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| Effects of Different Temperature at Night on Healing of Tube Grafted Eggplant Plug Seedlings |
| ZHAO Yuan-yuan 1，DONG Chun-juan 1，ZHAO Jian-zhong 2，SHANG Qing-mao 1* |
1 Key Laboratory of Biology and Genetic Improvement of Horticultural Corps，Ministry of Agriculture，Institute of
Vegetables and Flowers，Chinese Academy of Agricultural Sciences，Beijing 100081，China；2 Agriculture Seed General
Station of Shanxi Province，Taiyuan 030006，Shanxi，China |
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Abstract Taking eggplant（Solanum melongena L.）‘Qiezhen No.1’as rootstock and‘ Kuaiyuanqie’as
scion，this experiment designed treatments with different temperatures（19 ℃，24 ℃，29 ℃）at night to study
the effect of different night temperature on the rate and quality of healing in tube grafted eggplant seedlings by
microscopic inspection．The results showed that the layers of callus cells were increased and the diameters of
joint part were enlarged．While，the process of vascular connection and healing was slowed down，the xylem
translocation ability was weakened，and the quality of healing was deteriorated．The isolation layer completely
disappeared，and vascular was connected on the 13th day after grafting under treatment with 19 ℃ at night．Compared
to the treatment with 29 ℃，the xylem translocation ability was improved by 72.89%．Under treatment with
29 ℃ at night more callus was observed on the 9th day，the diameter of joint part was significantly increased by
13.35%，compared to the treatment with 19 ℃ at night，but the healing process was slower．In conclusion，
under the condition of 29 ℃ day temperature，19 ℃ is the best night temperature for healing of tube grafted
eggplant．
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Received: 25 September 2014
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