|Table of Contents|

Effects of Exogenous 24-Epibrassinolide on Photosynthetic Characteristics and Quality of Brassica pekinensis Under Weak Light Stress

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2019年10
Page:
72-79
Research Field:
Publishing date:

Info

Title:
Effects of Exogenous 24-Epibrassinolide on Photosynthetic Characteristics and Quality of Brassica pekinensis Under Weak Light Stress
Author(s):
LI Meng; LIU Songhu; ZHANG Yan; YUE Jianhua; REN Maofei
(College of Horticulture,Xinyang Agriculture and Forestry University,Key Laboratory of Horticultural Plants Genetic Improvement,Xinyang Dabie Mountain,Xinyang,Henan 464100)
Keywords:
24-epibrassinolide(EBR); weak light stress; Brassica pekinensis; photosynthetic characteristics; quality
PACS:
-
DOI:
10.11937/bfyy.20183249
Abstract:
The present study aimed to investigate the effect of exogenous EBR on Brassica pekinensis cultivar (‘Huainan F1’) on growth,photosynthetic,antioxidant metabolism and quality under weak light stress by hydroponic culture.The results showed that the plant height,root length,leaf area,root volume,fresh and dry weight of Brassica pekinensis were significantly inhibited by weak light stress.However,leaf-applied EBR treatment alleviated the growth inhibition in Brassica pekinensis caused by weak light stress.Compared with weak light stress,the application of EBR remarkably increased the net photosynthetic rate (Pn),stomatal conductance (Gs) and transpiration rate (Tr) by 42.4%,107% and 75.3%，respectively.In addition,the level of Fv/Fm,ФPSⅡ and ETR significantly increased by 31.0%,34.4% and 15.7% by BR treatment under weak light stress,whereas,chlorophyll content was decreased by 14.6%.Exogenous EBR also enhanced the activities of SOD,POD,CAT and APX by 36.7%,51.8%,92.7% and 51.2%,resulting in a significant decrease of O?[TX-*4]2 and MDA contents as compared with the stress condition.In the presence of EBR,the contents of vitamin C,soluble sugar and soluble protein increased significantly,while he contents of nitrate and organic acid remarkably decreased in response to weak light stress.The results showed that exogenous EBR effectively improved the activities of antioxidant enzymes,thereby alleviating the inhibition of growth and photosynthesis,and eventually promoted the quality of Brassica pekinensis under weak light stress.

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Last Update: 2019-06-26