Abstract
Abstract Moderate soil drying (MD) applied during the mid‐to‐late grain filling stages can promote carbon reserve remobilization in straws (sheaths and stems) and increase the grain weight. The coordination between starch‐to‐sucrose transition in straws and sucrose‐to‐starch conversion in inferior grains is essential for carbon reserve remobilization during grain filling. Herein, to reveal the regulating mechanism of carbon reserve remobilization from source to sink, RNA‐seq was utilized to analyze the dynamic transcript profile in source and sink of rice under MD treatment during grain filling. The expression of amylase genes and amylase activity was enhanced by MD treatment in straws, which is consistent with the increased amylase activity. In inferior grains, it was starch synthesis genes that were upregulated by MD treatment. Furthermore, an elevated ABA was found in both straws and inferior grains, which was caused by an increased expression of NCED1 and downregulation of ABA8OX2 by MD treatment, respectively. Additionally, the expression of MYB30, a transcription factor (TF) that negatively regulates beta‐amylase genes, was reduced in straws by MD, resulting in an increased amylase activity. In contrast, an increased expression of NAC activated the expressions of starch synthesis gene in inferior grains under MD. Therefore, it is MYB30 and NAC that cooperates in source and sink, respectively, to promote carbon reserve remobilization in response to MD. Taken together, genes involved in carbon flow from source to sink are different between rice straws and inferior grains.
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Claims 11
Claim · model-written summary
Moderate soil drying increased straw amylase gene expression.
- Taxon
- rice
Oryza sativat0 - Organ / stage
- strawse0
- Treatment
- MD treatmente0
- Gene
- amylase genese0
- Outcome
- expression of amylase genese0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The expression of amylase genes and amylase activity was enhanced by MD treatment in straws”
t0“source to sink in rice in response to soil drying”
Claim · model-written summary
Moderate soil drying increased straw amylase activity.
- Taxon
- riceOryza sativat0
- Organ / stage
- strawse0
- Treatment
- MD treatmente0
- Gene
- amylasee0
- Outcome
- amylase activitye0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The expression of amylase genes and amylase activity was enhanced by MD treatment in straws”
t0“source to sink in rice in response to soil drying”
Claim · model-written summary
Moderate soil drying upregulated starch synthesis genes in inferior grains.
- Taxon
- riceOryza sativat0
- Organ / stage
- inferior grainse0
- Treatment
- MD treatmente0
- Gene
- starch synthesis genese0
- Outcome
- starch synthesis genese0
- Direction
- upregulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In inferior grains, it was starch synthesis genes that were upregulated by MD treatment.”
t0“source to sink in rice in response to soil drying”
Claim · model-written summary
ABA increased in rice straws under soil drying.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an elevated ABA was found in both straws and inferior grains”
t0“source to sink in rice in response to soil drying”
t1“in response to soil drying during grain filling”
Claim · model-written summary
ABA increased in inferior grains under soil drying.
- Taxon
- riceOryza sativat0
- Organ / stage
- inferior grainse0
- Treatment
- soil dryingt1
- Outcome
- ABAe0
- Direction
- elevatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an elevated ABA was found in both straws and inferior grains”
t0“source to sink in rice in response to soil drying”
t1“in response to soil drying during grain filling”
Claim · model-written summary
Soil drying increased NCED1 expression.
- Taxon
- riceOryza sativat0
- Treatment
- MD treatmente0
- Gene
- NCED1e0
- Outcome
- expression of NCED1e0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an increased expression of NCED1 and downregulation of ABA8OX2 by MD treatment”
t0“source to sink in rice in response to soil drying”
Claim · model-written summary
Soil drying downregulated ABA8OX2.
- Taxon
- riceOryza sativat0
- Treatment
- MD treatmente0
- Gene
- ABA8OX2e0
- Outcome
- ABA8OX2e0
- Direction
- downregulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“downregulation of ABA8OX2 by MD treatment”
t0“source to sink in rice in response to soil drying”
Claim · model-written summary
Soil drying reduced MYB30 expression in straws.
- Taxon
- riceOryza sativat0
- Organ / stage
- strawse0
- Treatment
- MDe0
- Gene
- MYB30e0
- Outcome
- expression of MYB30e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the expression of MYB30, a transcription factor (TF) that negatively regulates beta‐amylase genes, was reduced in straws by MD”
t0“source to sink in rice in response to soil drying”
Claim · model-written summary
Reduced MYB30 was linked to increased straw amylase activity.
- Taxon
- riceOryza sativat0
- Gene
- MYB30t1
- Outcome
- amylase activitye0
- Qualifier
- resulting in an increased amylase activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was reduced in straws by MD, resulting in an increased amylase activity.”
t0“source to sink in rice in response to soil drying”
t1“the expression of MYB30”
Claim · model-written summary
Increased NAC expression activated starch synthesis gene expression in inferior grains.
- Taxon
- riceOryza sativat0
- Organ / stage
- inferior grainse0
- Gene
- NACe0
- Outcome
- expressions of starch synthesis genee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an increased expression of NAC activated the expressions of starch synthesis gene in inferior grains under MD.”
t0“source to sink in rice in response to soil drying”
Claim · model-written summary
Authors infer MYB30 and NAC jointly promote source-to-sink carbon remobilization under drying.
- Taxon
- riceOryza sativat0
- Treatment
- MDe0
- Gene
- MYB30 and NACe0
- Outcome
- carbon reserve remobilizatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MYB30 and NAC that cooperates in source and sink, respectively, to promote carbon reserve remobilization in response to MD.”
t0“source to sink in rice in response to soil drying”
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