Record ID No. |
1314 |
Author(s) |
Pimenta-Barrios,E., Ramirez-Hernandez,B.C , 2003 |
Affiliation |
Departamento de Ecologia, Centro Universitario de Ciencias Biologicas y Agropecuarias, Universidad de Guadalajara, Apartado Postal 39-82, Las Agujas, Zapopan, Jalisco 44410, Mexico. |
Title |
Phenology, growth, and response to light of ciruela mexicana (Spondias purpurea L., Anacardiaceae) |
Source. Vol.(no):Page |
Economic-Botany. 57(4): 481-490p. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Soil plant relations |
Sub-subjects |
Photosynthesis |
Host |
Spondias purpurea (Anacardiaceae) |
Organism |
AMF |
Country |
Maxico, N. America |
Abstracts |
The phenology, growth and response of 25-year-old trees of S. purpurea to light intensity (LI) were studied in Ixtlahuacan del Rio, Jalisco, Mexico, during 1997. Photosynthetic photon flux (PPF) was evaluated at three canopy positions (top, middle, and basal 1/3 of the plant height) in each of the cardinal directions. Three canopy positions based on PPF were also evaluated: shaded (0-700 micro mol m-2 s-1), partially shaded (701-1400 micro mol m-2 s-1), and fully exposed leaves (1401-2000 micro mol m-2 s-1). Shoot extension occurred mainly in spring and summer (April to September). Flowering started in early January, ending in early February. Fruit development started at the middle of February. Fruit ripening started late March, ending in early June. The rate of extension of vegetative shoots was 0.26 cm per day. Root colonization by vesicular arbuscular mycorrhiza was observed. The total root length colonized was 44.3%. Hyphae were more common (44.3%) than arbuscules (9.1%) and vesicles (0.49%). The highest rates of instantaneous and diurnal net CO2 uptake were observed under the highest LI. S. purpurea was highly responsive to PPF levels lower than 500 and approached saturation at rates higher than 1000 micro mol m-2 s-1. CO2 uptake was positively correlated with PPF. The rates of CO2 uptake increased with increasing PPF in the morning then decreased just before noon. Shaded and fully exposed leaves showed low and high rates of instantaneous net CO2 uptake, indicating plasticity to light availability. Fully exposed leaves that developed under the highest LI were thicker than those that developed under shade. Leaves exposed to low LI exhibited the greatest stomatal frequency. |