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Title: Aluminum fractions in root tips of slash pine and loblolly pine families differing in Al resistance

Author: Nowak, Jaroslaw; Friend, Alexander L.;

Date: 2005

Source: Tree Physiology 25, 245-250

Publication Series: Scientific Journal (JRNL)

Description: Aluminum (Al) distribution among several cellular fractions was investigated in root tips of seedlings of one Al-resistant and one Al-sensitive family of slash pine (Pinus elliottii Engelm.) and loblolly pine (Pinus taeda L.) grown in nutrient solution containing 100 μM AlCl3 (pH 4) for 167 h. Aluminum present in 5-mm-long root tips was fractionated into cell-wall-labile (desorbed in 0.5 mM citric acid), cell-wall-bound (retained after filtering disrupted cells through 20-μ mesh) and symplasmic (filtrate following cell disruption) fractions. When averaged across both species, 12% of Al absorbed by root tips appeared in the symplasmic fraction and 88% in the apoplasmic fraction (55% as cell-wall-labile, and 33% as cell-wall-bound). On a fresh mass basis, total Al in root tips was lower in loblolly pine than in slash pine, lower in the Al-resistant slash pine family than in the Al-sensitive slash pine family, and lower in the Al-resistant families than in the Al-sensitive families across species. Although the data support the hypothesis that Al-resistant plants limit Al uptake to root apices, they do not exclude other mechanisms of Al resistance. Differential Al resistance between the species and between slash pine families may also be associated with the size of the total non-labile and cell-wall-labile Al fractions, respectively. We were unable to identify the basis for differential Al resistance in loblolly pine.

Keywords: aluminum tolerance, aluminum toxicity, cellular Al, genetic variation, Pinus elliottii, Pinus taeda.

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Nowak, Jaroslaw; Friend, Alexander L. 2005. Aluminum fractions in root tips of slash pine and loblolly pine families differing in Al resistance. Tree Physiology 25, 245-250


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