| Autor: |
Elly P.H. Best, A.K. Van Der Werf |
| Přispěvatelé: |
Limnological Institute |
| Rok vydání: |
1986 |
| Předmět: |
|
| Zdroj: |
Aquatic Botany, 26(3-4), 235-246. Elsevier B.V. |
| ISSN: |
0304-3770 |
| DOI: |
10.1016/0304-3770(86)90024-0 |
| Popis: |
Maintenance and growth respiration were determined in plants of Ceratophyllum demersum L. growing in a steady state. Growth respiration (0.255 mg C g AFDW−1 h−1) was three times that required for maintenance (0.072 mg C g AFDW−1 h−1). Respiration was linearly related to the water-soluble sugar level when total water-soluble sugar concentrations were lower than 6% of the plants' ash free dry weight. Initially, reducing and non-reducing sugars were utilized as substrates for respiration. Starch was mobilized when the raffinose content neared depletion. The respiration rates were higher in quiescent plants than in plants cultivated for 2–3 weeks at higher temperatures. The Q10 values of respiration were similar in both growth stages (1.2 and 1.3 in quiescent and 2–3 weeks cultivated plants, respectively), indicating that the plant tissues were rich in carbohydrates. The presently measured respiration rates agreed well with relative growth rates determined on other occasions. The mass carbon balance and respiration estimates show generally low respiratory losses, possibly as a consequence of the rootlessness of the plant species. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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