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Scientific article
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Changes in the photosynthetic activities during several stages of vegetative growth of Spirodela polyrhiza: Effect of chromate

Published inJournal of plant physiology, vol. 157, no. 5, p. 503-512
Publication date2000-11
Abstract

The photosynthetic behavior of fresh green plants, plants carrying turions and the detached turions of Spirodela polyrhiza, was studied by using chlorophyll a (Chl a) fluorescence. The fresh green fronds showed a normal Chl a fluorescence transient, OJIP. However, the mother fronds carrying turions did not show an OJIP transient. Instead, a clear OKJIP with an additional K step, which usually appears due to limitation on the water splitting system, was detected. The K step again disappeared in matured turions. The photosynthetic performance index (PI) of turions was more than 46% lower than the fresh green plants, which has been correlated with a decrease in the probability that an absorbed photon will move an electron into the electron transport chain. Cr2O72- inhibited the plant growth, though it induces the turion formation. Cr2O72- also induces the K step in green fronds. The overall photosynthetic efficiency of PS II and PS I of green fronds was found to be decreased after Cr2O72- treatment.

eng
Keywords
  • Spirodela polyrhiza
  • Chromate
  • Turions
  • PS I
  • PS II
Citation (ISO format)
SUSPLUGAS, Sophie, SRIVASTAVA, Alaka, STRASSER, Reto. Changes in the photosynthetic activities during several stages of vegetative growth of <i>Spirodela polyrhiza</i>: Effect of chromate. In: Journal of plant physiology, 2000, vol. 157, n° 5, p. 503–512. doi: 10.1016/S0176-1617(00)80105-4
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ISSN of the journal0176-1617
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