The Experimental Study of Litchi(Litchi chinensis Sonn) Parthenocarpy Induced by Heterocyclic Ureas Cytokinin

【Objective】The objective of the study is to explore the possibilities of the parthenocarpic seedless fruits of the non-parthenocarpic ability litchies and the abnormal fruits of the parthenocarpic ability litchi were produced by applying heterocyclic urea cytokinin-induction,【Method】2mg/L of the heterocyclic urea cytokinin preparation were applied to spraying directly on the ears in flowering of non parthenocarpic Guiwei,Guanglianghong,Feizixiao and of parthenocarpic Hainan Seedless Litchies at Lianjiang Liangdong town's orchard,10-15 dthen sprayed 1times,the parthenocarpic fruits,abnormal fruit and the normal fruits were sampled and determined analysis when they get ripe.【Result】The results showed that the parthenocarpic seedless fruits of the non-parthenocarpic ability Guiwei,Guanglianghong and Feizixiao litchies and the abnormal fruit of parthenocarpic Hainan Seedless litchi were induced by applying heterocyclic urea cytokinin to Litchies in flowering,but parthenocarpic fruits were smaller than normal fruit,the average fruit weights of the parthenocarpic fruit of Guiwei,Guanglianghong,Feizixiao litchies and of the abnormal fruit of Hainan Seedless litchi were decreased by 112.2%,29.5%,93.1%and 79.3%relative to of the normal fruit respectively;the soluble solids contents of the parthenocarpic seedless fruits of Guiwei and Guanglianghong litchies were higher than of fruit of normal Guiwei and Guanglianghong,and of the parthenocarpic fruit of Feizixiao and of the abnormal fruit of Hainan Seedless litchies were lower than of normal fruit.【Conclusion】The studies suggested that the parthenocarpic potential,of some non-parthenocarpic ability varieties of litchies may were stimulated by heterocyclic urea cytokinin,and the parthenocarpic fruits of the non-parthenocarpic ability litchies may were produced by chemical-induction process.