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Genetic Improvement of Root Growth Contributes to Efficient phosphorus Acquisition in maize (Zea mays L.)

Journal of Integrative Agriculture 2013年第6期12卷 1098-1111页

作者： ZHANG Yi-kai CHEN Fan-jun CHEN Xiao-chao LONG Li-zhi GAO Kun YUAN Li-xing ZHANG Fu-suo MI Guo-hua Laboratory of plant-Soil Interactions Ministry of Education/Center for Resources Environment and Food Security College of Resources and Environmental Science China Agricultural University

Maize plants adapt to low phosphorus （p） stress by increasing root growth. It is of importance to know the extent to which genetic improvement of root growth can enhance p acquisiton. In the present study, the contribution of root growth improvement to efficient p acquisition was evaluated in two soils using T149 and T222, a pair of near isogenic maize testcrosses which were derived from a backcross BC 4 F 3 population. T149 and T222 showed no difference in shoot biomass and leaf area under normal growth conditions, but differed greatly in root growth. T149 had longer lateral roots and a larger root surface area compared to T222. In calcareous soil, when p was insufficient, i.e., when p was either supplied as KH 2 pO 4 at a concentration of 50 mg p kg-1 soil, or in the form of phy-p, Ca3-p or Ca10-p, a 43% increase in root length in T149 compared to T222 resulted in an increase in p uptake by 53%, and shoot biomass by 48%. In acid soil, however, when p supply was insufficient, i.e., when p was supplied as KH 2 pO 4 at a concentration of 100 mg p kg-1 soil, or in the form of phy-p, Fe-p or Al-p, a 32% increase in root length in T149 compared to T222 resulted in an increase in p uptake by only 12%, and shoot biomass by 7%. No significant differences in the exudation of organic acids and Apase activity were found between the two genotypes. It is concluded that genetic improvement of root growth can efficiently increase p acquisition in calcareous soils. In acid soils, however, improvements in the physiological traits of roots, in addition to their size, seem to be required for efficient p acquisition.

关键词： p efficiency roots low phosphorus calcareous soil acid soil maize

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Comparison on Responses of Different phosphorus-Efficient Wheat Varieties to phosphorus-Deficiency Stress

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Acta Botanica Sinica 2003年第8期45卷 936-943页

作者：李春俭庞欣张福锁中国农业大学植物营养系农业部植物营养学重点开放实验室北京100094

Six wheat (Triticum aestivum L.) varieties with different phosphorus (p) efficiency, selected according to their relative yield in p-deficient soil to that in p sufficient soil, were used to compare their responses to p deficiency in growth, root and shoot p content and p concentration in leaf phloem exudates in solution culture. Results showed that p deficiency repressed shoot growth, whereas stimulated root growth. Accordingly, root-shoot dry weight ratio of the p deficient plants was relatively larger than that of the p-sufficient plants. Comparing with p-inefficient varieties, the growth rate of shoot and roots of p-efficient varieties was relatively low both under p-sufficient and -deficient conditions. phosphorus deficiency also resulted in decrease in shoot and root p content. The rate of decrease in shoot was faster than in root. Difference in p partitioning in shoot and root between p-efficient and -inefficient varieties could not be observed. However, a negative relationship between p concentration in leaf phloem exudates of nine-day-old seedlings of these wheat varieties and their degrees of p efficiency were found under the p-sufficient condition, with higher in p-inefficient varieties but lower in p-efficient varieties. The reduce rate of p concentration in leaf phloem exudates of p-efficient varieties was rather slower than that of p-inefficient varieties, showing higher relative p concentration in leaf phloem exudates. The relative p concentration in leaf phloem exudates under p deficiency ranged from 35.9% of the p-sufficient controls in p-inefficient varieties to 59.0% in p-efficient varieties on the 10th day after the treatments.

关键词： p efficiency p deficiency wheat

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Effect of phosphate Fertilizers on Growth and Development of Wheat Genotypes in a Calcareous Soil

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pedosphere 1999年第4期9卷 375-378页

作者： WANGQINGREN LIZHENSHENG 等 ResearchCenterforEco－EnvironmentalScience theChineseAcademyofSciencesBeijing100085China Instituteof

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The soybean G3p/pi transporter,GmG3pT3,plays critical roles in root hair growth in response to phosphate starvation

The soybean G3P/Pi transporter,GmG3PT3,plays critical roles ...

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2018全国植物生物学大会

作者： Xinxin Li Yelin Lai Wandong Qi Hong Liao Root Biology Center Fujian Agriculture and Forestry University

phosphorus(p) deficiency is one of principal constraint for crop production *** is well documented that promoting root hair growth enhances p acquisition and thereby improves plant adaptation to p deficient ***,we cloned and characterized aG3 p/pi transporter,GmG3 pT3,from a pi starvation induced soybean SSH *** pattern analysis showed that GmG3 pT3 was primarily expressed in roots,and was highly induced by pi *** staining further exhibited that GmG3 pT3 was predominantly expressed in root ***3 pT3 protein showed transport activity for G3 p and pi in yeast and was localized to the plasma *** expression of GmG3 pT3 significantly modified root hair density and elongation,and thus significantly affected plant growth and p ***,overexpression of GmG3 pT3 consistently improved soybean yield by up to 24.1%,while suppression of GmG3 pT3 dramatically decreased yield at least 15.4%with 12.0%less 100-grain weight compared with non-transgenic lines in the two years’ field *** together,our results suggest that GmG3 pT3 mediates root hair growth in response to pi starvation,and thus enhance soybean growth,improve p efficiency,and yield.

关键词： GmG3pT3 root hair pi starvation p efficiency soybean

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