A Theoretical Model Research of Rice Water Stress Index Based on Automated Infrared Thermal Imaging

Cao, Ming Chao; Zhang, Wen Zhong; Han, Ya Dong; Chen, Yao; Wang, Yi Tao; Ding, Guo Hua

doi:10.4028/www.scientific.net/amr.712-715.433

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…Keeping the CWSI between the critical points for Tr decline and for Pn decline was an ideal for higher leaf water use efficiency. The significant negative correlations between CWSI at 14:00 and relative soil moisture contents (θ/θs) were same with the results reported in previous studies (Wang et al, 2005;Paltineanu et al, 2009;Paltineanu et al, 2012;Cao et al, 2013). In present study, we also found slight differences between the correlations based on data measured under different VPD conditions.…”

Section: Discussionsupporting

confidence: 80%

“…Thus, water deficit diagnosis method based on canopy thermal image is seldom reported in paddy rice. Cao et al (2013) reported the use of infrared thermal imaging technology (Fluke Ti-125 infrared camera) in reflecting the rice water status. With increasing water scarcity, water saving irrigation (WSI) techniques are widely used in rice paddies (Belder et al, 2004;Uphoff et al, 2010;Abbasi and Sepaskhah, 2011;Kato et al, 2011) exposing rice plants to a certain degree of water deficit.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Diagnosing Crop Water Stress of Rice using Infra-red Thermal Imager under Water Deficit Condition

Xu¹,

YuPing²,

Liu³

et al. 2016

IJAB

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A thermal imager was used for measuring the canopy temperature to calculate crop water stress index (CWSI) of rice under water deficit condition. The CWSI varied diurnally with peaks appeared at noon, and soil water deficit led to higher CWSI values during noon. Transpiration rate (Tr), stomatal conductance (gs) and net photosynthetic rate (Pn) were high at low CWSI, and reduced with increasing CWSI. The relationship between CWSI and Pn, Tr or gs at noon was described by quadratic polynomial equations. At critical noon, CWSI values for the decline trend in Pn (0.303, 0.385 and 0.446 at tillering, panicle initiation to booting, milk to soft dough stage) were higher than for decline in Tr and gs. Assuming a 5% reduction in Pn from maximum is moderate water deficit, the critical CWSI values were 0.420, 0.472 and 0.536 at tillering, panicle initiation to booting and milk to soft dough stages. CWSI at 14:00 decreased significantly with increasing relative soil moisture contents. There was a slight difference between the linear relations under different vapor pressure deficit (VPD) conditions. The critical relative soil moisture contents for a 5% reduction in Pn were 1.57%, 1.18% and 1.27% higher under high VPD than low VPD conditions. It implied that rice water status was determined in conjunction with field soil moisture content and air aridity. The water deficit diagnosis based on canopy temperature tracked by thermal infrared imager is a promising method in reflecting the conjuncted function of soil moisture deficit and air aridity on crop water status.

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Section: Discussionsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Diagnosing Crop Water Stress of Rice using Infra-red Thermal Imager under Water Deficit Condition

Xu¹,

YuPing²,

Liu³

et al. 2016

IJAB

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show abstract

“…An alternative approach for assessing stomata conductance is the infrared (IR) thermography in leaves. The leaf surface temperature correlates well with estimates of stomata conductance [50,51] and consequently with leaf water status [52]. Thus, we measured the leaf surface temperature in Nipp and APX7i plants under control conditions, moderate drought stress (2 days water withholding), and severe drought stress (7 days water withholding).…”

Section: Osapx7 Silencing Leads To a Decrease In Leaf Surface Tempera...mentioning

confidence: 94%

Stromal Ascorbate Peroxidase (OsAPX7) Modulates Drought Stress Tolerance in Rice (Oryza sativa)

et al. 2023

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Chloroplast ascorbate peroxidases exert an important role in the maintenance of hydrogen peroxide levels in chloroplasts by using ascorbate as the specific electron donor. In this work, we performed a functional study of the stromal APX in rice (OsAPX7) and demonstrated that silencing of OsAPX7 did not impact plant growth, redox state, or photosynthesis parameters. Nevertheless, when subjected to drought stress, silenced plants (APX7i) show a higher capacity to maintain stomata aperture and photosynthesis performance, resulting in a higher tolerance when compared to non-transformed plants. RNA-seq analyses indicate that the silencing of OsAPX7 did not lead to changes in the global expression of genes related to reactive oxygen species metabolism. In addition, the drought-mediated induction of several genes related to the proteasome pathway and the down-regulation of genes related to nitrogen and carotenoid metabolism was impaired in APX7i plants. During drought stress, APX7i showed an up-regulation of genes encoding flavonoid and tyrosine metabolism enzymes and a down-regulation of genes related to phytohormones signal transduction and nicotinate and nicotinamide metabolism. Our results demonstrate that OsAPX7 might be involved in signaling transduction pathways related to drought stress response, contributing to the understanding of the physiological role of chloroplast APX isoforms in rice.

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Thylakoidal APX modulates hydrogen peroxide content and stomatal closure in rice (Oryza sativa L.)

Jardim-Messeder

Caverzan

Rauber

et al. 2018

Environmental and Experimental Botany

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A Theoretical Model Research of Rice Water Stress Index Based on Automated Infrared Thermal Imaging

Cited by 3 publications

References 15 publications

Diagnosing Crop Water Stress of Rice using Infra-red Thermal Imager under Water Deficit Condition

Diagnosing Crop Water Stress of Rice using Infra-red Thermal Imager under Water Deficit Condition

Stromal Ascorbate Peroxidase (OsAPX7) Modulates Drought Stress Tolerance in Rice (Oryza sativa)

Thylakoidal APX modulates hydrogen peroxide content and stomatal closure in rice (Oryza sativa L.)

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