Abstract
Eight chickpea advanced breeding lines (ABLs) and their parents were evaluated for osmotic adjustment (OA), leaf carbohydrates and gas exchange under dryland field . These (ABLs) were derived from crosses between CTS 60543 x Kaniva and Tyson x Kaniva. Mean leaf water potential (LWP) fell down from -1.00 MPa at pre-stress level to about -2.25 MPa during terminal stress. Relative water content (RWC) showed periodic changes with alternate decrease or increase at certain interval, which also influenced the values of OA (low or high) in number of genotypes e.g. Kaniva, CTS 60543, Tyson and M 75. Significant variation in OA ranging 0.45 to 0.88 MPa was observed at high level of stress at -2.5 MPa. However, none of the genotypes showed stability of OA over the period of stress. Leaf starch declined even at mild stress (LWP, -1.6 MPa) resulting in an increase in hexose sugars and activation state of sucrose-phosphate synthase (SPS) that led to accumulation of sucrose. Both photosynthesis (Pmax) and transpiration decreased concurrently in two chickpea lines M 129 and Tyson with increasing water stress. However, rate of decline in the photosynthesis slowed down even drought was further intensified. The observed periodic changes in OA, RWC and photosynthesis appeared to be associated with drought-induced changes in SPS and carbohydrates which modify water uptake of the leaves.
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Claims 12
Claim · model-written summary
Chickpea leaf water potential declined from -1.00 MPa before stress to about -2.25 MPa under terminal stress.
- Taxon
- chickpea
Cicer arietinumt0 - Organ / stage
- leafe0
- Outcome
- leaf water potentiale0
- Direction
- fell downe0
- Value
- -2.25 MPae0
- Qualifier
- -1.00 MPae0
- Comparator
- pre-stress levele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mean leaf water potential (LWP) fell down from -1.00 MPa at pre-stress level to about -2.25 MPa during terminal stress”
t0“chickpea”
Claim · model-written summary
Chickpea relative water content alternately decreased and increased during stress.
- Taxon
- chickpeaCicer arietinumt0
- Outcome
- Relative water contente0
- Direction
- alternate decrease or increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative water content (RWC) showed periodic changes with alternate decrease or increase at certain interval”
t0“chickpea”
Claim · model-written summary
Chickpea osmotic adjustment varied significantly from 0.45 to 0.88 MPa at high stress.
- Taxon
- chickpeaCicer arietinumt0
- Outcome
- osmotic adjustmente1
- Value
- 0.45 to 0.88 MPae0
- Qualifier
- high level of stress at -2.5 MPae0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant variation in OA ranging 0.45 to 0.88 MPa was observed at high level of stress at -2.5 MPa”
e1“osmotic adjustment (OA)”
t0“chickpea”
Claim · model-written summary
No chickpea genotype maintained stable osmotic adjustment through stress.
- Taxon
- chickpeaCicer arietinumt0
- Outcome
- stability of OAe0
- Qualifier
- over the period of stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“none of the genotypes showed stability of OA over the period of stress”
e1“osmotic adjustment (OA)”
t0“chickpea”
Claim · model-written summary
Chickpea leaf starch declined even at mild drought stress.
- Taxon
- chickpeaCicer arietinumt0
- Organ / stage
- Leafe0
- Outcome
- Leaf starche0
- Direction
- declinede0
- Qualifier
- mild stress (LWP, -1.6 MPa)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf starch declined even at mild stress (LWP, -1.6 MPa)”
t0“chickpea”
Claim · model-written summary
Chickpea hexose sugars increased as leaf starch declined under mild stress.
- Taxon
- chickpeaCicer arietinumt0
- Outcome
- hexose sugarse0
- Direction
- increasee0
- Qualifier
- mild stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf starch declined even at mild stress (LWP, -1.6 MPa) resulting in an increase in hexose sugars”
t0“chickpea”
Claim · model-written summary
Chickpea sucrose-phosphate synthase activation state increased as starch declined.
- Taxon
- chickpeaCicer arietinumt0
- Gene
- sucrose-phosphate synthase (SPS)e0
- Outcome
- activation state of sucrose-phosphate synthase (SPS)e0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“resulting in an increase in hexose sugars and activation state of sucrose-phosphate synthase (SPS)”
t0“chickpea”
Claim · model-written summary
Chickpea sucrose accumulated under mild stress as starch declined.
- Taxon
- chickpeaCicer arietinumt0
- Outcome
- accumulation of sucrosee0
- Qualifier
- mild stresse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“that led to accumulation of sucrose”
e1“Leaf starch declined even at mild stress (LWP, -1.6 MPa)”
t0“chickpea”
Claim · model-written summary
Photosynthesis decreased with rising water stress in chickpea lines M 129 and Tyson.
- Taxon
- chickpeaCicer arietinume0
- Material
- M 129 and Tysone0
- Treatment
- increasing water stresse0
- Outcome
- photosynthesis (Pmax)e0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both photosynthesis (Pmax) and transpiration decreased concurrently in two chickpea lines M 129 and Tyson with increasing water stress”
Claim · model-written summary
Transpiration decreased with rising water stress in chickpea lines M 129 and Tyson.
- Taxon
- chickpeaCicer arietinume0
- Material
- M 129 and Tysone0
- Treatment
- increasing water stresse0
- Outcome
- transpiratione0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both photosynthesis (Pmax) and transpiration decreased concurrently in two chickpea lines M 129 and Tyson with increasing water stress”
Claim · model-written summary
The rate of photosynthesis decline slowed as chickpea drought intensified.
- Taxon
- chickpeaCicer arietinumt0
- Outcome
- rate of decline in the photosynthesise0
- Direction
- slowed downe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rate of decline in the photosynthesis slowed down even drought was further intensified”
t0“chickpea”
Claim · model-written summary
The authors associate periodic chickpea osmotic adjustment, water status and photosynthesis with drought-induced SPS and carbohydrate changes.
- Taxon
- chickpeaCicer arietinumt0
- Gene
- SPSe0
- Outcome
- water uptake of the leavese0
- Qualifier
- appeared to be associated withe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The observed periodic changes in OA, RWC and photosynthesis appeared to be associated with drought-induced changes in SPS and carbohydrates which modify water uptake of the leaves”
t0“chickpea”