Foliar growth and daily behavior of net photosynthesis in fique plants cv Ceniza (Furcraea cabuyaTrelease)
2022
Cadena-Torres Jorge | Barragan Quijano Eduardo | Romero Ferrer Jorge Luis | Mercado Kelly
The present study was carried out to monitor leaf growth, foliar emission, and the daily photosynthesis behavior of sisal plants cv Ceniza. In a commercial crop, sisal plants were selected and monitored weekly to determine increase in number, length, width, and thickness of the leaves, during a 154 day period. On two occasions during the experimental period, gas exchange rates were also monitored during the light and dark periods. The results allowed determining a phyllochron of 8.65 days. Gas exchange monitoring detected low stomatal conductance rates during the light period. However, starting at 15:30 h, stomatal conductance substantially increased, remaining at maximum levels throughout the dark period, and, subsequently, decreased from 09:30 h, the following light period. A high correlation of stomatal conductance with vapor pressure deficit and leaf temperature was found. Maximum CO2 fixation rates varied between 12.2 and 14.5 µmol m-2 s-1, recorded between 19:19 and 19:26 h. The results corroborate the CAM metabolism of sisal plants cv Ceniza.
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