Abstract
The mobilization and translocation of carbohydrates and mineral nutrients from vegetative plant parts to grains are pivotal for grain filling, often involving a whole plant senescence process. Loss of greenness is a hallmark of leaf senescence. However, the relationship between crop yield and senescence has been controversial for many years. Here, in this study, the overexpression and RNA interference lines of gene of OsNYC3 (Non-Yellow Coloring 3), a chlorophyll catabolism gene, were investigated. Furthermore, exogenous phytohormones were applied, and a treatment of alternate wetting and moderate drying (AWMD) was introduced to regulate the processes of leaf senescence. The results indicated that the delayed senescence of the “STAY-GREEN” trait of rice is undesirable for the process of grain filling, and it would cause a lower ratio of grain filling and lower grain weight of inferior grains, because of unused assimilates in the stems and leaves. Through the overexpression of OsNYC3, application of exogenous chemicals of abscisic acid (ABA), and water management of AWMD, leaf photosynthesis was less influenced, a high ratio of carbohydrate assimilates was partitioned to grains other than leaves and stems as labeled by 13C, grain filling was improved, especially for inferior spikelets, and activities of starch-synthesizing enzymes were enhanced. However, application of ethephon not only accelerated leaf senescence, but also caused seed abortion and grain weight reduction. Thus, plant senescence needs to be finely adjusted in order to make a contribution to crop productivity.
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Claims 8
Claim · model-written summary
Delayed stay-green senescence lowered filling ratio and inferior grain weight because assimilates remained in stems and leaves.
- Taxon
- rice
Oryza sativae0 - Outcome
- ratio of grain fillinge0
- Direction
- lowere0
- Qualifier
- unused assimilates in the stems and leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results indicated that the delayed senescence of the “STAY-GREEN” trait of rice is undesirable for the process of grain filling, and it would cause a lower ratio of grain filling and lower grain weight of inferior grains, because of unused assimilates in the stems and leaves.”
Claim · model-written summary
Delayed stay-green senescence lowered inferior grain weight.
- Taxon
- riceOryza sativae0
- Outcome
- grain weight of inferior grainse0
- Direction
- lowere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results indicated that the delayed senescence of the “STAY-GREEN” trait of rice is undesirable for the process of grain filling, and it would cause a lower ratio of grain filling and lower grain weight of inferior grains, because of unused assimilates in the stems and leaves.”
Claim · model-written summary
OsNYC3 overexpression left leaf photosynthesis less influenced.
- Treatment
- overexpression of OsNYC3e0
- Gene
- OsNYC3e0
- Outcome
- leaf photosynthesise0
- Direction
- less influencede0
Not reportedTaxonComparator
Verbatim
e0“Through the overexpression of OsNYC3, application of exogenous chemicals of abscisic acid (ABA), and water management of AWMD, leaf photosynthesis was less influenced, a high ratio of carbohydrate assimilates was partitioned to grains other than leaves and stems as labeled by 13C, grain filling was improved, especially for inferior spikelets, and activities of starch-synthesizing enzymes were enhanced.”
Claim · model-written summary
ABA application partitioned a high ratio of assimilates to grains.
- Treatment
- application of exogenous chemicals of abscisic acid (ABA)e0
- Outcome
- carbohydrate assimilates was partitioned to grainse0
- Direction
- highe0
- Comparator
- leaves and stemse0
Not reportedTaxon
Verbatim
e0“Through the overexpression of OsNYC3, application of exogenous chemicals of abscisic acid (ABA), and water management of AWMD, leaf photosynthesis was less influenced, a high ratio of carbohydrate assimilates was partitioned to grains other than leaves and stems as labeled by 13C, grain filling was improved, especially for inferior spikelets, and activities of starch-synthesizing enzymes were enhanced.”
Claim · model-written summary
AWMD improved grain filling, especially inferior spikelets.
- Treatment
- water management of AWMDe0
- Outcome
- grain fillinge0
- Direction
- improvede0
- Qualifier
- especially for inferior spikeletse0
Not reportedTaxonComparator
Verbatim
e0“Through the overexpression of OsNYC3, application of exogenous chemicals of abscisic acid (ABA), and water management of AWMD, leaf photosynthesis was less influenced, a high ratio of carbohydrate assimilates was partitioned to grains other than leaves and stems as labeled by 13C, grain filling was improved, especially for inferior spikelets, and activities of starch-synthesizing enzymes were enhanced.”
Claim · model-written summary
Ethephon accelerated leaf senescence.
Not reportedTaxonComparator
Verbatim
e0“However, application of ethephon not only accelerated leaf senescence, but also caused seed abortion and grain weight reduction.”
Claim · model-written summary
Ethephon caused seed abortion.
Not reportedTaxonComparatorDirection
Verbatim
e0“However, application of ethephon not only accelerated leaf senescence, but also caused seed abortion and grain weight reduction.”
Claim · model-written summary
Ethephon reduced grain weight.
Not reportedTaxonComparator
Verbatim
e0“However, application of ethephon not only accelerated leaf senescence, but also caused seed abortion and grain weight reduction.”
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