Respiration Studies of Mangrove Seedlings
I. Material and Some Preliminary Experiments
Abstract:The behavior of seedlings of the mangrove species Avicennia marina in water suggested that a detailed study of their respiration rate in air and in nitrogen would be of considerable interest, particularly in relation to the specific ecological habitat they occupy. The investigation was enlarged to include seedlings of Avicennia nitida and Rhizophora mangle, both of the West Indies, and R. conjugata and Brughiera gymnorhiza of East Asia. The present account details the morphology of the seedlings of the three genera. In Avicennia two sizes of seedling were used while in Rhizophora it was possible to use four sizes, very young, young, medium and mature. In Brughiera only mature seedlings were employed.
The initial experiments were designed to give some information about different types of treatment. In Avicennia there is a considerable difference in the respiration depending on whether the seedling is enclosed within the fruit wall or has emerged. The respiration in Avicennia and R. mangle is lower in sea water than in distilled water, which may be due to the great excess of dissolved salts in sea water.
There is also a difference in respiration rate between material floating in 3 ml of medium or on filter paper moistened with 0.5 ml solution (humid atmosphere). In Rhizophora the difference disappears with increasing age of the seedling. Slicing the plant material increases the respiration rate.
Document Type: Research Article
Publication date: January 1, 1962
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