Study on the morphological and physiological characteristics of roots in rice genotypes with contrasting P efficiency
A hydroponic experiment supplied with either sufficient P (10 mg P·L<sup>-1</sup>) or deficient P (0.5 mg P·L<sup>-1</sup>) was conducted to study the root morphology, root P uptake kinetic parameters and root secreted acid phosphatase activity (APA) of Lianzhen 11 (P-efficie...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2006-11-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://www.academax.com/doi/10.3785/1008-9209.2006.06.0658 |
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| Summary: | A hydroponic experiment supplied with either sufficient P (10 mg P·L<sup>-1</sup>) or deficient P (0.5 mg P·L<sup>-1</sup>) was conducted to study the root morphology, root P uptake kinetic parameters and root secreted acid phosphatase activity (APA) of Lianzhen 11 (P-efficient rice genotype) and Jia 948 (P-inefficient rice genotype). Results indicated that Lianzhen 11 showed greater P uptake than Jia 948 at two different P levels. Compared with Jia 948, Lianzhen 11 had greater root dry weight, root length, root surface area and more lateral roots. Lianzhen 11 showed lower I<sub>max</sub>, K<sub>m</sub> and C<sub>min</sub> than Jia 948 at deficient P treatment, whereas there was no significant difference in I<sub>max</sub> or K<sub>m</sub> between Lianzhen 11 and Jia 948 at sufficient P treatment. Low P treatment significantly increased the I<sub>max</sub> (P<0.05), but significantly decreased the K<sub>m</sub> (P<0.05) for both rice genotypes. Lianzhen 11 showed higher root secreted APA than Jia 948 at deficient P treatment; whereas there was no difference at sufficient P treatment. In conclusion, compared to genotype Jia 948, the higher P efficiency of Lianzhen 11 can be explained by the fact that Lianzhen 11 has a greater root system and maintains a higher root secreted APA and lower K<sub>m</sub> and C<sub>min</sub> under P-deficient conditions. |
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| ISSN: | 1008-9209 2097-5155 |