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- W828971517 abstract "The transfer of plants to boron-free solutions induces rapid responses inmembrane functions without necessarily affecting root growth and anatomy.In sunflowers (Helianthus annuus), root growth slows within 3-6 h. Howeverin maize (Zea mays), no growth effects are apparent after more than 30 hwithout boron (-B). In both species early disturbances in ion uptake andcell wall deposition are seen.Ultrastructural studies on sunflower root tips after 5.5 h or 3 d -B arereported. Detailed studies on the absorption of Pj and K+ by root tipswere complemented by studies on protoplasts isolated from the root tips of+B and -B plants. There were no significant differences in the protoplastyield or viability according to their B status. Ion absorption by protoplastsisolated from roots of +B and -B plants generally resembled that byintact roots of the corresponding B status.Altering the B status of the protoplasts was expected to initiate earlierresponses than in the roots where cell wall binding and diffusion timesbuffer the system against change; but the greater variability inherent inmeasuring the protoplast responses prevented the detection of subtlechanges.The activities of two+ membrane bound arjzymes were investigated; β-glucansynthetase and a K+-stimulated, Mg2+ -dependent ATPase. UDPG incorporationby protoplasts continued for over 18 h and was consistentlyhigher in +B protoplasts and root membranes than -B. However SEM revealedno significant differences in fibre deposition around sunflower and maizeprotoplasts according to their boron status.(K++Mg2+)-ATPase from sunflower roots was found to be reversiblyimpaired by the loss of B; and preliminary investigations implied thatrestoration of activity when B was resupplied to the intact roots wascorrelated with the B content of the membrane fraction, as determined bythe (n,α) method." @default.
- W828971517 created "2016-06-24" @default.
- W828971517 creator A5018842657 @default.
- W828971517 date "1984-01-01" @default.
- W828971517 modified "2023-09-26" @default.
- W828971517 title "Early effects of boron deficiency on membrane function in higher plants" @default.
- W828971517 hasPublicationYear "1984" @default.
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