Effects of temperature on h uptake and release during circadian rhythmic movements of excised samanea motor organs.
نویسندگان
چکیده
A previous study revealed that Samanea saman leaflets open more completely and close less completely as temperature is increased. We now demonstrate that, as temperature is increased, extensor cells release more H(+) during their swelling phase (opening), but flexor motor cells release less H(+) during their swelling phase (closure).
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 Temperature on H Secretion and Uptake by Excised Flexor Cells during Dark-Induced Closure of Samanea Leaflets.
Previous studies reveal that dark-induced closure of Samanea leaflets is accompanied by H(+) secretion from flexor motor cells. We now report that flexor tissue excised in the light, incubated in a weakly buffered bathing solution, and then darkened at different temperatures (18 degrees C-30 degrees C) acidified the medium (indicating net H(+) efflux) at all temperatures tested, but most rapidl...
متن کاملDiurnal and circadian regulation of putative potassium channels in a leaf moving organ.
In a search for potassium channels involved in light- and clock-regulated leaf movements, we cloned four putative K channel genes from the leaf-moving organs, pulvini, of the legume Samanea saman. The S. saman SPOCK1 is homologous to KCO1, an Arabidopsis two-pore-domain K channel, the S. saman SPORK1 is similar to SKOR and GORK, Arabidopsis outward-rectifying Shaker-like K channels, and the S. ...
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...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Plant physiology
دوره 86 2 شماره
صفحات -
تاریخ انتشار 1988