Abstract:
:The responses to drought of the solar tracking winter annualLupinus arizonicus (Wats.) were examined under field and laboratory growth regimes. Under drought conditions tracking movements were maintained until the plant reached the wilting point. The leaves and leaflets were observed to cup in response to decreases in the xylem water potential. This resulted in a negative, but linear relationship between the cosine of the angle of incidence of the direct solar beam upon the leaf and water potential. Leaf conductance was also significantly related to xylem water potential in natural populations. Leaf and leaflet cupping seem to be responding directly to changing plant water status, resulting in reduced solar radiation load to drought stressed plants. It is hypothesized that this property may have adaptive consequences in relation to the water relations, energy budget, and carbon balance of the plant.
journal_name
Oecologiajournal_title
Oecologiaauthors
Forseth I,Ehleringer JRdoi
10.1007/BF00572673subject
Has Abstractpub_date
1980-01-01 00:00:00pages
159-163issue
2eissn
0029-8549issn
1432-1939pii
10.1007/BF00572673journal_volume
44pub_type
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