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Hardening abscisic acid proline and freezing resistance in 2 winter wheat triticum aestivum cultivars


Physiologia Plantarum 63(3): 287-292
Hardening abscisic acid proline and freezing resistance in 2 winter wheat triticum aestivum cultivars
Two cultivars of winter wheat differing in freezing resistance (Holme from Sweden, freezing resistant, and Amandus from Germany, less freezing resistant) were hardened for 5 wk by gradually reducing the day night temperature from 20.degree./15.degree. C during the 1st wk to 2.degree./0.degree. C during the 5th wk and the photoperiod from 15 to 9 h. This treatment increased the freezing resistance of both cultivars in comparison to unhardened control plants. Hardening caused an increase in osmolarity of cell sap and in the levels of proline and abscisic acid (ABA). Increase in osmolarity preceded the increase in ABA level, and proline levels increased later than ABA levels. Holme had higher values of osmolarity as well as higher levels of ABA and proline, but the differences between the 2 cultivars were significant only for proline. Since the pressure potential remained constant or increased slightly during the hardening period, the accumulation of ABA may be due to the hardening process and not to simple water stress caused by cold-induced inhibition of water uptake by the root. Spraying hardened plants with 10-4 M ABA 24 h before a freezing test increased freezing resistance in both cultivars, but did not obliterate the differences in freezing resistance between the 2 cultivars. Spraying hardened plants with an aqueous proline solution (10%, wt/vol) was without effect on freezing resistance. The hardening procedure causes an accumulation of ABA in winter wheat leaves and ABA is involved in the chain of events leading to freezing resistance.

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Accession: 005548354



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