Intra-specific variation for response to salt and waterlogging in <Emphasis Type="Italic">Acacia ampliceps</Emphasis> Maslin seedlings |
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Authors: | N E Marcar D F Crawford |
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Institution: | (1) CSIRO Ecosystem Sciences, GPO Box 284, Canberra, ACT, 2601, Australia |
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Abstract: | Salinity is a major form of land degradation worldwide, with seasonal or temporary waterlogging often being an associated
issue. Acacia
ampliceps is a highly salt-tolerant small tree, naturally-occurring in north-western Australia, which produces abundant biomass with
potential for fuelwood and fodder. We investigated the extent of variation amongst provenances and families of A. ampliceps for seedling response to salt and waterlogging. Seven-week old seedlings from 27 families (seven provenances, grouped into
two regions), were treated in sand-filled pots in a glasshouse with either mixed salt (S) solutions (150 mol m−3 for 14 days, 300 mol m−3 for 33 days), waterlogging (W) or combined salt (S) and waterlogging (SW). Only 3% of seedlings died, mostly from the combined
salt × waterlogging treatment. Seedlings from the Kimberley region had significantly greater height and shoot biomass than
those from the Pilbara. Within these regions, Wave Hill (seedlot 14631) and Halls Creek (15738) provenances had the best growth.
Height growth was reduced similarly for S- and W-treated plants, whereas that of SW-treated plants was reduced much more.
Salt and waterlogging caused shoot dry weight reduction at harvest of 41 and 46%, respectively, with a slight interaction
between salt and waterlogging; SW treated plants were most affected. Generally there were relatively small differences in
the growth response of provenances and families to salt, but larger (often highly significant) variation in response to waterlogging.
Genotypic variation for shoot and phyllode water content and phyllode number in response to salt and waterlogging was generally
small. The good agreement found at the provenance level between seedling growth in this experiment and growth of young trees
on saline land in a trial in Pakistan suggests that glasshouse screening may be a useful means for selecting potential provenances
for field evaluation. |
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