Abstract
Two pot experiments and one field experiment were conducted on sugarcane to assess the effects of treatments expected to change total carbon assimilation on the partitioning of assimilate. In the first experiment pots of cultivars CP and N14 were arranged to simulate normal field spacing. At 5 months, plants were partially defoliated or left intact. In the subsequent four months, defoliation resulted in a small (not significant) decrease in total dry mass increment; it increased the proportional partitioning of assimilates to leaves in N14, whilst in CP it increased the proportional partitioning to stems. In both cultivars defoliation increased proportional allocation to non-structural dry matter, and thus sucrose, in the stem. In the second experiment pots of cv. CP were grown at normal spacing for 4 months, then left untreated, shaded, or placed further apart. During the subsequent four months shading decreased total dry matter increment, but increased proportional partitioning to the stems, and within stems to non-structural dry matter, and so sucrose. Widened spacing increased total assimilation, but decreased proportional allocation to stems; partitioning within the stems was not affected. In the field experiment plants of both cultivars were partially defoliated at 6 months, or left intact. Defoliation resulted in only a very small decrease in stem dry mass increment during the subsequent four months (leaves were not measured). Within the stem partial defoliation caused proportionally increased partitioning to non-structural dry matter, hence to sucrose. The results suggest that sucrose storage receives priority in the allocation of assimilate, rather than representing the accumulation of assimilate not required for vegetative growth.
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Claims 13
Claim · model-written summary
In sugarcane, defoliation changed total dry mass increment (decrease).
Not reportedComparator
Verbatim
e0“defoliation resulted in a small (not significant) decrease in total dry mass increment”
t0“sugarcane”
Claim · model-written summary
In sugarcane, defoliation changed proportional partitioning of assimilates to leaves (increased).
- Taxon
- sugarcanet0
- Material
- N14e0
- Outcome
- proportional partitioning of assimilates to leavese0
- Direction
- increasede0
Not reportedTreatmentComparator
Verbatim
e0“it increased the proportional partitioning of assimilates to leaves in N14”
t0“sugarcane”
Claim · model-written summary
In sugarcane, defoliation changed proportional partitioning to stems (increased).
Not reportedTreatmentComparator
Verbatim
e0“whilst in CP it increased the proportional partitioning to stems”
t0“sugarcane”
Claim · model-written summary
In sugarcane, defoliation changed proportional allocation to non-structural dry matter (increased).
- Taxon
- sugarcanet0
- Treatment
- defoliatione0
- Outcome
- proportional allocation to non-structural dry mattere0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“In both cultivars defoliation increased proportional allocation to non-structural dry matter, and thus sucrose, in the stem”
t0“sugarcane”
Claim · model-written summary
In sugarcane, shading changed total dry matter increment (decreased).
Not reportedMaterialComparator
Verbatim
e0“shading decreased total dry matter increment”
t0“sugarcane”
Claim · model-written summary
In sugarcane, shading changed proportional partitioning to the stems (increased).
Not reportedMaterialTreatmentComparator
Verbatim
e0“but increased proportional partitioning to the stems, and within stems to non-structural dry matter, and so sucrose”
t0“sugarcane”
Claim · model-written summary
In sugarcane, shading changed non-structural dry matter (increased).
Not reportedMaterialTreatmentComparator
Verbatim
e0“but increased proportional partitioning to the stems, and within stems to non-structural dry matter, and so sucrose”
t0“sugarcane”
Claim · model-written summary
In sugarcane, Widened spacing changed total assimilation (increased).
Not reportedMaterialComparator
Verbatim
e0“Widened spacing increased total assimilation”
t0“sugarcane”
Claim · model-written summary
In sugarcane, Widened spacing changed proportional allocation to stems (decreased).
Not reportedMaterialTreatmentComparator
Verbatim
e0“but decreased proportional allocation to stems”
t0“sugarcane”
Claim · model-written summary
In sugarcane, Widened spacing changed partitioning within the stems (not affected).
Not reportedMaterialTreatmentComparator
Verbatim
e0“partitioning within the stems was not affected”
t0“sugarcane”
Claim · model-written summary
In sugarcane, Defoliation changed stem dry mass increment (decrease).
Not reportedComparator
Verbatim
e0“Defoliation resulted in only a very small decrease in stem dry mass increment”
t0“sugarcane”
Claim · model-written summary
In sugarcane, partial defoliation changed partitioning to non-structural dry matter (increased).
- Taxon
- sugarcanet0
- Treatment
- partial defoliatione0
- Outcome
- partitioning to non-structural dry mattere0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Within the stem partial defoliation caused proportionally increased partitioning to non-structural dry matter, hence to sucrose”
t0“sugarcane”
Claim · model-written summary
Sucrose storage appears to receive priority in assimilate allocation.
Verbatim
e0“The results suggest that sucrose storage receives priority in the allocation of assimilate, rather than representing the accumulation of assimilate not required for vegetative growth.”
t0“sugarcane”