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当前位置: 首页 > 文章 > A PHYB-PIF4-auxin module promotes tomato graft formation in response to elevated ambient temperature 园艺学报(英文版) 2023
Position: Home > Articles > A PHYB-PIF4-auxin module promotes tomato graft formation in response to elevated ambient temperature Horticultural Plant Journal 2023

A PHYB-PIF4-auxin module promotes tomato graft formation in response to elevated ambient temperature

作  者：
Xia Meng;Feng Zhang;Wencai Yang;Qingmao Shan
单  位：
Beijing Key Laboratory of Growth and Developmental Regulation for Protected Vegetable Crops, Department of Vegetable Science, College of Horticulture, China Agricultural University, Beijing 100193, China; State Key Laboratory of Vegetable Biobreeding, Key Laboratory of Horticultural Crop Biology and Germplasm Innovation (Ministry of Agriculture), Institute of Vegetables and Flowers, Chinese Academy of Agriculture Sciences, Beijing 100081, China;State Key Laboratory of Vegetable Biobreeding, Key Laboratory of Horticultural Crop Biology and Germplasm Innovation (Ministry of Agriculture), Institute of Vegetables and Flowers, Chinese Academy of Agriculture Sciences, Beijing 100081, Chin;State Key Laboratory of Vegetable Biobreeding, Key Laboratory of Horticultural Crop Biology and Germplasm Innovation (Ministry of Agriculture), Institute of Vegetables and Flowers, Chinese Academy of Agriculture Sciences, Beijing 100081, China
关键词：
graft;ambient temperature;formation;elevated;tomato;auxi
摘  要：
Grafting is an effective technique for increasing the resistance of vegetables to biotic and abiotic stresses. It has been widely applied to produce solanaceous and melon vegetables. Temperature is an important external factor affecting graft formation. However, the molecular mechanism by which external ambient temperature affects tomato graft formation remains unclear. In this study, we demonstrated that elevating ambient temperature during grafting to 35 °C for more than 24 h after grafting accelerated vascular reconnection. We generated self- or heterografted combinations between phyB1B2 and pif4 loss-of-function mutant and wild-type plants, and were mutants unresponsive to graft formation at elevated ambient temperature. In addition, elevated ambient temperature induced SlPIF4 expression during grafting. SlPIF4 directly binds the promoters of auxin biosynthesis genes SlYUCCAs and activates their expression. Further investigation revealed auxin accumulation in the graft junction under elevated ambient temperature. The results illuminate the mechanism by which the PHYB-PIF4-auxin module promotes tomato graft formation in response to elevated ambient temperature.

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