Abstract
Abstract The atmospheric CO 2 enrichment can seriously affect rice root growth. Alternate wetting and drying (AWD) irrigation, which can also increase root growth, is a widely promoted water‐saving technology for future climate, yet how elevated CO 2 (eCO 2 ) influences rice root growth under AWD remains unclear. In the present study, we examined the root growth of Yangdao 6 (YD 6) and Koshihikari (KOS) cultured under different water irrigation regimes (well‐watered and AWD) and CO 2 concentration (400 and 800 ppm). AWD reduced shoot dry weight of KOS compared with WW under ambient CO 2 (400 ppm, aCO 2 ), while the shoot dry weight of KOS showed no difference between WW and AWD treatments under eCO 2 . Additional, under aCO 2 , AWD did not affect the exhibited similar root dry weight, length, total surface area, and volume of YD 6 and KOS relative to WW. However, under eCO 2 , AWD significantly promoted the root dry weight, root length, total root surface area, and root volume of YD 6 and KOS. Furthermore, root ABA content of YD 6 and KOS was significantly higher under AWD than under WW. Then, the OsNCED3 (a key gene for ABA biosynthesis) RNAi lines were used to check the role of ABA in root growth under eCO 2 with AWD conditions. The results showed that AWD increased the ABA content and root parameters of WT but not the OsNCED3 RNAi lines under eCO 2 . Overall, the results suggest that eCO 2 can improve rice root growth under AWD by involving root ABA, which contributes to the understanding of water‐saving irrigation on rice in the future climate.
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Claims 8
Claim · model-written summary
AWD reduced Koshihikari shoot dry weight relative to well-watered conditions at ambient CO2.
- Taxon
- rice
Oryza sativat0 - Material
- KOSe0
- Treatment
- AWDe0
- Outcome
- shoot dry weighte0
- Direction
- reducede0
- Qualifier
- ambient CO 2 (400 ppm, aCO 2 )e0
- Comparator
- WWe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“AWD reduced shoot dry weight of KOS compared with WW under ambient CO 2 (400 ppm, aCO 2 )”
t0“rice”
Claim · model-written summary
Koshihikari shoot dry weight did not differ between AWD and well-watered treatments under elevated CO2.
- Taxon
- riceOryza sativat0
- Material
- KOSe0
- Treatment
- AWD treatmentse0
- Outcome
- shoot dry weighte0
- Direction
- no differencee0
- Qualifier
- eCO 2e0
- Comparator
- WWe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the shoot dry weight of KOS showed no difference between WW and AWD treatments under eCO 2”
t0“rice”
Claim · model-written summary
At ambient CO2, AWD did not affect root dry weight, length, surface area, or volume in either cultivar relative to well-watered conditions.
- Taxon
- riceOryza sativat0
- Material
- YD 6 and KOSe0
- Treatment
- AWDe0
- Outcome
- root dry weight, length, total surface area, and volumee0
- Direction
- did not affecte0
- Qualifier
- under aCO 2e0
- Comparator
- WWe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under aCO 2 , AWD did not affect the exhibited similar root dry weight, length, total surface area, and volume of YD 6 and KOS relative to WW”
t0“rice”
Claim · model-written summary
Under elevated CO2, AWD significantly increased root dry weight, length, surface area, and volume in both cultivars.
- Taxon
- riceOryza sativat0
- Material
- YD 6 and KOSe0
- Treatment
- AWDe0
- Outcome
- root dry weight, root length, total root surface area, and root volumee0
- Direction
- promotede0
- Qualifier
- under eCO 2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under eCO 2 , AWD significantly promoted the root dry weight, root length, total root surface area, and root volume of YD 6 and KOS”
t0“rice”
Claim · model-written summary
Root ABA content in both cultivars was significantly higher under AWD than under well-watered conditions.
- Taxon
- riceOryza sativat0
- Material
- YD 6 and KOSe0
- Treatment
- AWDe0
- Outcome
- root ABA contente0
- Direction
- highere0
- Comparator
- WWe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root ABA content of YD 6 and KOS was significantly higher under AWD than under WW”
t0“rice”
Claim · model-written summary
AWD increased ABA content in wild-type plants under elevated CO2.
- Taxon
- riceOryza sativat0
- Material
- WTe0
- Treatment
- AWDe0
- Outcome
- ABA contente0
- Direction
- increasede0
- Qualifier
- under eCO 2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“AWD increased the ABA content and root parameters of WT but not the OsNCED3 RNAi lines under eCO 2”
t0“rice”
Claim · model-written summary
AWD increased root parameters in wild-type plants under elevated CO2.
- Taxon
- riceOryza sativat0
- Material
- WTe0
- Treatment
- AWDe0
- Outcome
- root parameterse0
- Direction
- increasede0
- Qualifier
- under eCO 2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“AWD increased the ABA content and root parameters of WT but not the OsNCED3 RNAi lines under eCO 2”
t0“rice”
Claim · model-written summary
AWD did not increase ABA content or root parameters in OsNCED3 RNAi lines under elevated CO2.
- Taxon
- riceOryza sativat0
- Material
- OsNCED3 RNAi linese0
- Treatment
- AWDe0
- Gene
- OsNCED3e0
- Outcome
- ABA content and root parameterse0
- Qualifier
- under eCO 2e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“AWD increased the ABA content and root parameters of WT but not the OsNCED3 RNAi lines under eCO 2”
t0“rice”
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