Water Relations for Sun and Shade Leaves of Four Mediterranean Evergreen Sclerophylls
1991; Oxford University Press; Volume: 42; Issue: 5 Linguagem: Inglês
10.1093/jxb/42.5.627
ISSN1460-2431
AutoresSophia Rhizopoulou, Maria-Sonia Meletiou-Christou, S. Diamantoglou,
Tópico(s)Greenhouse Technology and Climate Control
ResumoThe water relations, stomatal conductance, size, chlorophyll and proline content have been measured in sun and shade leaves of four evergreen sclerophyll species, throughout the year. It was found that there were no major differences in water status of the two leaf types. However, in young expanding shade leaves, higher stomatal conductance, turgor, chlorophyll and proline content were observed in comparison to sun leaves; such differences tended to disappear in fully expanded leaves. Also, the size of shade leaves was significantly larger. Plastochron ratios of the two leaf types in the four species were similar, indicating a synchronized growth rate related to seasonal rhythmicity. It is suggested that different mechanisms have been operating in the response of the two leaf-types to microclimatic conditions: an avoidance by sun leaves and tolerance by shade leaves.
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