|Table of Contents|

Effects of Different Duration of UVA Irradiation on the Occurrence and Morphological Characteristics of Cucumber Downy Mildew

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2019年17
Page:
1-6
Research Field:
Publishing date:

Info

Title:
Effects of Different Duration of UVA Irradiation on the Occurrence and Morphological Characteristics of Cucumber Downy Mildew
Author(s):
GAO Yaqing; YUAN Lei; CHONG Daoqi; HUANG Xiaomei; LIU Shiqi
(State Key Laboratory of Crop Biology，Key Laboratory of Horticultural Crop Biology，Ministry of Agriculture，College of Horticulture Science and Engineering，Shandong Agricultural University，Taian,Shandong 271018)
Keywords:
ultraviolet light; UVA; antioxidant enzyme activity; cucumber; downy mildew
PACS:
-
DOI:
10.11937/bfyy.20184672
Abstract:
‘Jinyou 35’ cucumber was used as test material in a solar greenhouse.The cucumber plants were treated with nighttime irradiation，and no light was added as a control.The test used a discontinuous irradiation method,and the UVA irradiation intensity was 60 μW?cm-2，and the irradiation time was 0,3,4,5 h?d-1,respectively.In order to find out the effects of different irradiation time on the occurrence of cucumber downy mildew and plant growth.The results showed that with the increase of UVA irradiation time，the effect of promoting cucumber growth and resistance to downy mildew was more obvious.After 20 days of UVA irradiation，the control effect was as high as 85.92%.The photosynthetic pigment content increased with the increase of UVA irradiation time.The plant height，stem diameter and leaf area were 36.05%，42.17%,47.01% higher than CK after UVA irradiation for 5 h?d-1.The cross-stalk，single fruit quality and fruit shape index of the fruits treated by UVA irradiation were 94.44%，84.21%,18.60% higher than those of CK，respectively.Under UVA radiation of 5 h?d-1.POD activity was significantly higher than that of CK after 14 days and 21 days，respectively，which was 80.53% and 89.12%.UVA radiation was 5 h?d-1.After 21 days treatment，the PAL activity was significantly higher than 0,3,4 h?d-1，which was 4.64 U?g-1?min-1>2.48 U?g-1?min-1>3.68 U?g-1?min-1>4.35 U?g-1?min-1.At night exposure at 5 h?d-1，the flavonoid content was significantly different from CK at 7，14,21 days，respectively，20.77%，67.42%，89.37% higher than CK.

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Last Update: 2019-09-20