Abstract
Acclimation of chlorophyll fluorescence was investigated in seven oat species (viz., Avena sativa, A. strigosa, A. brevis, A. vaviloviana, A. abyssinica, A. marocana and A. sterilis) under drought stress environment. Significant variation was observed among the different species of oats in relation to various parameters of chlorophyll fluorescence under stress and non stress environment. The level of chlorophyll fluorescence (Fs) and maximal fluorescence (Fms) were significantly decreased in all the species except in A. sterilis. The quantum yield and elctron transport rate (ETR) also decreased under stress. The photochemical quenching (qp) was equal under stress and non stress environment. However, drought stress increased non-photochemical quenching of chlorophyll fluorescence (qN). The photochemical efficiency of PSII (Fv/Fm) under stress was less affected at vegetative stage but reduced at flowering stage. Minimum decrease in Fv/Fm was recorded in A. abyssinica, A. sativa and A. sterilis at vegetative stage and in A. sterilis at flowering stage indicating the less effect of stress environment on photochemistry of PS II which intern their drought stress tolerance. As the tolerance of PSII against drought is high, the fluorescence parameter Fv/Fm is useful for selection of genotypes for drought tolerance.
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Claims 9
Claim · model-written summary
Fluorescence parameters varied significantly among oat species across stress conditions.
- Taxon
- oats
Avena sativae0 - Outcome
- parameters of chlorophyll fluorescencee0
- Setting
- stress and non stress environmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant variation was observed among the different species of oats in relation to various parameters of chlorophyll fluorescence under stress and non stress environment.”
Claim · model-written summary
Drought significantly decreased Fs and Fms in all species except A. sterilis.
- Outcome
- chlorophyll fluorescence (Fs) and maximal fluorescence (Fms)e0
- Direction
- decreasede0
- Qualifier
- except in A. sterilise0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Avena species”
e0“The level of chlorophyll fluorescence (Fs) and maximal fluorescence (Fms) were significantly decreased in all the species except in A. sterilis.”
Claim · model-written summary
Drought decreased quantum yield and electron transport rate.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Avena species”
e0“The quantum yield and elctron transport rate (ETR) also decreased under stress.”
Claim · model-written summary
Photochemical quenching was equal with and without stress.
- Treatment
- stresse0
- Outcome
- photochemical quenching (qp)e0
- Direction
- equale0
- Comparator
- non stress environmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Avena species”
e0“The photochemical quenching (qp) was equal under stress and non stress environment.”
Claim · model-written summary
Drought increased non-photochemical quenching.
- Treatment
- drought stresse0
- Outcome
- non-photochemical quenching of chlorophyll fluorescence (qN)e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Avena species”
e0“drought stress increased non-photochemical quenching of chlorophyll fluorescence (qN).”
Claim · model-written summary
Drought reduced Fv/Fm at flowering but affected it less at vegetative stage.
- Organ / stage
- flowering stagee0
- Treatment
- stresse0
- Outcome
- photochemical efficiency of PSII (Fv/Fm)e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Avena species”
e0“The photochemical efficiency of PSII (Fv/Fm) under stress was less affected at vegetative stage but reduced at flowering stage.”
Claim · model-written summary
A. abyssinica, A. sativa and A. sterilis had minimum vegetative Fv/Fm decrease.
- Taxon
- A. abyssinica, A. sativa and A. sterilisAvena sativa
Avena sterilisAvena abyssinicae0 - Organ / stage
- vegetative stagee0
- Outcome
- Fv/Fme0
- Direction
- Minimum decreasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Minimum decrease in Fv/Fm was recorded in A. abyssinica, A. sativa and A. sterilis at vegetative stage”
Claim · model-written summary
A. sterilis had minimum Fv/Fm decrease at flowering.
- Taxon
- A. sterilisAvena sterilise0
- Organ / stage
- flowering stagee0
- Outcome
- less effect of stress environment on photochemistry of PS IIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in A. sterilis at flowering stage indicating the less effect of stress environment on photochemistry of PS II”
Claim · model-written summary
The authors recommend Fv/Fm for selecting drought-tolerant genotypes.
- Outcome
- selection of genotypes for drought tolerancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Avena species”
e0“the fluorescence parameter Fv/Fm is useful for selection of genotypes for drought tolerance.”