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- Title
Phosphorus-acquisition characteristics and rhizosphere properties of wild barley in relation to genotypic differences as dependent on soil phosphorus availability.
- Authors
Ye, Daihua; Zhang, Xizhou; Li, Tingxuan; Xu, Jing; Chen, Guangdeng
- Abstract
Aim: This study focused on P acquisition mechanisms of <italic>Hordeum spontaneum</italic> from P-impoverished soil by measuring plant growth, P acquisition and rhizosphere properties.Methods: Two P-efficient genotypes (IS-22-30 and IS-22-25) and a P-inefficient genotype (IS-07-07) were subjected to a P supply of 0, 30 mg kg−1 (deficient P) and 60 mg kg−1 (sufficient P) in a rhizobag experiment. After 60 days, biomass, P concentration, and P uptake were analyzed. Changes in pH, P fractions and acid phosphatase activity in soil at different distances from the roots were determined, using a slicing technique.Results: P-efficient genotypes showed greater biomass and plant P content, but lower plant P concentration than the P-inefficient genotype. The average seed P content was 113 and 176 μg P per seed of P-efficient genotypes and P-inefficient genotype, respectively. P-efficient genotypes showed P uptake of 3.0 and 7.9 mg pot−1 at 0 and 30 mg P kg−1; while that of P-inefficient genotype was 1.0 and 5.3 mg pot−1, respectively. Acid phosphatase activity was significantly enhanced in the soil-root interface and P-efficient genotypes demonstrated 54% greater activity of rhizosphere acid phosphatase than the P-inefficient genotype. Rhizosphere P fractions showed that P utilized by the two genotypes mainly came from H2O-Pi, NaHCO3-Pi, and NaOH-Pi, while the P-efficient genotypes markedly depleted NaHCO3-Po, NaOH-Po and HCl-Pi, and the depletion zone extended to 4 mm under P deficiency.Conclusions: These results indicate the potential to sustain more growth and greater P acquisition by P-efficient genotypes of wild barley from P-deficient soil through changes of rhizosphere P fractions and enhancing rhizosphere acid phosphatase activity.
- Subjects
PHOSPHORUS in soils; HORDEUM; PLANT growth; RHIZOSPHERE; PHOSPHATASES; GENOTYPES
- Publication
Plant & Soil, 2018, Vol 423, Issue 1/2, p503
- ISSN
0032-079X
- Publication type
Article
- DOI
10.1007/s11104-017-3530-4