Application of Principal Component Analysis to Studying the Effects of Phosphorus and Asenic Interaction on the Growth of Rice

ZHANG Aiqun; GUO Hairu; CUI Xuemei; Siqinchaoketu; LI Chunsheng

doi:10.3969/j.issn.1003-6504.2017.07.008

Abstract：The objective of this study was to explore the tolerance and response mechanism of rice varieties with different phosphorus efficiency on the phosphorus (P)-arsenic (As) interaction.One low-P tolerant and one low-P sensitive rice varieties were used to get rice seedlings by soil pot-cultivation.Three phosphorus levels and four arsenic levels were set up to test rice plant height,leaf width,leaf color,dry weight,content of phosphorus,phosphorus accumulation after 35 days' processing.Principal component analysis was carried on and the results showed that P and As treatment had great influence on rice index such as rice height.At the same As level,the higher concentration of P had a certain role in the mitigation of As toxicity and low-P tolerant rice cultivars showed better relief effects than low-P sensitive ones.At the same P level,the SPAD value,content of phosphorus and total P of the rice varieties changed with a similar trend of descending after ascending.The increasing of P and As concentration both could promote rice seedlings absorption and accumulation of P and As.Principal component analysis showed that each of physiological index of the two rice varieties was desirable under the treatment of P 150 mg/kg and As 25 mg/kg.Each index of rice under high level of phosphorus was relatively good and would turn bad gradually by the declining of the P concentration.At the high level of P and As,two rice varieties absorb more P and As,the plant height,leaf weight and SPAD value of low-P tolerant rice variety were larger than those of low-P sensitive rice variety,indicating that the uptake capability of rice to As might be related to its P nutrient character and its competitive absorption between P and As.