biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 45:221-225, 2002 | DOI: 10.1023/A:1015140505515

Modulation of the Photosynthetic Source:Sink Relationship in Cultures of the Cyanobacterium Nostoc Rivulare

A.A. Issa1, A.E. El-Enany1, R. Abdel-Basset1
1 Botany Department, Faculty of Science, Assiut University, Assiut, Egypt

Nostoc rivulare was grown in batch cultures under controlled CO2 and NO3- concentrations to modulate the photosynthetic source:sink relationship. Increasing CO2 supply accelerated the accumulation of chlorophyll (Chl) a, i.e., supplemental CO2 combined with double concentrations of NO3- more than doubled the amounts of Chl a relative to those of the original medium. Photosynthetic oxygen evolution and respiratory oxygen uptake were both enhanced by elevated CO2 and NO3-. Contents of soluble sugars and starch (total non-structural saccharides) as well as insoluble saccharides (structural fraction) were affected by altering CO2-NO3- combinations. Uptake as well as reduction of either NO3- or NO2- was inhibited by CO2 deprivation. Expanding the sink size via increasing NO3- supply enhanced photosynthesis and thus the sink (NO3-) acted as a feed forward stimulator of the source (photosynthesis). The regulatory role of nitrate on photosynthesis was most influential in CO2-deprived cultures since it could enhance photosynthesis to higher levels than CO2-supplemented, nitrate-free cultures.

Keywords: CO2 enrichment; nitrate; photosynthetic oxygen evolution; respiration; sugars
Subjects: chlorophyll, CO2 enrichment, cyanobacteria, nitrate supply; CO2 enrichment; Nostoc rivulare; oxygen evolution and uptake, photosynthesis; respiration, photosynthesis, CO2 enrichment; source:sink relationship, photosynthesis

Published: June 1, 2002  Show citation

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Issa, A.A., El-Enany, A.E., & Abdel-Basset, R. (2002). Modulation of the Photosynthetic Source:Sink Relationship in Cultures of the Cyanobacterium Nostoc Rivulare. Biologia plantarum, 45(2), 221-225. doi: 10.1023/A:1015140505515
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