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《Journal of Southern Agriculture》 2013-07
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Effects of brassinolide on fruit growth and quality of pitaya

LI Hong-bo,WANG Jun-ning ,CHEN Yi-jie,LI Run-tang(Agricultural College of Guangdong Ocean University,Zhanjiang,Guangdong 524088,China)  
[Objective]Effects of different concentrations (0.25, 0.50, 1.00, and 2.00 mg/L) of brassinolide on growth and quality of pitaya fruit were studied to provide references for improving its yield and quality. [Method]Using single factor experiment with randomized block design, ‘Baiyulong’ pitaya fruit was sprayed with different concentrations of brassinolide at full-bloom stage and the period of fruit rapid expansion (15 days after flowering). Single fruit weight, fruit set rate, fruit shape index, and contents of protein, amino acid, organic acid, VC, sucrose, reducing sugar and total soluble sugar were determined . [ Result ] After two consecutive spraying of brassinolide at full - bloom stage and the period of fruit rapid expansion, fruit set rate at different concentrations was all over 10 percentage higher than that of the control. vnder the concentration of 1.00 mg/L , pitaya single fruit weight was 376.59 g, 20.51% higher than that of the control(308.77 g). The content of total soluble sugar (103.97 mg/g ) in brassinolide treatment was vastly different from that of the control (92.76 mg/g). Fruit longitudinal diameter and transverse diameter were increased. The biggest fruit transverse diameter was 8.46 cm at the concentration of 1.00 mg/L. Under the concentration of 0.50 mg/L, the fruit longitudinal diameter was the largest at 10.75 cm and the fruit shape index was the highest at 1.31. [Conclusion]Spraying brassinolide to pitaya can get better yield and quality through the increase of fruit set rate, single fruit weight and the content of total soluble sugar.
【Fund】: 广东省高等学校本科特色专业建设点资助项目(2010189);; 2011年省级农业标准化专项基金项目(644)
【CateGory Index】: S668.9
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