Abscisic acid content, transpiration, and stomatal conductance as related to leaf age in plants Xanthium strumarium L

Journal Article · Thu Jan 01 04:00:00 EST 1976 · Plant Physiol.; (United States)

DOI:https://doi.org/10.1104/pp.58.2.169· OSTI ID:7107094

Raschke, K; Zeevaart, J A.D.

Among the four uppermost leaves of greenhouse-grown plants of Xanthium strumarium L., the content of abscisic acid per unit fresh or dry weight was highest in the youngest leaf and decreased gradually with increasing age of the leaves. Expressed per leaf, the second youngest leaf was richest in ABA; the amount of ABA per leaf declined only slightly as the leaves expanded. Transpiration and stomatal conductance were negatively correlated with the ABA concentration in the leaves; the youngest leaf lost the least amount of water. This correlation was always very good if the youngest leaf was compared with the older leaves but not always good among the older leaves. Since stomatal sensitivity to exogenous (+-)-ABA was the same in leaves of all four age groups ABA may be in at least two compartments in the leaf, one of which is isolated from the guard cells. The ability to synthesize ABA in response to wilting or chilling was strongly expressed in young leaves and declined with leaf age. There was no difference between leaves in their content of the metabolites of ABA, phaseic, and dihydrophaseic acid, expressed per unit weight.

• Research Organization: Michigan State Univ., East Lansing
• OSTI ID: 7107094
• Journal Information: Plant Physiol.; (United States), Journal Name: Plant Physiol.; (United States) Vol. 58; ISSN PLPHA
• Country of Publication: United States
• Language: English

Related Subjects

550200* -- Biochemistry
59 BASIC BIOLOGICAL SCIENCES
ABUNDANCE
AGE DEPENDENCE
BIOCHEMISTRY
BIOMASS
BIOSYNTHESIS
CHEMISTRY
ENERGY SOURCES
HORMONES
LEAVES
OPENINGS
PLANTS
RENEWABLE ENERGY SOURCES
STOMATA
SYNTHESIS
TRANSPIRATION