Abstract
Remobilization and transfer of the pre‐stored food in vegetative tissues to the grains in monocarpic plants require the initiation of whole plant senescence. However, mechanisms by which plant senescence promotes remobilization of assimilates are rather obscure. This study examined the relationship between the senescence induced by water deficits and C remobilization during grain fill. Two semi‐winter wheat cultivars ( Triticum aestivum L.),Yangmai 158 and Yangmai 931, were treated with two levels of nitrogen (normal [NN] or high [HN]) and three levels of soil moisture (well‐watered, moderate water deficit, and severe water deficit). Results showed that water deficits enhanced the senescence by accelerating loss of leaf nitrogen and chlorophyll and increasing lipid peroxidation. At maturity, 75 to 92% of pre‐anthesis 14 C stored in the straw was reallocated to grains in water‐deficit treatments, 50 to 80% higher than the amount in well‐watered treatments, indicating that water deficits promoted remobilization. The peak values of abscisic acid (ABA) in both leaves and grains under water‐deficit treatments were 63 to 144% higher than those under well‐watered treatments. The elevated ABA level correlated with the degree of earlier leaf senescence, the 14 C partitioning into grains, and the carbon remobilization. The activites of both acid invertase (INV) and sucrose synthase (SS) in grains were also enhanced by water deficits at the midstage of grain fill. Our results suggest that the senescence and remobilization promoted by water deficits during grain fill are coupled processes in wheat, and elevated ABA concentration may play a regulative role.
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Claims 10
Claim · model-written summary
Water deficits enhanced wheat senescence.
- Taxon
- Wheat
Triticum aestivumt0 - Treatment
- water deficitse0
- Outcome
- senescencee0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water deficits enhanced the senescence by accelerating loss of leaf nitrogen and chlorophyll and increasing lipid peroxidation”
t0“Wheat”
Claim · model-written summary
Water deficits accelerated leaf nitrogen and chlorophyll loss.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- water deficitse0
- Outcome
- loss of leaf nitrogen and chlorophylle0
- Direction
- acceleratinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water deficits enhanced the senescence by accelerating loss of leaf nitrogen and chlorophyll and increasing lipid peroxidation”
t0“Wheat”
Claim · model-written summary
Water deficits increased lipid peroxidation.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- water deficitse0
- Outcome
- lipid peroxidatione0
- Direction
- increasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water deficits enhanced the senescence by accelerating loss of leaf nitrogen and chlorophyll and increasing lipid peroxidation”
t0“Wheat”
Claim · model-written summary
Water deficits reallocated 75 to 92% of pre-anthesis straw carbon to grains, 50 to 80% above well-watered treatments.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- water‐deficit treatmentse0
- Outcome
- reallocated to grainse0
- Direction
- highere0
- Value
- 75 to 92%e0
- Qualifier
- 50 to 80% highere0
- Comparator
- well‐watered treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At maturity, 75 to 92% of pre‐anthesis 14 C stored in the straw was reallocated to grains in water‐deficit treatments, 50 to 80% higher than the amount in well‐watered treatments, indicating that water deficits promoted remobilization.”
t0“Wheat”
Claim · model-written summary
Water deficits raised peak leaf ABA by 63 to 144%.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- leavese0
- Treatment
- water‐deficit treatmentse0
- Outcome
- peak values of abscisic acid (ABA)e0
- Direction
- highere0
- Value
- 63 to 144%e0
- Comparator
- well‐watered treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The peak values of abscisic acid (ABA) in both leaves and grains under water‐deficit treatments were 63 to 144% higher than those under well‐watered treatments.”
t0“Wheat”
Claim · model-written summary
Water deficits raised peak grain ABA by 63 to 144%.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- grainse0
- Treatment
- water‐deficit treatmentse0
- Outcome
- peak values of abscisic acid (ABA)e0
- Direction
- highere0
- Value
- 63 to 144%e0
- Comparator
- well‐watered treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The peak values of abscisic acid (ABA) in both leaves and grains under water‐deficit treatments were 63 to 144% higher than those under well‐watered treatments.”
t0“Wheat”
Claim · model-written summary
Elevated ABA correlated with earlier senescence, grain carbon partitioning and remobilization.
- Taxon
- WheatTriticum aestivumt0
- Compound
- ABAe0
- Outcome
- earlier leaf senescence, the 14 C partitioning into grains, and the carbon remobilizatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The elevated ABA level correlated with the degree of earlier leaf senescence, the 14 C partitioning into grains, and the carbon remobilization.”
t0“Wheat”
Claim · model-written summary
Water deficits enhanced grain acid invertase and sucrose synthase activities during mid grain fill.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- grainse0
- Treatment
- water deficitse0
- Gene
- acid invertase (INV) and sucrose synthase (SS)e0
- Outcome
- activitese0
- Direction
- enhancede0
- Qualifier
- midstage of grain fille0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activites of both acid invertase (INV) and sucrose synthase (SS) in grains were also enhanced by water deficits at the midstage of grain fill.”
t0“Wheat”
Claim · model-written summary
Water-deficit-induced senescence and remobilization are suggested to be coupled processes.
- Taxon
- wheatTriticum aestivume0
- Treatment
- water deficitse0
- Outcome
- senescence and remobilizatione0
- Qualifier
- coupled processese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the senescence and remobilization promoted by water deficits during grain fill are coupled processes in wheat”
Claim · model-written summary
Elevated ABA may regulate the coupled processes.
- Taxon
- wheatTriticum aestivume0
- Compound
- ABAe0
- Outcome
- coupled processese0
- Qualifier
- may play a regulative rolee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“coupled processes in wheat, and elevated ABA concentration may play a regulative role”
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