By J. Levitt (auth.)

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Extra resources for Frost, Drought, and Heat Resistance

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Other changes, such as increased carbohydrate content were noted. A completely different protective substance has been used by JEREMIAS (1956). , then continued their gprmination in solutions of D-ribose. Controls were allowed to continue germination in isosmotic glucose solutions. A little thymol was included to prevent growth of microorganisms. After 15 days, 2 leaves had formed, and the plants were tested by transfer to a cold chamber. In all cases, the seedlings germinated in the ribose solution showed better survival (Table 6).

They also. gave a positive test with phlDroglucin, shDwing the presence of pentoses or pentosans. GlucDsamine Dr Dther aminDsugars were not fDund, therefore the substances could not be mucDprDteins. He concludes that they must he glycoproteins which can bind water strongly due to their many hydrophilic groups-much more strDngly than can pure prDteins. He even suggests that the often observed rise in osmDtic value Df the cell sap on hardening is an adaptatiDn to prevent injury to the protoplasm due to excessive swelling of the glycoproteins.

Maleic hydrazide, and subjected them to. IDw temperature at the "green bud" and "open fLDwer" stages. thers. ped in thDse buds nDt tQD strDngly inhibited, and (3) the delay in blossDming tended to. reduce frDst damage. The net effect, however, was a reduced yield. MORETTI (1953) was unable to. delay bud develDpment by any Df the winter sprays he tried; therefDre none protected against late frost. In two. cases, sprays have been asserted to. increase hardiness. CORNS and SCHWERDTFEGER (1954) grew beet seedlings in vermiculite moistened with (a) water, (b) 4-8 ppm.

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