Comparison of Rhizosphere Impacts of Wheat (Triticum aestivum L.) Genotypes Differing In Phosphorus Efficiency On An Acidic and An Alkaline Soil.

Comparison of Rhizosphere Impacts of Wheat (Triticum aestivum L.) Genotypes Differing in Phosphorus Efficiency on an Acidic and an Alkaline soil

LIU Wen-Ke¹,² HOU Yan-Yan ¹, ZHAN Xiao-Ying ¹, ZHANG Shu-Xiang ^1*

1 Ministry of Agriculture Key Laboratory of crop Nutrition and fertilization, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences 100081, Beijing, China;

2 Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Key Lab. for Agro-Environment & Climate Change, Ministry of Agriculture,Beijing 100081, China.

ABSTRACT

Exploitation of high phosphorus (P) use efficiency genotypes of crops and understanding their rhizosphere effect are essential to development of management practices for sustainable agricultural production. A glasshouse study was conducted to compare the rhizosphere characteristics of two wheat genotypes, Xiaoyan54 (XY54) and Jing411 (J411) on acidic and alkaline soil. The results showed P application increased P content of shoot and total for two wheat lines significantly on two of contrasting soils in properties; but P fertilization enhanced their biomass of shoot and root on alkaline soil, but not for acidic soil. XY54 decreased rhizosphere pH significantly than that of J411 without P addition, but similar acidity ability was showed when P applied on alkaline soil. Two wheat lines showed similar rhizosphere phosphatase activity on alkaline soil, while XY54 demonstrated greater rhizosphere phosphatase activity than J411 on acidic soil under two P supplication levels. The acidification on alkaline soil was a principal rhizosphere mechanisms for XY54 to acquire more P in low P soil, and resulted higher root uptake; P deficiency response was not presented for two genotypes in the two P levels in the experiment for acidic soil for wheat growth. The  phosphatase activity for XY54 was higher than that of J411 on acidic soil, which did not resulted higher P uptake. It indicated that the soil type and P level could change the growth, P uptake and rhizosohere properties of wheat genotypes.

1* Corresponding Author Zhang ShuXiang, E-mail: sxzhang@caas.ac.cn

Keywords: Genotype, Phosphatase activity, Rhizosphere acidity, Soil type, Wheat