01933naa a2200229 a 450000100080000000500110000800800410001902200140006002400350007410000190010924501200012826000090024852012770025765000110153465000190154570000200156470000180158470000230160270000220162570000310164777300250167820961412018-09-21       2018    bl uuuu     u00u1 u    #d  a1432-22857 a10.1007/s00468-018-1748-22DOI1 aGIRARDI, E. A.  aRegulated deficit irrigation benefits the production of containergrown citrus nursery trees.h[electronic resource]  c2018  aWe evaluated the impacts of regulated deficit irrigation (RDI) on plant growth, water relations, and biochemical variables of Valencia sweet orange nursery trees grafted on drought-tolerant Rangpur lime (RL) and drought-sensitive Swingle citrumelo (SC) rootstocks in pots. Irrigation was withheld to potting mix water potential of ??15 (mild RDI) and ??25 kPa (moderate RDI), with daily irrigation as control, in three graft growth periods (20?60, 61?120, and 20?120 days after grafting, DAG). Plant growth was reduced by moderate RDI, albeit RL induced more vigor than SC. SC induced higher CO2 assimilation rates and water use efficiency (WUE), regardless of the irrigation regime, and only trees grafted on RL decreased WUE under moderate RDI. Most leaf nutrient concentrations were increased with RDI intensity, while K levels were decreased by moderate RDI. Starch reserves were drastically decreased, while reducing sugars were increased by RDI in all plant organs, most notably in the leaves; roots represented the main source of carbohydrates for both rootstocks under water deficit. Starch concentration promptly recovered in all organs after restoring irrigation. Leaf proline concentration was 20 times higher at RDI, but decreased by 50% just 1 day after rehy.  aCitrus  aFruta Cítrica1 aBRANDÃO, A. D.1 aCOELHO, R. D.1 aCOUTO, H. T. Z. do1 aBUCKERIDGE, M. S.1 aMOURÃO FILHO, F. de A. A.  tTrees, August, 2018.