Abstract
The vapor pressure deficit (VPD) can affect rice growth by affecting water status of the plants and/or thermal conditions of leaves or the canopy. Rice responses to increasing temperatures may also be altered by changes in VPD. We are currently conducting a series of experiments to determine the interactive effects of temperature and VPD on rice growth, but we need to examine genotypic variation in growth responses to VPD to better understand the interaction and it implication for adaptation to climate change. This study aims to determine the genotypic variability in responses to VPD using four varieties that showed different temperature responses in our previous study. We used two naturally-sunlit growth chambers (Climatron) of NIAES, Tsukuba, Japan, setting day/night temperature at 32/22DC for both chambers but different relative humidity (RH) levels; one at 80% (Low VPD9l.74 KPa) and the other at 50% (High VPIY=1.84 KPa). Seedlings of Akihikari, IR64, N22 and Takanari were grown outside until 21 days after sowing (DAS), then moved to the chambers and allowed to grow for 30 days. Growth and physiological responses were determined during the treatment period. Leaf temperature (Tl) measured under the mid-day cloudless conditions at 45 DAS with infra-red thermometers (Konica-Minolta, TA-0510) was significantly higher in low VPD than in high VPD (P<O.OOI), but the difference in Tl between the treatments was larger in Akihikari and N22 (3 DC) than in IR64 and Takanari (1.4 ·C), resulting in a highly significant interaction between genotype and VPD (P<O.OOI). Interestingly, genotypic variation in Tl was small under high VPD, but was noted in low VPD. The reason for the VPD x genotype interaction was not clear, but this suggests that under humid conditions, Tl of Akihikari and N22 may become higher than that of other varieties even under the same air temperature. VPD also had significant effects on growth parameters: the high VPD treatment significantly enhanced tiller production (P<O.OOI) without significant interaction with genotypes. On the other hand, leaf area and plant height were significantly reduced by high VPD (P<O.OOI), but this effect appeared different between genotypes. The reduction in the leaf area was about 50 % in Akihikari and N22 but was about 30% in IR64 and Takanari, resulting in a significant VPD x genotype interaction (P<O.OOI). A similar interaction was observed for plant height and specific leaf area We are currently determining associations amongst growth and physiological parameters observed under different VPD conditions. In the meantime, a series of experiments are on-going to determine the combined effects of temperature and VPD on growth of these contrasting genotypes. (Texte intégral)
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Claims 14
Claim · model-written summary
Leaf temperature was significantly higher under low than high VPD.
- Taxon
- rice
Oryza sativat0 - Treatment
- low VPDe0
- Outcome
- Leaf temperaturee0
- Direction
- highere0
- Comparator
- high VPDe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf temperature (Tl) measured under the mid-day cloudless conditions at 45 DAS with infra-red thermometers (Konica-Minolta, TA-0510) was significantly higher in low VPD than in high VPD (P<O.OOI), but the difference in Tl between the treatments was larger in Akihikari and N22 (3 DC) than in IR64 and Takanari (1.4 ·C), resulting in a highly significant interaction between genotype and VPD (P<O.OOI).”
t0“rice”
Claim · model-written summary
Akihikari had a leaf-temperature difference of 3 DC between VPD treatments.
- Taxon
- riceOryza sativat0
- Material
- Akihikarie0
- Treatment
- low VPDe0
- Outcome
- Tle0
- Direction
- largere0
- Value
- 3 DCe0
- Comparator
- high VPDe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf temperature (Tl) measured under the mid-day cloudless conditions at 45 DAS with infra-red thermometers (Konica-Minolta, TA-0510) was significantly higher in low VPD than in high VPD (P<O.OOI), but the difference in Tl between the treatments was larger in Akihikari and N22 (3 DC) than in IR64 and Takanari (1.4 ·C), resulting in a highly significant interaction between genotype and VPD (P<O.OOI).”
t0“rice”
Claim · model-written summary
N22 had a leaf-temperature difference of 3 DC between VPD treatments.
- Taxon
- riceOryza sativat0
- Material
- N22e0
- Treatment
- low VPDe0
- Outcome
- Tle0
- Direction
- largere0
- Value
- 3 DCe0
- Comparator
- high VPDe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf temperature (Tl) measured under the mid-day cloudless conditions at 45 DAS with infra-red thermometers (Konica-Minolta, TA-0510) was significantly higher in low VPD than in high VPD (P<O.OOI), but the difference in Tl between the treatments was larger in Akihikari and N22 (3 DC) than in IR64 and Takanari (1.4 ·C), resulting in a highly significant interaction between genotype and VPD (P<O.OOI).”
t0“rice”
Claim · model-written summary
IR64 had a leaf-temperature difference of 1.4 ·C between VPD treatments.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf temperature (Tl) measured under the mid-day cloudless conditions at 45 DAS with infra-red thermometers (Konica-Minolta, TA-0510) was significantly higher in low VPD than in high VPD (P<O.OOI), but the difference in Tl between the treatments was larger in Akihikari and N22 (3 DC) than in IR64 and Takanari (1.4 ·C), resulting in a highly significant interaction between genotype and VPD (P<O.OOI).”
t0“rice”
Claim · model-written summary
Takanari had a leaf-temperature difference of 1.4 ·C between VPD treatments.
- Taxon
- riceOryza sativat0
- Material
- Takanarie0
- Treatment
- low VPDe0
- Outcome
- Tle0
- Value
- 1.4 ·Ce0
- Comparator
- high VPDe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf temperature (Tl) measured under the mid-day cloudless conditions at 45 DAS with infra-red thermometers (Konica-Minolta, TA-0510) was significantly higher in low VPD than in high VPD (P<O.OOI), but the difference in Tl between the treatments was larger in Akihikari and N22 (3 DC) than in IR64 and Takanari (1.4 ·C), resulting in a highly significant interaction between genotype and VPD (P<O.OOI).”
t0“rice”
Claim · model-written summary
Genotypic variation in leaf temperature was small under high VPD.
- Taxon
- riceOryza sativat0
- Outcome
- genotypic variation in Tle0
- Qualifier
- high VPDe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Interestingly, genotypic variation in Tl was small under high VPD, but was noted in low VPD.”
t0“rice”
Claim · model-written summary
Genotypic variation in leaf temperature was observed under low VPD.
- Taxon
- riceOryza sativat0
- Outcome
- genotypic variation in Tle0
- Qualifier
- low VPDe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Interestingly, genotypic variation in Tl was small under high VPD, but was noted in low VPD.”
t0“rice”
Claim · model-written summary
High VPD significantly enhanced rice tiller production without a significant genotype interaction.
- Taxon
- riceOryza sativat0
- Treatment
- high VPD treatmente0
- Outcome
- tiller productione0
- Direction
- enhancede0
- Qualifier
- without significant interaction with genotypese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“VPD also had significant effects on growth parameters: the high VPD treatment significantly enhanced tiller production (P<O.OOI) without significant interaction with genotypes.”
t0“rice”
Claim · model-written summary
High VPD significantly reduced rice leaf area and plant height, with genotype differences.
- Taxon
- riceOryza sativat0
- Treatment
- high VPDe0
- Outcome
- leaf area and plant heighte0
- Direction
- reducede0
- Qualifier
- different between genotypese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On the other hand, leaf area and plant height were significantly reduced by high VPD (P<O.OOI), but this effect appeared different between genotypes.”
t0“rice”
Claim · model-written summary
High VPD reduced leaf area in Akihikari by about 50 %.
- Taxon
- riceOryza sativat0
- Material
- Akihikarie0
- Treatment
- VPDe0
- Outcome
- leaf areae0
- Direction
- reductione0
- Value
- about 50 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduction in the leaf area was about 50 % in Akihikari and N22 but was about 30% in IR64 and Takanari, resulting in a significant VPD x genotype interaction (P<O.OOI).”
t0“rice”
Claim · model-written summary
High VPD reduced leaf area in N22 by about 50 %.
- Taxon
- riceOryza sativat0
- Material
- N22e0
- Treatment
- VPDe0
- Outcome
- leaf areae0
- Direction
- reductione0
- Value
- about 50 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduction in the leaf area was about 50 % in Akihikari and N22 but was about 30% in IR64 and Takanari, resulting in a significant VPD x genotype interaction (P<O.OOI).”
t0“rice”
Claim · model-written summary
High VPD reduced leaf area in IR64 by about 30%.
- Taxon
- riceOryza sativat0
- Material
- IR64e0
- Treatment
- VPDe0
- Outcome
- leaf areae0
- Direction
- reductione0
- Value
- about 30%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduction in the leaf area was about 50 % in Akihikari and N22 but was about 30% in IR64 and Takanari, resulting in a significant VPD x genotype interaction (P<O.OOI).”
t0“rice”
Claim · model-written summary
High VPD reduced leaf area in Takanari by about 30%.
- Taxon
- riceOryza sativat0
- Material
- Takanarie0
- Treatment
- VPDe0
- Outcome
- leaf areae0
- Direction
- reductione0
- Value
- about 30%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The reduction in the leaf area was about 50 % in Akihikari and N22 but was about 30% in IR64 and Takanari, resulting in a significant VPD x genotype interaction (P<O.OOI).”
t0“rice”
Claim · model-written summary
VPD by genotype interactions were also observed for plant height and specific leaf area.
- Taxon
- riceOryza sativat0
- Treatment
- interactione0
- Outcome
- plant height and specific leaf areae0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A similar interaction was observed for plant height and specific leaf area”
t0“rice”
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