Valverdi Nadia A, Acosta Camilla, Dauber Gabriella R, Goldsmith Gregory R, Ávila-Lovera Eleinis
Schmid College of Science and Technology Chapman University Orange California USA.
Estación Experimental Agropecuaria Catamarca, Instituto Nacional de Tecnología Agropecuaria Catamarca - La Rioja Catamarca Argentina.
Appl Plant Sci. 2023 Sep 4;11(6):e11542. doi: 10.1002/aps3.11542. eCollection 2023 Nov-Dec.
A comparison of methods using different materials to exclude light from stems to prevent stem CO exchange (i.e., photosynthesis), without affecting stem conductance to water vapor, surface temperature, and relative humidity, was conducted on stems of avocado trees in California.
The experiment featured three materials: aluminum foil, paper-based wrap, and mineral-based paint. We examined stem CO exchange with and without the light exclusion treatments. We also examined stem surface temperature, relative humidity, and photosynthetic active radiation (PAR) under the cover materials. All materials reduced PAR and stem CO exchange. However, aluminum foil reduced stem surface temperature and increased relative humidity.
Methods used to study stem CO exchange through light exclusion have historically relied on methods that may induce experimental artifacts. Among the methods tested here, mineral-based paint effectively reduced PAR without affecting stem surface temperature and relative humidity around the stem.
在加利福尼亚州鳄梨树的茎上，进行了一项比较使用不同材料来阻挡光线进入茎部以防止茎部二氧化碳交换（即光合作用），同时又不影响茎部水汽导度、表面温度和相对湿度的方法的研究。
该实验采用了三种材料：铝箔、纸质包裹物和矿物基涂料。我们研究了有无遮光处理时茎部的二氧化碳交换情况。我们还研究了覆盖材料下茎部的表面温度、相对湿度和光合有效辐射（PAR）。所有材料都降低了PAR和茎部的二氧化碳交换。然而，铝箔降低了茎部表面温度并增加了相对湿度。
过去用于通过遮光研究茎部二氧化碳交换的方法一直依赖于可能会产生实验假象的方法。在这里测试的方法中，矿物基涂料有效地降低了PAR，同时不影响茎部表面温度和茎部周围的相对湿度。
