Adaptation To Fe Deficient Stress Of Aerobic Rice

Using nutrient solution culture, the experiments were carried out to study 1) specific mechanisms of aerobic rice adaptive to Fe deficiency Handao 297; 2) effect of ammonium and nitrate on Fe nutrition of Handao 297; and 3) difference in iron nutritional status of different aerobic rice varieties (lines).The main results were as follows:1.Under the condition of Fe deficiency, the amount of phytosiderophores released from Handao 297 was very low compared with wheat, and no peak was observed from the first day to eighth day after Fe removed.2.Under the condition of Fe deficiency, the Fe(III) reducing capacity of aerobic rice did not increase and the rhizosphere was not acidified obviously.3.Aerobic rice plant favored ammonium uptake compared with nitrate in seedling stage. Ammonium supply leaded to pH decrease in nutrient solution and improvement of Fe nutrition with more Fe translocation from root to shoot.4.There were significant differences in the biomass, Fe concentration in plants and seeds, chlorophyll SPAD reading and Fe distribution in shoots and roots among different tested aerobic rice varieties (lines). Handao297 had the highest relative Fe concentration (43%) in shoots and the biggest Fe content in whole plants (560 ug.24 plants-1) under the condition of Fe deficiency, and TPmouzhuxi had the biggest relative biomass (shoot in 106%, root in 108%) and the highest distribution of Fe in shoots (84%) under the condition of Fe deficiency among the tested aerobic rice varieties (lines).5.There were significant differences in the Fe concentration of seeds among different tested aerobic rice varieties (lines).