摘要
溶液培养和砂培试验研究表明 ,低磷条件下 ,作物主要通过减小根半径、提高根冠比、增加根系比表面积、提高体内有机酸总量及酸性磷酸酶活性等来实现对低磷胁迫的适应。不同作物对低磷胁迫的适应能力不同。不同作物根分泌物对难溶性磷的活化量及作物对难溶性磷的吸收量为象草 >肥田萝卜 >猪屎豆。难溶性磷对作物有效性大小为铝磷 >铁磷 >磷矿粉。难溶性磷的有效性越低 ,作物的根冠比越大 ,养分从作物根部转移到地上部的比例越小。缺磷胁迫明显诱导作物体内有机酸总量的增加和酸性磷酸酶活性的上升。作物不同部位有机酸总量与酸性磷酸酶活性大小为叶片 >茎部 >
Adaptation mechanisms of different crops to low phosphorus stress were investigated with solution culture and sand quartz culture Experimental results demonstrated, under the condition of low P, adaptation of crops to low phosphorus stress were to reduce root radius, increase root shoot ratio, raise specific surface area of plant roots, increase total organic acids, the activity of acid phosphatase etc Different crops have different responses to low phosphorus stress Mobilization of crop root exudates on sparingly soluble phosphates was elephant grass > raphanus > crotalaria Utilization of sparingly soluble phosphates by three crops was elephant grass > raphanus > crotalaria Availability of sparingly soluble phosphates to crops was Al P > Fe P > RP The availability of sparingly soluble phosphate was lower the root shoot ratio was bigger, and the transferring proportion of nutrients from roots to shoots was lower Increases of total organic acids and the activity of acid phosphatase were induced by phosphorus deficiency Under of the condition of P deficiency, the size of total organic acids and the activity of acid phosphatase in different plant parts was leaves > stems > roots
出处
《植物营养与肥料学报》
CAS
CSCD
北大核心
2001年第2期172-177,210,共7页
Journal of Plant Nutrition and Fertilizers
基金
国家自然科学基金项目! (4 96 710 43)
中国科学院南京土壤研究所土壤圈物质循环开放室资助
