Cytokinin but not gibberellin application had major impact on the phenylpropanoid pathway in grape  

作　　者：Kamal Tyagi Itay Maoz Bettina Kochanek Noa Sela Larry Lerno Susan EEbeler Amnon Lichter 

机构地区：[1]Department of Postharvest Science,Agricultural Research Organization,The Volcani Center,Rishon LeZion,Israel [2]Department of Viticulture and Enology,University of California,Davis,CA 95616,USA [3]Department of Plant Pathology,Agricultural Research Organization,The Volcani Center,Rishon LeZion,Israel [4]Food Safety and Measurement Facility,University of California,Davis,CA 95616,USA

出　　处：《Horticulture Research》2021年第1期599-613,共15页园艺研究（英文）

基　　金：a United States-Israel Binational Agricultural Research and Development Fund Grant(No.IS-4957-16R);The sequencing was carried out at the UC Davis Genome Center DNA Technologies and Expression Analysis Core,supported by NIH Shared Instrumentation Grant 1S10OD010786-01.

摘　　要：Cytokinin and gibberellic acid(GA)are growth regulators used to increase berry size in seedless grapes and it is of interest to understand their effects on the phenylpropanoid pathway and on ripening processes.GA 3 and synthetic cytokinin forchlorfenuron(N-(2-chloro-4-pyridyl)-N′-phenylurea,CPPU)and their combination were applied to 6 mm diameter fruitlets of‘Sable Seedless’,and berries were sampled 51 and 70 days(d)following application.All treatments increased berry size and delayed sugar accumulation and acid degradation with a stronger effect of CPPU.CPPU,but not GA,reduced berry color and the levels of anthocyanins.While CPPU reduced the levels of anthocyanins by more than 50%,the combined treatment of GA+CPPU reduced the levels by about 25%at 51 d.CPPU treatment had minor effects on flavonols content but increased the levels of monomeric flavan-3-ols by more than two-fold.Phloroglucinol analysis using HPLC showed that proanthocyanidin content was significantly increased by CPPU,whereas mean degree of polymerization was reduced from 26 to 19.Volatile analysis by GC-MS showed changes in composition with CPPU or GA treatment with potential impact on flavor.RNA-seq analysis showed that GA had a minor overall effect on the transcriptome whereas CPPU had pronounced effects on gene expression at both 51 and 70 d.Comparing the control and CPPU at similar Brix of ca.19.7°,a reduced expression of stilbene synthases(STSs)including their regulators MYB14 and MYB15,and other phenylpropanoid-related genes was observed in CPPU-treated grapes.Overall,our study shows that CPPU had a major influence on the phenylpropanoid pathway and affected multiple ripening-related processes.

关 键 词：CPPU IMPACT treatment 

分 类 号：S663.1[农业科学—果树学]