Abstract
Aerobic rice technology is still new in Malaysia, and information regarding MARDI Aerob 1 (MA1), the first local aerobic rice variety, is still lacking. Therefore, comparative studies were carried out to determine the physiological performance of aerobic rice variety MA1 and lowland rice variety MR253 under water stress given at the panicle initiation, flowering and ripening stages. This experiment was arranged in a randomized complete block design. Stomatal conductance (gs), chlorophyll a fluorescence (Fv/Fm), leaf relative water content (leaf RWC), and soil moisture content (SMC) as well as yield component parameters such as panicle number, grain yield and 100-grain weight were measured. Results revealed that gs and leaf RWC for both varieties decreased with depletion of SMC. The correlation study between the physiological parameters and SMC indicated that Fv/Fm was not affected by water stress, regardless of varieties. The yield components (panicle number, grain yield and 100-grain weight) for both varieties greatly decreased when water stress was imposed at the panicle initiation stage. This study showed that the panicle initiation period was the most sensitive stage to water stress that contributed to a substantial reduction in yield for both varieties. Under the aerobic condition (control), MR253 produced higher panicle number, 100-grain weight and yield than MA1. Although MR253 is bred for lowland, it is well adapted to aerobic condition.
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Claims 11
Claim · model-written summary
Stomatal conductance decreased as soil moisture declined in both varieties.
- Taxon
- rice
Oryza sativat0 - Material
- both varietiese0
- Treatment
- depletion of SMCe0
- Outcome
- gse0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results revealed that gs and leaf RWC for both varieties decreased with depletion of SMC.”
t0“Aerobic and Lowland Rice”
Claim · model-written summary
Leaf relative water content decreased as soil moisture declined in both varieties.
- Taxon
- riceOryza sativat0
- Material
- both varietiese0
- Treatment
- depletion of SMCe0
- Outcome
- leaf RWCe0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Results revealed that gs and leaf RWC for both varieties decreased with depletion of SMC.”
t0“Aerobic and Lowland Rice”
Claim · model-written summary
Fv/Fm was not affected by water stress in either variety.
- Taxon
- riceOryza sativat0
- Treatment
- water stresse0
- Outcome
- Fv/Fme0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fv/Fm was not affected by water stress, regardless of varieties.”
t0“Aerobic and Lowland Rice”
Claim · model-written summary
Water stress at panicle initiation greatly decreased panicle number in both varieties.
- Taxon
- riceOryza sativat0
- Organ / stage
- panicle initiation stagee0
- Treatment
- water stresse0
- Outcome
- panicle numbere0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield components (panicle number, grain yield and 100-grain weight) for both varieties greatly decreased when water stress was imposed at the panicle initiation stage.”
t0“Aerobic and Lowland Rice”
Claim · model-written summary
Water stress at panicle initiation greatly decreased grain yield in both varieties.
- Taxon
- riceOryza sativat0
- Organ / stage
- panicle initiation stagee0
- Treatment
- water stresse0
- Outcome
- grain yielde0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield components (panicle number, grain yield and 100-grain weight) for both varieties greatly decreased when water stress was imposed at the panicle initiation stage.”
t0“Aerobic and Lowland Rice”
Claim · model-written summary
Water stress at panicle initiation greatly decreased 100-grain weight in both varieties.
- Taxon
- riceOryza sativat0
- Organ / stage
- panicle initiation stagee0
- Treatment
- water stresse0
- Outcome
- 100-grain weighte0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield components (panicle number, grain yield and 100-grain weight) for both varieties greatly decreased when water stress was imposed at the panicle initiation stage.”
t0“Aerobic and Lowland Rice”
Claim · model-written summary
Panicle initiation was the most water-stress-sensitive stage for yield in both varieties.
- Taxon
- riceOryza sativat0
- Organ / stage
- panicle initiation periode0
- Outcome
- most sensitive stage to water stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the panicle initiation period was the most sensitive stage to water stress that contributed to a substantial reduction in yield for both varieties.”
t0“Aerobic and Lowland Rice”
Claim · model-written summary
MR253 had more panicles than MA1 under aerobic control conditions.
- Taxon
- riceOryza sativat0
- Material
- MR253e0
- Treatment
- aerobic condition (control)e0
- Outcome
- panicle numbere0
- Direction
- highere0
- Comparator
- MA1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under the aerobic condition (control), MR253 produced higher panicle number, 100-grain weight and yield than MA1.”
t0“Aerobic and Lowland Rice”
Claim · model-written summary
MR253 had higher 100-grain weight than MA1 under aerobic control conditions.
- Taxon
- riceOryza sativat0
- Material
- MR253e0
- Treatment
- aerobic condition (control)e0
- Outcome
- 100-grain weighte0
- Direction
- highere0
- Comparator
- MA1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under the aerobic condition (control), MR253 produced higher panicle number, 100-grain weight and yield than MA1.”
t0“Aerobic and Lowland Rice”
Claim · model-written summary
MR253 yielded more than MA1 under aerobic control conditions.
- Taxon
- riceOryza sativat0
- Material
- MR253e0
- Treatment
- aerobic condition (control)e0
- Outcome
- yielde0
- Direction
- highere0
- Comparator
- MA1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under the aerobic condition (control), MR253 produced higher panicle number, 100-grain weight and yield than MA1.”
t0“Aerobic and Lowland Rice”
Claim · model-written summary
MR253 was well adapted to aerobic conditions.
- Taxon
- riceOryza sativat0
- Material
- MR253e0
- Outcome
- well adapted to aerobic conditione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although MR253 is bred for lowland, it is well adapted to aerobic condition.”
t0“Aerobic and Lowland Rice”
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