A portable reflectance-absorptance-transmittance meter for photosynthetic work on vascular plant leaves

Title:

A portable reflectance-absorptance-transmittance meter for photosynthetic work on vascular plant leaves

Creator:

Ritchie, R. J. and Runcie, J. W.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:11f1e2dd-4522-4667-86ff-b581c1b20d82
uuid:11f1e2dd-4522-4667-86ff-b581c1b20d82
issn:0300-3604
doi:10.1007/s11099-014-0069-y

Subject:

fotosyntéza, photosynthesis, absorptance, electron transport rate, integrating sphere, leaf absorptance factor, PAM fluorometry, reflectance, 2, and 581

Type:

model:article and TEXT

Format:

print, bez média, and svazek

Description:

PAM (pulse amplitude modulation) fluorometers can be used to estimate the electron transport rate (ETR) [μmol(e-) m-2 s-1] from photosynthetic yield determinations, provided the absorptance (Abtλ) of the photoorganism is known. The standard assumed value used for absorptance is 0.84 (leaf absorptance factor, AbtF). We described a reflectance-absorptancetransmittance (RAT) meter for routine experimental measurements of the actual absorptance of leaves. The RAT uses a red-green-blue (RGB) LED diode light source to measure absorptances at wavelengths suitable for use with PAM fluorometers and infrared gas analysers. Results using the RAT were compared to Abtλ spectra using a Taylor integrating sphere on bird’s nest fern (Asplenium nidus), banana, Doryanthes excelsa, Kalanchoe daigremontiana, and sugarcane. Parallel venation had no significant effect upon Abt465 in banana, Doryanthes, a Dendrobium orchid, pineapple, and sugarcane, but there was a slight difference in the case of the fern A. nidus. The average Abt465 (approximately 0.96) and Abt625 (approximately 0.89) were approximately 14% and 6% higher than the standard value (AbtF = 0.84). The PAR-range Abt400-700 was only approximately 5% higher than the standard value (approximately 0.88) based on averaged absorptance from the blue, green, and red light data and from where the RGB-diode was used as a ‘white’ light source. In some species, absorptances at blue and red wavelengths are quite different (e.g. water lily). Reflectance measurements of leaves using the RAT would also be useful for remote sensing studies., R. J. Ritchie, J. W. Runcie., and Obsahuje bibliografii

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

614-626

Source:

Photosynthetica | 2014 Volume:52 | Number:4

Harvested from:

CDK

Metadata only:

false