NDLI: Frost hardiness in the juvenile and adult life phase of ivy (Hedera helix L.)

Content Provider	Springer Nature Link
Author	Andergassen, Sigrid Bauer, Helmut
Copyright Year	2002
Abstract	The common ivy (Hedera helix L.) remains juvenileat its northern, eastern and altitudinal distribution limits although juvenileparts are largely killed by severe frost spells. In order to explain thisdiscrepancy we investigated the seasonal course of frost resistance in variousorgans of juvenile and adult parts of the same H. helixplants. Maximum frost resistance of leaves (LT$_{50}$−25 °C) and axis (xylem parenchyma:LT$_{50}$ −29 °C; cambium: LT$_{50}$−35 °C) was quite the same in juvenile and adultparts. Thus, H. helix is able to acquire full frostresistance in its juvenile phase. However, hardening of leaves was slower anddehardening of axis was faster in juvenile parts. Leaves of juvenile partsremain 2 to 4 K less resistant than those of adult parts untilattaining the maximum resistance. This explains why mainly leaves of thejuvenile parts were damaged following severe frost episodes with temperaturesbelow −20 °C. The occurrence of H.helix in its juvenile phase at the frost-caused distribution limitsmay be explained as follows: Leaves of juvenile plants may occasionally bekilled by severe frosts, but regeneration from dormant eyes enables survival.Loss of leaves may impede the change to the adult phase, but even if the plantsbecame adult frost killing of rest buds (2 to 3 K less resistantthan leaves) would induce rejuvenation.
Starting Page	207
Ending Page	213
Page Count	7
File Format	PDF
ISSN	13850237
Journal	Plant Ecology
Volume Number	161
Issue Number	2
e-ISSN	15735052
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2002-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Ecology Plant Science

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