We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Photosynthetic acclimation of Tradescantia albiflora to growth irrandiance: Lack of adjustment of light-harvesting components and its consequences.
- Authors
Chow, W. S.; Adamson, Heather Y.; Anderson, Jan M.
- Abstract
The photosynthetic acclimation of Tradescantia albiflora (Kunth). a trailing ground species naturally occurring in the deep shade of rainforests, was studied in relation to growth irradiance (glasshouse; direct light and 1 to 4 layers of shade cloth, giving 100 to 1.4% relative growth irradiance). Contrary to other irradiance studies of higher plants grown in natural habitats or controlled light environments, the chlorophyll a/b ratios of Tradescantia leaves were low (-2.2) and constant. Acclimation to growth irradiance caused no changes in the relative amounts of specific Chl-proteins or the numbers of photosystem I (PSI) and PSII reaction centres on a chlorophyll basis, indicating that the light-harvesting antenna sizes of PSII and PSI, as well as the photosystem stoichiometry, were independent of growth irradiance. However, the amount of cytochrome f and ATP synthase on a chlorophyll basis increased with increasing the relative growth irradiance from 1.4 to 35%. showing acclimation of electron transport and photophosphorylation capacity. The photosynthetic capacity and ribulose 1, 5-bisphosphate carboxylase (BC 4.1.1.39) activity also increased with increase of the growth irradiance to 35%. Beyond that, the inflexible PSII/PSI stoichiometry and shade-type photosystem II/hight-harvesting units in Tradescantia are a disadvantage for long-term exposure to high irradiance since the leaves are more prone to photoinhibition.
- Subjects
SMALL-leaf spiderwort; ACCLIMATIZATION (Plants); PHOTOSYNTHESIS; CHLOROPHYLL; PLANT photoinhibition; TRADESCANTIA
- Publication
Physiologia Plantarum, 1991, Vol 81, Issue 2, p175
- ISSN
0031-9317
- Publication type
Article
- DOI
10.1111/j.1399-3054.1991.tb02126.x