Water availability effects on germination, membrane stability and initial root growth of Agave lechuguilla and A. salmiana
Por:
Campos, Huitzimengari, Trejo, Carlos, Pena-Valdivia, Cecilia B., Garcia-Nava, Rodolfo, Victor Conde-Martinez, F., Cruz-Ortega, Rocio
Publicada:
1 jul 2020
Resumen:
Water availability during seed germination and seedling development is
critical to plant development and establishment. The aim of this study
was to determine the effects of four water potentials (Psi(w)) ( - 0.03,
- 0.48, -1.19 and - 2.04 MPa) on seed germination, seedling root growth
and root membrane stability of Agave lechuguilla Torr. and A. salmiana
Otto ex Salm-Dyck. to explain the paradoxical situation of vegetatively
propagated species producing large quantities of seeds in a dry climate.
The results showed that seed water uptake and germination percentage
were significantly lower at -1.19 and - 2.04 MPa than at - 0.03 MPa. The
time to reach maximum seed germination increased at low Psi(w). The
final root length and root growth rate were higher in A. salmiana than
in A. lechuguilla and decreased at Psi(w) of -1.19 and - 2.04 MPa. Both
Agave species increased root electrolyte leakage at Psi(w) of -1.19 MPa,
which suggests changes in membrane integrity and stability in response
to the water deficit. These germination and initial root growth
responses could ensure the establishment of both Agave species during
the rare periods with sufficient moisture availability and allow them to
tolerate initial periods of low water availability, although with low
establishment probability.
Filiaciones:
Campos, Huitzimengari:
Colegio Postgrad, Posgrad Recursos Genet & Prod Fisiol Vegetal, Carretera Mexico Texcoco,Km 36-5, Montecillo 56230, Mexico
Trejo, Carlos:
Colegio Postgrad, Posgrad Bot, Carretera Mexico Texcoco,Km 36-5, Montecillo 56230, Mexico
Pena-Valdivia, Cecilia B.:
Colegio Postgrad, Posgrad Bot, Carretera Mexico Texcoco,Km 36-5, Montecillo 56230, Mexico
Garcia-Nava, Rodolfo:
Colegio Postgrad, Posgrad Bot, Carretera Mexico Texcoco,Km 36-5, Montecillo 56230, Mexico
Victor Conde-Martinez, F.:
Colegio Postgrad, Posgrad Bot, Carretera Mexico Texcoco,Km 36-5, Montecillo 56230, Mexico
Cruz-Ortega, Rocio:
Univ Nacl Autonoma Mexico, Dept Ecol Func, Inst Ecol, Ciudad Univ, Ciudad De Mexico 04510, Mexico
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