Different Surfactants Improve Calcium Uptake into Leaf and Fruit of Washington Navel Sweet Orange Citrus sinensis (L.) Osbeck.and Reduce Albedo Breakdown

摘要：

Albedo breakdown (AB) in sweet orange is a physiological disorder with cracks in the albedo resulting in puffiness of orange peel causing serious economic losses. Insufficient calcium is implicated in AB development. We tested the efficacy of different surfactants added to aqueous solution of Ca (NO3 )2 for spraying leaves and fruits to reduce AB. A solution of 2％ Ca(NO3)2was sprayed either alone or with one of the following surfactants: 0. 05％ Tween 20 , 0.05％ Tween 80, 0.05％ Triton X-100 , and 0. 05％ Tergitol. Spraying was done five times at intervals of 10 days starting from 81 days after full bloom (DAFB) on Washington Navel sweet orange grown in Gingin (Western Australia). Unsprayed trees were treated as control. A randomized block design was used with four replications. Concentrations of Ca in the leaf, rind, and pulp of fruit were determined on 182 and 276 DAFB. The incidence of AB was recorded for each tree as a percentage of the fruit. Surfactants enhanced the uptake of Ca in leaf, rind, and pulp of the fruit and reduced AB compared to the calcium-only treatment. Tween 20 was the most effective surfactant in improving Ca uptake and reducing incidence of AB as well as improving rind hardness and tensile strength. In conclusion, five foliar sprays of 2％ Ca(NO3)2 and Tween 20 starting from 81 DAFB at 10-day intervals improved Ca uptake in leaf, rind and pulp of fruit and reduced the incidence of AB in Washington Navel while maintaining the other important fruit quality attributes.

关键词： Foliar nutrition Tween 20 Creasing Texture properties Fruit quality

作者: Tarn Thi Minh Pham Zora Singh M. H. Behboudian

作者单位: Curtin Horticulture Research Laboratory, School of Agriculture and Environment, Curtin University of Centre for Plant Physiology Research, Massey University,Palmerston North, New Zealand

会议类型: 国际会议

会议名称: 11th International Citrus Congress(第11届国际柑橘大会)

会议地点: 武汉

会议语种:英文

页码: 595-602

在线出版日期: 2008-10-01（万方平台首次上网日期，不代表论文的发表时间）