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Plant and Soil

, Volume 276, Issue 1–2, pp 143–151 | Cite as

A Comparison of Aluminum Resistance among Polygonum Species Originating on Strongly Acidic and Neutral Soils

  • Jiang Feng You
  • Yun Feng He
  • Jian Li Yang
  • Shao Jian ZhengEmail author
Article

Abstract

Two kinds of Polygonum species (Polygonum aviculare L. and Polygonum lapathifolium L.) grown in tea garden soils at pH around 3.5 and one Polygonum bungeanum Turcz grown in neutral soils were collected to investigate the mechanisms involved in their high Al resistance. Hydroponic experiments showed that the root elongation was only inhibited by 15% in P. aviculare and 35% in P. lapathifolium after exposure to 50 μM Al for 24 h. Their Al resistance was respectively higher than and similar to that in an Al resistant buckwheat (Fagopyrum esculentum Moench) cultivar. In contrast, P. bungeanum was much more Al sensitive since the root elongation was inhibited by 80% under the same condition. The difference in Al resistance among Polygonum species was confirmed in a 10-d intermittent Al treatment experiment, the root biomass of the first two species were unaltered and decreased by 50% in the latter species. However, high Al accumulation was not found in the leaves, indicating these species were not Al accumulators. Oxalate efflux was detected in root exudates of both Al resistant species, efflux initiated within 30 min treatment of 50 μM Al. No organic acid anions were detected in the root exudates of the Al sensitive species. The anion channel inhibitor phenylglyoxal (PG) inhibited the oxalate efflux greatly. Inhibition of root elongation was greater in the presence of PG, confirming that oxalate efflux was associated with the Al resistance. However, since the efflux rate was much lower than their related species buckwheat, other mechanisms must be involved in Al resistance and these need to be studied further.

Key words

Al resistance mechanisms Al stress oxalate secretion Polygonum species 

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Copyright information

© Springer 2005

Authors and Affiliations

  • Jiang Feng You
    • 1
  • Yun Feng He
    • 1
  • Jian Li Yang
    • 1
  • Shao Jian Zheng
    • 1
    • 2
    Email author
  1. 1.College of Environmental and Resource ScienceHangzhouChina
  2. 2.College of Life ScienceZhejiang UniversityHangzhouChina

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