|Table of Contents|

Effects of Low Temperature and Weak Light on the Growth and Physiological and Biochemical Indexes of Sweet Pepper Seedlings and Their Relationship to Varieties Tolerance

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2020年03
Page:
8-14
Research Field:
Publishing date:

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Title:
Effects of Low Temperature and Weak Light on the Growth and Physiological and Biochemical Indexes of Sweet Pepper Seedlings and Their Relationship to Varieties Tolerance
Author(s):
LIU Kaige1; 2; GONG Fanrong1; 2; SONG Yunpeng1; 2; ZHANG Lili1; 2
(1.Horticultural Research Institute,Shanghai Academy of Agricultural Sciences,Shanghai 201403;2.Shanghai Key Lab of Protected Horticultural Technology,Shanghai 201403)
Keywords:
sweet pepper; low temperature and weak light stress; chlorophyll fluorescence parameters; greenhouse cultivation
PACS:
-
DOI:
10.11937/bfyy.20192253
Abstract:
To elucidate the physiological mechanism of tolerance and the physiological and biochemical indexes of sweet pepper to low temperature and weak light stress ,the growth indicators,chlorophyll contents,chlorophyll fluorescence parameters,relative conductivities,malondialdehyde (MDA) content and the change of superoxide dismutase (SOD) activities in different treatment days were studied in two kinds of sweet pepper,‘P12101’ (a low temperature and weak light sensitive variety) and ‘Xiahandi’ (a low temperature and weak light resistant variety) by using the conventional medium culture method in the light incubator.The results showed that,1) the growth of sweet pepper seedings was inhibited under low temperature and weak light stress,the plant height,stem diameter,fresh shoot weight and fresh root weight of two varieties showed a downward trend.Compared to ‘Xiahandi’,the decline range of each growth index of ‘P12101’ was significantly higher.The content of chlorophyll of the two varieties also showed a downward trend under low temperature and low light,of which ‘P12101’ was significantly lower than that of ‘Xiahandi’.2) Chlorophyll fluorescence parameters Fo and Fv/Fm of two sweet pepper varieties had no significant difference under low temperature and week light stress.Y(II) showed remarkable difference after 10 days′ treatment,and Y(NPQ) and Y(NO) showed remarkable differences after 15 days′ treatment.This indicated that although there was no significant difference in optical energy capture and absorption between the low temperature and weak light resistant variety and the low temperature and weak light sensitive variety,the low temperature and weak light resistant variety was more effective in light energy regulation and utilization than the latter.3) MDA content and relative conductivities of the two varieties increased gradually during low temperature and week light treatment,and ‘P12101’ was significantly higher than ‘Xiahandi’.4) SOD activities of the two varieties decreased firstly and then increased due to low temperature and weak light treatment.After 15 days′ treatment,two varieties showed significant difference.The above results indicated that 15 days of treatment was the best time for identification of low temperature and weak light tolerance of sweet pepper varieties.Growth index,chlorophyll content,relative conductivity,MDA content,chlorophyll fluorescence parameters Y (II),Y (NPQ) and Y (NO) could be used as identification indexes of low temperature and weak light tolerance of sweet pepper,and among them,chlorophyll fluorescence parameters Y (II),Y (NPQ) and Y (NO) were more suitable.

References:

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Last Update: 2020-02-26