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- Title
STUDIES OF THE AZOLLA PINNATA-ANABAENA AZOLLAE SYMBIOSIS : GROWTH AND NITROGEN FIXATION.
- Authors
Tung, H. F.; Shen, T. C.
- Abstract
Azolla pinnata grown in a standard medium and on floodwater under the high light (30 to 120 klx) and high temperature (26 to 35 °C) conditions of Malaysia doubled its fresh wt in about 3 and 5 days respectively. The main factor limiting growth and acetylene reduction activity (ARA) of the A. pinnata-Anabaena azollae symbiotic association on floodwater was phosphorus. Addition of phosphorus (P) to P-deficient Azolla in floodwater resulted in an immediate increase in ARA followed by an increase in the growth rate. Minus P treatment caused a 50% reduction of ARA but had little effect on the growth rate of Azolla in the first week. Continued culture of Azolla in the minus P medium caused a significant reduction in growth rate, ARA, and the formation of anthocyanin pigment in the fern. Subsequent transfer into a standard medium did not restore its ARA. Full sunlight also reduced the growth and ARA of Azolla, and P modified the response of Azolla to light.
- Subjects
MALAYSIA; AZOLLA pinnata; AZOLLA; SYMBIOSIS; NITROGEN fixation; BIOGEOCHEMICAL cycles
- Publication
New Phytologist, 1981, Vol 87, Issue 4, p743
- ISSN
0028-646X
- Publication type
Article
- DOI
10.1111/j.1469-8137.1981.tb01710.x