Difference in P utilization from organic phosphate between two rice genotypes and its relations with root-secreted acid phosphatase activity

With two rice genotypes (cv. Zhongbu 51 and Azucena) differing in their root-secreted acid phosphatase activity (APA) under low P condition as test materials, an agar culture experiment was conducted to investigate their P utilization from myo-inositol hexaphosphate (IHP) under conditions of sterili...

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Bibliographic Details
Published inYing yong sheng tai xue bao Vol. 20; no. 5; p. 1072
Main Authors Li, Yong-Fu, Luo, An-Cheng, Wu, Liang-Huan, Wei, Xing-Hua
Format Journal Article
LanguageChinese
Published China 01.05.2009
Subjects
Acid Phosphatase - metabolism
Acid Phosphatase - secretion
Genotype
Organophosphates - metabolism
Oryza - enzymology
Oryza - genetics
Phytic Acid - metabolism
Plant Roots - enzymology
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Summary:With two rice genotypes (cv. Zhongbu 51 and Azucena) differing in their root-secreted acid phosphatase activity (APA) under low P condition as test materials, an agar culture experiment was conducted to investigate their P utilization from myo-inositol hexaphosphate (IHP) under conditions of sterilization and inoculating with soil microorganisms. Under sterilization, the shoot dry mass, P absorption and P concentration of test genotypes supplied with hexaphosphate (IHP) as the P source were significantly higher than those with no P supply, but significantly lower than those supplied with inorganic P, indicating that rice plants could partly acquire P from IHP under sterilized condition. The root-secreted APA of the two genotypes was significantly higher under low P than under sufficient P supply, and the higher APA of Zhongbu 51 under low P could be one of the mechanisms of higher P utilization capability of Zhongbu 51 than Azucena under deficient P supply. When supplied with high level IHP (0.96 mmol P x L(-
ISSN:1001-9332