Growth response of Eucalyptus microtheca provenances to water stress

Li C., . Growth response of Eucalyptus microtheca provenances to water stress. pp. 379-387. ISSN 0128-1283

LI C. 1998. Growth response of Eucalyptus microtheca provenances to water stress. Growth variation was observed under three watering regimes in a greenhouse experiment among four Eucalyptus microtheca provenances whose natural habitats represented a gradient of different climatic conditions. Compared with provenances from northern and central Australia southeastern Australian provenances showed a faster early seedling growth in the different treatments. There were significant correlations between shoot biomass total biomass or total leaf area and driest-quarter rainfall of the natural habitats of the provenances. The pattern of shoot height growth for each provenance in relation to the watering regime indicated a linear regression in the control treatment whereas the growth response followed a curvilinear regression under water stress. In addition statistically significant differences in leaf stomatal length were detected between the provenances. These results were interpreted as suggesting that there are different adaptive strategies in response to water deficit among the provenances of this eucalypt species which are manifested when the provenances are grown outside their natural Australian range. It is suggested that the northern and central provenances would not be able to take advantage of favourable hydrological conditions to the extent the southeastern Australian provenances would do in a similar situation.

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Abstract

LI C. 1998. Growth response of Eucalyptus microtheca provenances to water stress. Growth variation was observed under three watering regimes in a greenhouse experiment among four Eucalyptus microtheca provenances whose natural habitats represented a gradient of different climatic conditions. Compared with provenances from northern and central Australia southeastern Australian provenances showed a faster early seedling growth in the different treatments. There were significant correlations between shoot biomass total biomass or total leaf area and driest-quarter rainfall of the natural habitats of the provenances. The pattern of shoot height growth for each provenance in relation to the watering regime indicated a linear regression in the control treatment whereas the growth response followed a curvilinear regression under water stress. In addition statistically significant differences in leaf stomatal length were detected between the provenances. These results were interpreted as suggesting that there are different adaptive strategies in response to water deficit among the provenances of this eucalypt species which are manifested when the provenances are grown outside their natural Australian range. It is suggested that the northern and central provenances would not be able to take advantage of favourable hydrological conditions to the extent the southeastern Australian provenances would do in a similar situation.

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Item Type:	Article
Additional Information:	Summaries (En Ms)
AGROVOC Term:	EUCALYPTUS MICROTHECA
AGROVOC Term:	GROWTH
AGROVOC Term:	DROUGHT STRESS
AGROVOC Term:	CLIMATIC FACTORS
AGROVOC Term:	PROVENANCE
AGROVOC Term:	LAND VARIETIES
AGROVOC Term:	SEEDLINGS
AGROVOC Term:	AUSTRALIA EUCALYPTUS MICROTHECA
AGROVOC Term:	CRECIMIENTO
AGROVOC Term:	ESTRES DE SEQUIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:52
URI:	http://webagris.upm.edu.my/id/eprint/17762

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