Geoprocessamento E Sensoriamento Remoto Aplicado Na Determinação Do Uso Da Terra Numa Microbacia

Campos, Sérgio; Gonçalves, Shahine Paccola; Silva, Mariana Garcia Da; Barbosa, Ana Paula; Rodrigues, Flávia Mazzer; Pissarra, Teresa Cristina Tarlé; Lopes, Laura Rocha De Castro

doi:10.22533/at.ed.9631919114

Cited by 1 publication

(1 citation statement)

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“…We positioned the sensor at a 5 cm vertical distance and used a Spectralon plate, as it is closest to a Lambertian surface, that is, an ideal surface that reflects all incident radiation. Specifically, the spectral range between 1300 and 2500 nm is more strongly characterized by light absorption in the presence of water, so the study in this range required a suitably prepared environment (Campelo, 2018), with regular acquisition geometry in all readings and under a single light source. We used a 50 W halogen lamp as a light source, with the beam collimated to the plane, forming a zenith angle of 30 degrees.…”

Section: Methodsmentioning

confidence: 99%

The multiple roles of trichomes in two Croton species

Araújo,

Souza,

Carvalho

et al. 2024

Plant Cell & Environment

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Trichomes are common in plants from dry environments, and despite their recognized role in protection and defense, little is known about their role as absorptive structures and in other aspects of leaf ecophysiology. We combine anatomical and ecophysiological data to evaluate how trichomes affect leaf gas exchange and water balance during drought. We studied two congeneric species with pubescent leaves which co‐occur in Brazilian Caatinga: Croton blanchetianus (dense trichomes) and Croton adenocalyx (sparse trichomes). We found a novel foliar water uptake (FWU) pathway in C. blanchetianus composed of stellate trichomes and underlying epidermal cells and sclereids that interconnect the trichomes from both leaf surfaces. The water absorbed by these trichomes is redistributed laterally by pectin protuberances on mesophyll cell walls. This mechanism enables C. blanchetianus leaves to absorb water more efficiently than C. adenocalyx. Consequently, the exposure of C. blanchetianus to dew during drought improved its leaf gas exchange and water status more than C. adenocalyx. C. blanchetianus trichomes also increase their leaf capacity to reflect light and maintain lower temperatures during drought. Our results emphasize the multiple roles that trichomes might have on plant functioning and the importance of FWU for the ecophysiology of Caatinga plants during drought.

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Section: Methodsmentioning

confidence: 99%