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Home → Publications → Tree Improvement and Genetics → Southern Forest Tree Improvement Conference → 36th Southern Forest Tree Improvement Conference (2021) → Combined effect of temperature and water stress on germination and plant growth of Magnolia pugana, Populus luziarum and P. primaveralepensis endemic and endangered species from western Mexico

Combined effect of temperature and water stress on germination and plant growth of Magnolia pugana, Populus luziarum and P. primaveralepensis endemic and endangered species from western Mexico

Since 2016 we have conducted research on the conservation and germination of Magnolia pugana, Populus luziarum and P. primaveralepensis seeds. Our main objective is to know the response in germination and plant growth with the combination of high temperatures and water stress as these conditions are projected for the area where they are distributed. Since 2018 this research is part of the doctoral project of the student César Jacobo Pereira. Germination tests for M. pugana have been performed with the combination with three temperatures (24, 28 and 37°C) and five water potentials (0, -0.3, -0.6, -0.9 and -1.2 MPa). The interaction of temperature and water potential on germination percentages was significant (ANOVA: F = 3.86, P < 0.001). The highest number of germinated seeds (78%) was obtained at a temperature of 24°C and 0 MPa. These results indicate that germination of M. pugana is severely affected by the interaction between increasing temperatures and decreasing precipitation. In P. luziarum and P. primaveralepensis we tested germination and storage of their seeds at two temperatures. In the first 24 hrs after seed collection, germination was high (91 and 95%, respectively). Germination percentages decreased when stored at 21°C and for more than four weeks. The germination percentage of P. primaveralepensis decreased more slowly than that of P. luziarum at 4°C. This indicates that subtropical Populus subtropical seed storage conditions respond similarly to those in temperate climates. If approved, the grant for which I want to participate will serve to continue my studies and experiments to generate crucial information to establish in situ and ex situ conservation and repopulation programs.


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Author(s): César Jacobo-Pereira, Miguel Ángel Muñiz-Castro, J. Antonio Vázquez-García, Joel Flores, Alejandro Muñoz-Urias, Francisco Martín Huerta-Martínez

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 2021