Back to Contents

FREE FULL TEXT PDF

RELATIONSHIP BETWEEN LEAF ACID PHOSPHATASE ACTIVITY AND EITHER P NUTRITIONAL STATUS OR P EFFICIENCY IN RICE

YONG-FU LI^{1, 2}, AN-CHENG LUO^1*, XING-HUA WEI³ AND ABDUL KHALIQ CHAUDRY⁴

Abstract: To elucidate relationship between leaf acid phosphatase activity (APA) with either P nutritional status or P efficiency in rice, a hydroponic culture experiment supplied with either sufficient P (10 mg P L^-1) or deficient P (0.5 mg P L^-1) was conducted by using 8 rice genotypes different in their response to low P stress.  Plants were sampled at 5, 10, 15 and 20 days after treatments (DAT). Leaf APA, leaf inorganic P concentration, total P concentration and total dry weight of rice plants were determined. Results showed that there were significantly (p<0.05) genotypic variations in P acquisition efficiency (PAE), P use efficiency (PUE) and leaf APA at different plant ages under either sufficient P treatment or deficient P treatment. The response of leaf APA to P deficiency varied significantly (p<0.05) 8 rice genotypes. Correlation analysis showed that relative leaf APA of rice plants was inversely correlated to relative PAE (p<0.01) and was positively correlated to relative PUE (p<0.01), suggesting that leaf APA was closely associated with P efficiency for rice plants. Under deficient P treatment, leaf APA was inversely correlated (p<0.05) to plant P concentration, including leaf inorganic P concentration and plant total P concentration, for rice plants sampled at 10 DAT and 15 DAT, respectively, whereas there was no significant correlation between leaf APA and plant P concentration for rice plants sampled at 5 DAT and 20 DAT, respectively. There date indicated that the extent of P deficiency for rice plants showed whether there was a significant correlation between leaf APA and plant P concentration.

¹Ministry of Education Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Science, Zhejiang University, Hangzhou, 310029, China;

²School of Environmental Technology, Zhejiang Forestry College, Lin’an 311300, China;

³State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China.

⁴Department of Forestry and Range Management, University of Arid Agriculture Rawalpindi, Pakistan.