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Acta Horticulturae Sinica ›› 2023, Vol. 50 ›› Issue (6): 1368-1376.doi: 10.16420/j.issn.0513-353x.2022-0333

• New Technology & New Method • Previous Articles     Next Articles

Establishment of a Method for Quantitative Detection of Latent Infection of Powdery Mildew in Wine Grape by Real-time PCR

WANG Wenwen, ZHANG Qiangqiang, LI Ling, JIN Jing, WANG Ruotong, GU Peiwen()   

  1. College of Agronomy,Ningxia University,Yinchuan 750021,China
  • Received:2022-10-08 Revised:2023-03-13 Online:2023-06-25 Published:2023-06-27
  • Contact: * (E-mail:gupeiwen2019@nxu.edu.cn

Abstract:

In order to caculate molecular-detected disease index(MDI)of grape powdery mildew,according to the P450 sequence of Uncinula necator and EF1-α sequence of Vitis vinifera L.,pairs of primers,F-P450-Un/R-Un and F-g-6/R-g-6,were designed to establish the real-time PCR reaction system. The sensitivity of real-time PCR of V. vinifera and U. necator was 1.0 × 10-2 ng · µL-1 and 1.0 × 10-5 ng · µL-1 genomic DNA respectively,which was 100 and 1 000 times greater than that of the conventional PCR. At the same time,the standard curves of V. vinifera and U. necator were established respectively. There were good linear relationship between the cycling threshold(Ct)and template DNA concentration with the correlation coefficient of 0.99637 and 0.99564 respectively. Application of this technology to detect 30 samples in the field. A total of 22 samples were detected to contain grape powdery mildew, and the MDI was significantly correlated with the field DI after 18 days (correlation coefficient was 0.916). The established real time PCR system of U. necator could provide theoretical basis for early detection and monitoring of powdery mildew.

Key words: Vitis vinifera, Uncinula necator, early diagnosis, real-time PCR, molecular-detected diseases index, field disease index

CLC Number: