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AOBPreview published online on March 26, 2009
Annals of Botany, doi:10.1093/aob/mcp074
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© The Author 2009. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Aluminium tolerance and high phosphorus efficiency helps Stylosanthes better adapt to low-P acid soils

Yu-Mei Du1, Jiang Tian2, Hong Liao2, Chang-Jun Bai1, Xiao-Long Yan2 and Guo-Dao Liu1,*

1 Institute of Tropical Crop Genetic Resources, Chinese Academy of Tropical Agriculture Science, Danzhou 571737, China
2 Root Biology Center, South China Agricultural University, Guangzhou 510642, China

* For correspondence. E-mail: liuguodao{at}scuta.edu.cn or liuguodao2008{at}163.com

Received: 30 December 2008    Returned for revision: 14 January 2009    Accepted: 27 February 2009   

Backgrond and Aims: Stylosanthes spp. (stylo) is one of the most important pasture legumes used in a wide range of agricultural systems on acid soils, where aluminium (Al) toxicity and phosphorus (P) deficiency are two major limiting factors for plant growth. However, physiological mechanisms of stylo adaptation to acid soils are not understood.

Methods: Twelve stylo genotypes were surveyed under field conditions, followed by sand and nutrient solution culture experiments to investigate possible physiological mechanisms of stylo adaptation to low-P acid soils.

Key Results: Stylo genotypes varied substantially in growth and P uptake in low P conditions in the field. Three genotypes contrasting in P efficiency were selected for experiments in nutrient solution and sand culture to examine their Al tolerance and ability to utilize different P sources, including Ca-P, K-P, Al-P, Fe-P and phytate-P. Among the three tested genotypes, the P-efficient genotype ‘TPRC2001-1’ had higher Al tolerance than the P-inefficient genotype ‘Fine-stem’ as indicated by relative tap root length and haematoxylin staining. The three genotypes differed in their ability to utilize different P sources. The P-efficient genotype, ‘TPRC2001-1’, had superior ability to utilize phytate-P.

Conclusions: The findings suggest that possible physiological mechanisms of stylo adaptation to low-P acid soils might involve superior ability of plant roots to tolerate Al toxicity and to utilize organic P and Al-P.

Key words: Stylosanthes, phosphorus, P efficiency, organic P, Al toxicity, acid soil


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