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Effect of low night temperature on graft union formation in watermelon grafted onto bottle gourd rootstock

文献类型： 外文期刊

作者： Yang, Xingping 1 ; Hu, Xuedan 1 ; Zhang, Man 1 ; Xu, Jinhua 1 ; Ren, Runsheng 1 ; Liu, Guang 1 ; Yao, Xiefeng 1 ; Chen, X 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Vegetable, Jiangsu Key Lab Hort Crop Genet Improvement, Nanjing 210014, Jiangsu, Peoples R China

2.Yangzhou Univ, Coll Hort & Plant Protect, Yangzhou 225009, Jiangsu, Peoples R China

3.Yangzhou Univ, Coll Hort & Plant Protect, Yangzhou 225009, Jiang

关键词： Watermelon;Graft union;Low night temperature;Anatomy

期刊名称：SCIENTIA HORTICULTURAE （ 影响因子：3.463； 五年影响因子：3.672 ）

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收录情况： SCI

摘要： To explore the effects of low night temperatures on graft union formation in watermelon grafted onto bottle gourd rootstock, an anatomical study during the healing stage was performed. In the present study, we compared the morphological anatomy structures during the healing process in grafted watermelon seedlings under different night temperature treatments. The results showed that concrescence occurs fastest at the night temperature of 18 degrees C, at which vascular bridges were connected to vascular bundles at 5 days post-grafting (dpg). For night temperatures of 15 degrees C and 12 degrees C, vascular bridges were connected to vascular bundles at 7 dpg and 10 dpg, respectively. In general, healing rate slowed as night temperature decreased. Low temperatures delayed the differentiation of vascular tissue, which was not conducive to the connection of vascular bundles. The wider gully between the rootstock and scion cut surface caused the callus formation on both sides to fail to link, which turns to the formation of graft union unsuccessful. These results suggest that night temperatures are implicated in graft development in watermelon plants. A minimum temperature of 18 degrees C is indicated during the graft union formation stage. (C) 2016 Elsevier B.V. All rights reserved.

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