for selection of more drought‐tolerant cultivars. The results suggested that a wide variation in drought tolerance exists within alfalfa cultivars, thus selection for more drought tolerance is possible. In addition, chemical markers such as POX , CAT and APX activities and MDA content may be used to assist in selection for more drought tolerance cultivar in this species.
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Claims 14
Claim · model-written summary
Drought stress reduced herbage yield in alfalfa.
- Taxon
- alfalfa
Medicago sativat0 - Treatment
- Drought stresse1
- Outcome
- herbage yielde1
- Direction
- reducee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e1“Drought stress was observed to reduce herbage yield”
Claim · model-written summary
Drought stress increased catalase, ascorbate peroxidase and peroxidase activities in alfalfa.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- Drought stresse1
- Outcome
- CAT , APX and POX activitiese1
- Direction
- increasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e1“Drought stress was observed to reduce herbage yield but increase CAT , APX and POX activities”
Claim · model-written summary
Drought stress increased malondialdehyde content in alfalfa.
- Taxon
- alfalfaMedicago sativat0
- Treatment
- Drought stresse1
- Outcome
- MDA contente1
- Direction
- increasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e1“Drought stress was observed to reduce herbage yield but increase CAT , APX and POX activities as well as MDA content”
Claim · model-written summary
Cultivar Baghdadi generally had the highest CAT, POX and APX activities under all irrigation regimes.
- Taxon
- alfalfaMedicago sativat0
- Material
- Baghdadie1
- Outcome
- CAT , POX and APX activitiese2
- Direction
- higheste2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e1“Baghdadi”
e2“highest CAT , POX and APX activities”
Claim · model-written summary
Cultivar Baghdadi generally had the lowest MDA content.
- Taxon
- alfalfaMedicago sativat0
- Material
- Baghdadie1
- Outcome
- MDA contente2
- Direction
- loweste2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e1“Baghdadi”
e2“lowest MDA content”
Claim · model-written summary
Cultivar Baghdadi generally had the lowest reduction in herbage yield under drought.
- Taxon
- alfalfaMedicago sativat0
- Material
- Baghdadie1
- Outcome
- reduction in herbage yielde2
- Direction
- loweste2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e1“Baghdadi”
e2“lowest reduction in herbage yield”
Claim · model-written summary
Cultivar Baghdadi generally had the lowest stress susceptibility index.
- Taxon
- alfalfaMedicago sativat0
- Material
- Baghdadie1
- Outcome
- SSIe2
- Direction
- loweste2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e1“Baghdadi”
e2“lowest SSI”
Claim · model-written summary
Cultivar Baghdadi generally had the highest drought tolerance index.
- Taxon
- alfalfaMedicago sativat0
- Material
- Baghdadie1
- Outcome
- DTIe2
- Direction
- higheste2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e1“Baghdadi”
e2“highest DTI”
Claim · model-written summary
The authors suggest Baghdadi was the most adapted and drought-tolerant of the alfalfa cultivars.
- Taxon
- alfalfaMedicago sativat0
- Material
- Baghdadie1
- Outcome
- the most adapted and drought-tolerant cultivare2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e1“Baghdadi”
e2“the most adapted and drought-tolerant cultivar”
Claim · model-written summary
Herbage yield correlated significantly and positively with peroxidase activity in alfalfa.
- Taxon
- alfalfaMedicago sativat0
- Gene
- POXe2
- Outcome
- Herbage yielde1
- Direction
- positivee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e1“Herbage yield”
e2“a significant and positive correlation with POX”
Claim · model-written summary
Herbage yield correlated significantly and negatively with MDA content in alfalfa.
- Taxon
- alfalfaMedicago sativat0
- Compound
- MDAe2
- Outcome
- Herbage yielde1
- Direction
- negativee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e1“Herbage yield”
e2“a significant and negative correlation with MDA”
Claim · model-written summary
Catalase and ascorbate peroxidase activities correlated significantly and positively with herbage yield in alfalfa.
- Taxon
- alfalfaMedicago sativat0
- Gene
- Catalase and APXe1
- Outcome
- herbage yielde1
- Direction
- positivee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e1“Catalase and APX also had a significant and positive correlation with herbage yield”
Claim · model-written summary
The authors conclude a wide variation in drought tolerance exists within alfalfa cultivars, so selection for more drought tolerance is possible.
- Taxon
- alfalfaMedicago sativae1
- Outcome
- a wide variation in drought tolerancee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“a wide variation in drought tolerance exists within alfalfa cultivars”
Claim · model-written summary
The authors recommend POX, CAT and APX activities and MDA content as chemical markers to assist selection for more drought-tolerant alfalfa cultivars.
- Taxon
- alfalfaMedicago sativat0
- Outcome
- selection for more drought tolerancee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“alfalfa”
e1“chemical markers such as POX , CAT and APX activities and MDA content may be used to assist in selection for more drought tolerance cultivar”
The same questions in other papers
drought · yield · Medicago sativa (alfalfa)Positive and negative results
19 papers in the same direction as this paper · 4 in the opposite direction
- positive
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See all 24 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.