Evaluation of the grain yield and nitrogen nutrient status of wheat ( Triticum aestivum L.) using thermal imaging

Guo, Jiuxin; Tian, Guangli; Zhou, Yi; Wang, Min; Ling, Ning; Guo, Shiwei

doi:10.1016/j.fcr.2016.08.008

Cited by 33 publications

(19 citation statements)

References 59 publications

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“…A different increase in Tr was observed under high-N supply in the four varieties ( Figure 1 ). Under high-N supply, the increase in Tr aimed to (1) cool down the plants as it was shown that there was low leaf temperature in plants supplied with high-N [ 36 ] and the low temperature correlated with high Tr [ 37 ]; (2) absorb more N; and (3) fix more carbon (C). In the soil–plant–atmosphere continuum, water goes uphill based on the root pressure and transpiration pull.…”

Section: Discussionmentioning

confidence: 99%

Aquaporin Expression and Water Transport Pathways inside Leaves Are Affected by Nitrogen Supply through Transpiration in Rice Plants

Ding¹,

Li²,

Gao³

et al. 2018

IJMS

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The photosynthetic rate increases under high-N supply, resulting in a large CO2 transport conductance in mesophyll cells. It is less known that water movement is affected by nitrogen supply in leaves. This study investigated whether the expression of aquaporin and water transport were affected by low-N (0.7 mM) and high-N (7 mM) concentrations in the hydroponic culture of four rice varieties: (1) Shanyou 63 (SY63), a hybrid variant of the indica species; (2) Yangdao 6 (YD6), a variant of indica species; (3) Zhendao 11 (ZD11), a hybrid variant of japonica species; and (4) Jiuyou 418 (JY418), another hybrid of the japonica species. Both the photosynthetic and transpiration rate were increased by the high-N supply in the four varieties. The expressions of aquaporins, plasma membrane intrinsic proteins (PIPs), and tonoplast membrane intrinsic protein (TIP) were higher in high-N than low-N leaves, except in SY63. Leaf hydraulic conductance (Kleaf) was lower in high-N than low-N leaves in SY63, while Kleaf increased under high-N supply in the YD6 variant. Negative correlations were observed between the expression of aquaporin and the transpiration rate in different varieties. Moreover, there was a significant negative correlation between transpiration rate and intercellular air space. In conclusion, the change in expression of aquaporins could affect Kleaf and transpiration. A feedback effect of transpiration would regulate aquaporin expression. The present results imply a coordination of gas exchange with leaf hydraulic conductance.

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Section: Discussionmentioning

confidence: 99%

Aquaporin Expression and Water Transport Pathways inside Leaves Are Affected by Nitrogen Supply through Transpiration in Rice Plants

Ding¹,

Li²,

Gao³

et al. 2018

IJMS

Self Cite

View full text Add to dashboard Cite

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“…Recently, the price of an infrared thermal camera has decreased, and an inexpensive model is available at less than 500 USD. To date, thermal imaging has been applied for evaluation not only of plant growth and drought stress, but also that of nutrient status and disease infection (Guo et al, 2016;Stoll, Schultz & Berkelmann-Loehnertz, 2008).…”

Section: Introductionmentioning

confidence: 99%

A new indicator of leaf stomatal conductance based on thermal imaging for field grown cowpea

Iseki

Olaleye

2019

Plant Production Science

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Compared with a porometer, a thermal camera can be easily applied to large plant populations comprising a set of varieties, treatments, and replications, whereby, leaf temperature-based indicators are widely used to estimate stomatal conductance (g s); however, a major difficulty in applying these indicators is their vulnerability to meteorological conditions. In this study, a new indicator of g s (GsI) was developed with a modified theoretical equation of g s that was highly simplified by means of several assumptions. GsI calculation uses leaf and air temperature, relative humidity, and solar radiation measurements. To validate and compare GsI values with other thermal indicators as leaf-air temperature difference and crop water stress index, glasshouse and field experiments were conducted. Leaf temperature of cowpea plants was measured using a low-cost thermal camera to ensure a cost-friendly method. GsI proved to be more stable than other indicators, relative to the measured g s , irrespective of solar radiation, air temperature, and relative humidity conditions. As no reference temperature is needed for the calculation of GsI, it easily applies to large plant populations, although the GsI is most accurate in the range from moderate to high g s values (approximately, >0.2 mol m −2 s −1). We used GsI to evaluate a cowpea germplasm collection consisting of 248 accessions, and elucidated that most accessions with higher GsI, which expected to have higher g s , are originated in West-Africa. As GsI is available regardless of varying meteorological conditions, it is a useful indicator of g s , especially in field studies involving multilocation and time-course evaluations.

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“…Thermal images are useful for various purposes, including for detecting the presence of humans by measuring body surface temperatures [ 1 , 2 ] and performing noninvasive measurement in agriculture [ 2 , 3 , 4 ]. Because the wavelength of long-wavelength infrared (LWIR) light captured by thermal cameras is approximately 10 times longer than that of visible light captured by conventional color cameras, thermal imagers generally have a smaller number of pixels than color imagers.…”

Section: Introductionmentioning

confidence: 99%

Coaxiality Evaluation of Coaxial Imaging System with Concentric Silicon–Glass Hybrid Lens for Thermal and Color Imaging

Takahata

2020

Sensors

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Thermal imaging is useful for tasks such as detecting the presence of humans and recognizing surrounding objects in the operation of several types of robots, including service robots and personal mobility robots, which assist humans. Because the number of pixels on a thermal imager is generally smaller than that on a color imager, thermal images are more useful when combined with color images, assuming that the correspondence between points in the images captured by the two sensors is known. In the literature, several types of coaxial imaging systems have been reported that can capture thermal and color images, simultaneously, from the same point of view with the same optical axis. Among them, a coaxial imaging system using a concentric silicon–glass hybrid lens was devised. Long-wavelength infrared and visible light was focused using the hybrid lens. The focused light was subsequently split using a silicon plate. Separate thermal and color images were then captured using thermal and color imagers, respectively. However, a coaxiality evaluation of the hybrid lens has not been shown. This report proposes an implementation and coaxiality evaluation for a compact coaxial imaging system incorporating the hybrid lens. The coaxiality of the system was experimentally demonstrated by estimating the intrinsic and extrinsic parameters of the thermal and color imagers and performing 2D mapping between the thermal images and color images.

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Evaluation of the grain yield and nitrogen nutrient status of wheat ( Triticum aestivum L.) using thermal imaging

Cited by 33 publications

References 59 publications

Aquaporin Expression and Water Transport Pathways inside Leaves Are Affected by Nitrogen Supply through Transpiration in Rice Plants

Aquaporin Expression and Water Transport Pathways inside Leaves Are Affected by Nitrogen Supply through Transpiration in Rice Plants

A new indicator of leaf stomatal conductance based on thermal imaging for field grown cowpea

Coaxiality Evaluation of Coaxial Imaging System with Concentric Silicon–Glass Hybrid Lens for Thermal and Color Imaging

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