Water Relations in Pulvini from Samanea saman
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چکیده
منابع مشابه
A circadian rhythm in oxygen uptake by samanea pulvini.
The rate of O(2) uptake by excised Samanea pulvini oscillates with a circadian rhythm during 52 hours of darkness. Rates of respiration increase during pulvinar opening and decrease prior to and during closure, consistent with the concept that opening requires a greater expenditure of energy. Externally supplied sucrose, necessary for perpetuation of the leaflet movement rhythm, has a small pro...
متن کاملPotassium Flux and Leaf Movement in Samanea saman
Samanea leaflets usually open in white light and fold together when darkened, but also open and dose with a circadian rhythm during prolonged darkness. Leaflet movement results from differential changes in the turgor and shape of motor cells on opposite sides of the pulvinus; extensor cells expand during opening and shrink during closure, while flexor cells shrink during opening and expand duri...
متن کاملEffects of Light on the Membrane Potential of Protoplasts from Samanea saman Pulvini : Involvement of K Channels and the H -ATPase.
Rhythmic light-sensitive movements of the leaflets of Samanea saman depend upon ion fluxes across the plasma membrane of extensor and flexor cells in opposing regions of the leaf-movement organ (pulvinus). We have isolated protoplasts from the extensor and flexor regions of S. saman pulvini and have examined the effects of brief 30-second exposures to white, blue, or red light on the relative m...
متن کاملExtraction And Isolation Of The Alkaloids From The Samanea Saman (Acacia) Bark: Its Antiseptic Potential
Antiseptics are being used to prevent the growth of pathogens which are major causes of diseases. Unfortunately, not everyone can use these antiseptics because of its price in the market. With this, the use of plants as sources of antiseptics gives rise to the continuous study of indigenous plants. Extraction and isolation of constituents such as alkaloid are commonly studied. It is believed th...
متن کاملPlasma membrane aquaporins in the motor cells of Samanea saman: diurnal and circadian regulation.
Leaf-moving organs, remarkable for the rhythmic volume changes of their motor cells, served as a model system in which to study the regulation of membrane water fluxes. Two plasma membrane intrinsic protein homolog genes, SsAQP1 and SsAQP2, were cloned from these organs and characterized as aquaporins in Xenopus laevis oocytes. Osmotic water permeability (P(f)) was 10 times higher in SsAQP2-exp...
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ژورنال
عنوان ژورنال: Plant Physiology
سال: 1987
ISSN: 0032-0889,1532-2548
DOI: 10.1104/pp.83.4.945