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High and low temperature tolerances and their relationships to distribution of agaves

Tipo de material: TextoTextoSeries ; Plant, Cell & Environment, 6(9), p.711-719, 1983Trabajos contenidos:
  • Nobel, P. S
  • Smith, S. D
Tema(s): Recursos en línea: Resumen: The potential influence of tissue tolerances to extreme temperatures on distributional limits was investigated for 15 taxa (14 species)of leaf?succulent agaves from the south?western United States and northern Mexico. As a group, the agaves exhibited a moderate low temperature tolerance of - 11°C (based on a 50 percent inhibition in the number of mesophyll cells taking up a stain, neutral red). However, nearly all of the species were able to tolerate extremely high tissue temperatures of over 60°C. Nocturnal acid accumulation by these crassulacean acid metabolism plants was about 6°C more sensitive to temperature extremes than was cellular membrane integrity.
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The potential influence of tissue tolerances to extreme temperatures on distributional limits was investigated for 15 taxa (14 species)of leaf?succulent agaves from the south?western United States and northern Mexico. As a group, the agaves exhibited a moderate low temperature tolerance of - 11°C (based on a 50 percent inhibition in the number of mesophyll cells taking up a stain, neutral red). However, nearly all of the species were able to tolerate extremely high tissue temperatures of over 60°C. Nocturnal acid accumulation by these crassulacean acid metabolism plants was about 6°C more sensitive to temperature extremes than was cellular membrane integrity.

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