Department of Plant Physioloyy Negev Institute of Arid Zone Research Beersheva, Israel (Received June 2, 1965) Platit growing under conditions of limited water supply differ from wellwalered platits iti many respects: their growth I.s retarded, they have stnaller shitol to root ratios. Ihey age more rapidly, and thort* are many diflVrences in metaholic pathway.s atid plant composilion (11). Such differences are nol only ohserved when wafer deficits are .severe; Meyer atid (iitigrich (6) showed that application of a slight osmotic pressure (I har, t'.arhowax B O ) to only OO a portion of the roots of wheat plants significantly aliected hoth cerlain tnetabolic fractiotis. and plant growlh. In this case, the results cannot be correlated with changes of water slatus in the shools. Also, reductioti hi the growlh of iilanls exposed to high osmotic concentrations of electrolytes and non-electrolytes is not correlated with a decreased water supply (1, 2, 10). Kinetin and other kinins sustain RNA and protein metabolism and retard aging in leaves (8). Shah and Looniis (9) observed a reduction in the levels of RNA and proteins in hoth water-deficient atid aging sugarheel leaves. The rcdttctioti iti levels of RNA was prevenled if leaves were treated
Physiologia Plantarum – Wiley
Published: Oct 1, 1965
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