The influence of leaf windows on the utilization and absorption of radiant energy in seven desert succulents

Title:

The influence of leaf windows on the utilization and absorption of radiant energy in seven desert succulents

Creator:

Egbert, K. J. and Martin, C. E.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:b9821a94-f442-4be5-b814-0f97df3a37fd
uuid:b9821a94-f442-4be5-b814-0f97df3a37fd
issn:0300-3604
doi:10.1023/A:1020129820295

Subject:

chlorophyll fluorescence, Haworthia truncata, Lithops olivacea, Opthalmophyllum longum, Peperomia dolabriformis, Peperomia graveolens, Peperomia pulchella, photoinhibition, photosynthesis, and Senecio rowleyanus

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Four fluorescence parameters [Fv/Fm = the intrinsic efficiency of energy conversion via photosystem 2 (PS2); Fv'/Fm'= the efficiency of energy conversion via PS2 in the light; P = fraction of absorbed radiant energy utilized for photosynthesis; and D = fraction of absorbed radiant energy dissipated as heat] were measured on leaves of seven species of succulents having epidermal windows. While the function of leaf windows has reportedly been to increase absorption of radiant energy and, hence, the rate of photosynthesis in these species, recent evidence indicates that this translucent portion of epidermal tissue, lacking chlorophyll, may also result in photoinhibition in these species, especially for those with growth habits aboveground. Species with aboveground and belowground growth habits were compared with their leaf windows covered with reflective tape and with windows unobstructed. Results showed no increase in photoinhibition for these species resulting from the radiant energy penetrating the window tissue. Although the efficiency of the photosynthetic mechanism was not significantly influenced by the additional radiant energy provided by the window for individual species, there were significant differences in the efficiencies of radiant energy capture (Fv'/Fm') and utilization (P) between the two growth habits. Species with an aboveground growth habit were less efficient in radiant energy utilization compared with the species having a belowground growth habit. and K. J. Egbert, C. E. Martin.

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

35-39

Source:

Photosynthetica | 2002 Volume:40 | Number:1

Harvested from:

CDK

Metadata only:

false