Effects of local phosphate supply on the growth of wheat seedling

Effects of a local phosphate(0.1mmol/L) supply on the growth of wheat(Triticum aestivum L.) seedlings from two genotypes-“81(85)5-3-3-3” and “NC37” are studied.The results show that plant could not grow normally when its 3 cm root zone only grew in complete nutrient solution(LHL).The dry weight of wheat was 54.0% and 49.6% of that of total root system supplied with full nutrient solution(HHH) respectively.The dry weight,shoot height,leaf area,length of root and root axis,and the number of lateral roots of wheat of which 3cm root zone was only in P-deficient solution(HLH) are evidently higher than that of HHH,and its phosphorus content was similar to HHH.It suggests that the growth and development of young wheat could be promoted by the stimulation of a local P-deficiency.This indicates that there is a synergism between phosphorus-deficiency signal and normal condition.It also receives phosphorus-deficiency signal and produces positive growth effect when phosphorus is sufficient in plant.The responses of different genotypes to a local phosphorus supply are different.