Abstract
Nonflooded irrigation is an important water-saving rice cultivation technology, but little is known on its photosynthetic mechanism. The aims of this work were to investigate photosynthetic characteristics of rice during grain filling stage under three nonflooded irrigation treatments: furrow irrigation with plastic mulching (FIM), furrow irrigation with nonmulching (FIN), and drip irrigation with plastic mulching (DI). Compared with the conventional flooding (CF) treatment, those grown in the nonflooded irrigation treatments showed lower net photosynthetic rate (PN), lower maximum quantum yield (Fv/Fm), and lower effective quantum yield of PSII photochemistry (ΦPSII). And the poor photosynthetic characteristics in the nonflooded irrigation treatments were mainly attributed to the low total nitrogen content (TNC). Under non-flooded irrigation, the PN, Fv/Fm, and ΦPSII significantly decreased with a reduction in the soil water potential, but these parameters were rapidly recovered in the DI and FIM treatments when supplementary irrigation was applied. Moreover, The DI treatment always had higher photosynthetic productivity than the FIM and FIN treatments. Grain yield, matter translocation, and dry matter post-anthesis (DMPA) were the highest in the CF treatment, followed by the DI, FIM, and FIN treatments in turn. In conclusion, increasing nitrogen content in leaf of rice plants could be a key factor to improve photosynthetic capacity in nonflooded irrigation.
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Claims 7
Claim · model-written summary
Rice under nonflooded irrigation treatments showed lower net photosynthetic rate, maximum quantum yield and effective quantum yield of PSII than under conventional flooding.
- Taxon
- Rice
Oryza sativat0 - Treatment
- nonflooded irrigation treatmentse0
- Outcome
- net photosynthetic rate (PN), lower maximum quantum yield (Fv/Fm), and lower effective quantum yield of PSII photochemistry (ΦPSII)e0
- Direction
- lowere0
- Comparator
- conventional flooding (CF) treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with the conventional flooding (CF) treatment, those grown in the nonflooded irrigation treatments showed lower net photosynthetic rate (PN), lower maximum quantum yield (Fv/Fm), and lower effective quantum yield of PSII photochemistry (ΦPSII)”
t0“Rice”
Claim · model-written summary
The poor photosynthetic characteristics under nonflooded irrigation were mainly attributed to the low total nitrogen content.
- Taxon
- RiceOryza sativat0
- Treatment
- nonflooded irrigation treatmentse0
- Compound
- total nitrogen contente0
- Outcome
- poor photosynthetic characteristicse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the poor photosynthetic characteristics in the nonflooded irrigation treatments were mainly attributed to the low total nitrogen content (TNC)”
t0“Rice”
Claim · model-written summary
Under non-flooded irrigation, PN, Fv/Fm and ΦPSII decreased significantly with a reduction in soil water potential.
- Taxon
- RiceOryza sativat0
- Treatment
- reduction in the soil water potentiale0
- Outcome
- PN, Fv/Fm, and ΦPSIIe0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under non-flooded irrigation, the PN, Fv/Fm, and ΦPSII significantly decreased with a reduction in the soil water potential”
t0“Rice”
Claim · model-written summary
These photosynthetic parameters rapidly recovered in the DI and FIM treatments when supplementary irrigation was applied.
- Taxon
- RiceOryza sativat0
- Treatment
- supplementary irrigatione0
- Outcome
- these parameterse0
- Direction
- recoverede0
- Qualifier
- DI and FIM treatmentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these parameters were rapidly recovered in the DI and FIM treatments when supplementary irrigation was applied”
t0“Rice”
Claim · model-written summary
The DI treatment always had higher photosynthetic productivity than the FIM and FIN treatments.
- Taxon
- RiceOryza sativat0
- Treatment
- DI treatmente0
- Outcome
- photosynthetic productivitye0
- Direction
- highere0
- Comparator
- FIM and FIN treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The DI treatment always had higher photosynthetic productivity than the FIM and FIN treatments”
t0“Rice”
Claim · model-written summary
Grain yield, matter translocation and dry matter post-anthesis were highest in the CF treatment, followed by DI, FIM and FIN in turn.
- Taxon
- RiceOryza sativat0
- Treatment
- CF treatmente0
- Outcome
- Grain yield, matter translocation, and dry matter post-anthesis (DMPA)e0
- Direction
- higheste0
- Comparator
- DI, FIM, and FIN treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yield, matter translocation, and dry matter post-anthesis (DMPA) were the highest in the CF treatment, followed by the DI, FIM, and FIN treatments in turn”
t0“Rice”
Claim · model-written summary
Increasing nitrogen content in leaves of rice plants could be a key factor for improving photosynthetic capacity under nonflooded irrigation.
- Taxon
- riceOryza sativae0
- Outcome
- photosynthetic capacitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing nitrogen content in leaf of rice plants could be a key factor to improve photosynthetic capacity in nonflooded irrigation”
The same questions in other papers
irrigation · physiology: photosynthesis · Oryza sativa (rice)Positive and negative results
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