Abstract
Wheat leaf non-sequential senescence at the late grain-filling stage involves the early senescence of younger flag leaves compared to that observed in older second leaves. On the other hand, sequential senescence involves leaf senescence that follows an age-related pattern, in which flag leaves are the latest to undergo senescence. The characteristics of sugar metabolism in two sequential senescence cultivars and two non-sequential senescence cultivars under both natural and drought conditions were studied to elucidate the underlying mechanism of drought tolerance in two different senescence modes. The results showed that compared to sequential senescence wheat cultivars, under natural and drought conditions, non-sequential senescence wheat cultivars showed a higher leaf net photosynthetic rate, higher soluble sugar levels in leaves, leaf sheaths, and internodes, higher leaf sucrose synthase (SS) and sucrose phosphate synthase (SPS) activity, and higher grain SS activity, thereby suggesting that non-sequential senescence wheat cultivars had stronger source activity. Spike weight, grain weight per spike, and 100-grain weight of non-sequential senescence cultivars at maturity were significantly higher than those of sequential senescence cultivars under both natural and drought conditions. These findings indicate that the higher rate of accumulation and the higher mobilization of soluble sugar in the leaves, leaf sheaths and internodes of non-sequential senescence cultivars improve grain weight and drought tolerance. At the late grain-filling stage, drought conditions adversely affected leaf chlorophyll content, net photosynthetic rate, soluble sugar and sucrose content, SS and SPS activity, gain SS activity, and weight. This study showed that higher rates of soluble sugar accumulation in the source was one of the reasons of triggering leaf non-sequential senescence, and higher rates of soluble sugar mobilization during leaf non-sequential senescence promoted high and stable wheat yield and drought tolerance.
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Claims 11
Claim · model-written summary
Non-sequential senescence cultivars had higher leaf net photosynthetic rate under natural and drought conditions.
- Taxon
- Wheat
Triticum aestivumt0 - Material
- non-sequential senescence wheat cultivarse0
- Outcome
- leaf net photosynthetic ratee0
- Direction
- highere0
- Comparator
- sequential senescence wheat cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat”
e0“compared to sequential senescence wheat cultivars, under natural and drought conditions, non-sequential senescence wheat cultivars showed a higher leaf net photosynthetic rate”
Claim · model-written summary
Non-sequential cultivars had higher soluble sugar in leaves, leaf sheaths and internodes under both conditions.
- Taxon
- WheatTriticum aestivumt0
- Material
- non-sequential senescence wheat cultivarse0
- Outcome
- soluble sugar levels in leaves, leaf sheaths, and internodese0
- Direction
- highere0
- Comparator
- sequential senescence wheat cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat”
e0“compared to sequential senescence wheat cultivars, under natural and drought conditions, non-sequential senescence wheat cultivars showed a higher leaf net photosynthetic rate, higher soluble sugar levels in leaves, leaf sheaths, and internodes”
Claim · model-written summary
Leaf SS and SPS activities were higher in non-sequential cultivars under natural and drought conditions.
- Taxon
- WheatTriticum aestivumt0
- Material
- non-sequential senescence wheat cultivarse1
- Outcome
- leaf sucrose synthase (SS) and sucrose phosphate synthase (SPS) activitye0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat”
e0“higher leaf sucrose synthase (SS) and sucrose phosphate synthase (SPS) activity”
e1“compared to sequential senescence wheat cultivars, under natural and drought conditions, non-sequential senescence wheat cultivars showed a higher leaf net photosynthetic rate”
Claim · model-written summary
Grain SS activity was higher in non-sequential cultivars.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- grain SS activitye0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat”
e0“higher grain SS activity”
Claim · model-written summary
Spike weight, grain weight per spike and 100-grain weight were significantly higher in non-sequential cultivars under both conditions.
- Taxon
- WheatTriticum aestivumt0
- Material
- non-sequential senescence cultivarse0
- Organ / stage
- at maturitye0
- Outcome
- Spike weight, grain weight per spike, and 100-grain weighte0
- Direction
- highere0
- Comparator
- sequential senescence cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat”
e0“Spike weight, grain weight per spike, and 100-grain weight of non-sequential senescence cultivars at maturity were significantly higher than those of sequential senescence cultivars under both natural and drought conditions.”
Claim · model-written summary
Higher sugar accumulation and mobilization in non-sequential cultivars was interpreted to improve grain weight and drought tolerance.
- Taxon
- WheatTriticum aestivumt0
- Material
- non-sequential senescence cultivarse0
- Outcome
- grain weight and drought tolerancee0
- Qualifier
- higher rate of accumulation and the higher mobilization of soluble sugare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat”
e0“higher rate of accumulation and the higher mobilization of soluble sugar in the leaves, leaf sheaths and internodes of non-sequential senescence cultivars improve grain weight and drought tolerance”
Claim · model-written summary
Drought adversely affected leaf chlorophyll content, net photosynthetic rate and soluble sugar content at late grain filling.
- Taxon
- WheatTriticum aestivumt0
- Organ / stage
- late grain-filling stagee0
- Treatment
- drought conditionse0
- Outcome
- leaf chlorophyll content, net photosynthetic rate, soluble sugar and sucrose contente0
- Direction
- adversely affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat”
e0“At the late grain-filling stage, drought conditions adversely affected leaf chlorophyll content, net photosynthetic rate, soluble sugar and sucrose content, SS and SPS activity, gain SS activity, and weight.”
Claim · model-written summary
Drought adversely affected SS and SPS activity and grain SS activity at late grain filling.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- drought conditionse0
- Outcome
- SS and SPS activity, gain SS activitye0
- Direction
- adversely affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat”
e0“At the late grain-filling stage, drought conditions adversely affected leaf chlorophyll content, net photosynthetic rate, soluble sugar and sucrose content, SS and SPS activity, gain SS activity, and weight.”
Claim · model-written summary
Drought adversely affected weight at late grain filling.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- drought conditionse0
- Outcome
- weighte0
- Direction
- adversely affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat”
e0“At the late grain-filling stage, drought conditions adversely affected leaf chlorophyll content, net photosynthetic rate, soluble sugar and sucrose content, SS and SPS activity, gain SS activity, and weight.”
Claim · model-written summary
Higher source sugar accumulation was interpreted as a trigger of non-sequential leaf senescence.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- leaf non-sequential senescencee0
- Qualifier
- higher rates of soluble sugar accumulation in the sourcee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat”
e0“higher rates of soluble sugar accumulation in the source was one of the reasons of triggering leaf non-sequential senescence”
Claim · model-written summary
Higher sugar mobilization during non-sequential senescence was interpreted to promote high and stable wheat yield and drought tolerance.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- high and stable wheat yield and drought tolerancee0
- Qualifier
- higher rates of soluble sugar mobilizatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Wheat”
e0“higher rates of soluble sugar mobilization during leaf non-sequential senescence promoted high and stable wheat yield and drought tolerance”
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