|Table of Contents|

Effects of Exogenous Sulfur on Photosynthetic Traits in Apple Seedlings Under Cadmium Stress

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2020年12
Page:
17-24
Research Field:
Publishing date:

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Title:
Effects of Exogenous Sulfur on Photosynthetic Traits in Apple Seedlings Under Cadmium Stress
Author(s):
LIANG Kuijing1; GAO Xiaokuan1; YU Zhanjing1; WANG Fangfang1; LIU Hui2; HOU Xiaojie1
(1.College of Life Science,Hengshui College,Hengshui,Hebei 053000;2.Institute of Guizhou Biotechnology,Guizhou Academy of Agricultural Sciences,Guiyang,Guizhou 550006)
Keywords:
sulfur; cadmium stress; apple; chlorophyll fluorescence parameters; mineral element
PACS:
-
DOI:
10.11937/bfyy.20194035
Abstract:
Malus pumila (apple) was taken as materials,a pot experiment was conducted to investigate the effects of exogenous (NH4)2SO4 on photosynthetic pigments,photosynthetic characteristics,chlorophyll fluorescence parameters,and mineral element contents in apple seedlings with the teatment of 10 mg?L-1 CdCl2.In order to uncover the intrinsic mechanism of excess sulfur(S) in detoxification of cadmium(Cd) on the aspect of photosynthetic characteristics.The results indicated that Cd stress lead to the significant reduction in contents of chlorophyll a and b,as well as the decreasing in net photosynthesis rate(Pn),transpiration rate(Tr),stomatal conductance(Gs),and intercellular concentrations of carbon dioxide(Ci).Cd induced inhibition of apple leaf photosynthesis were mainly attributed to the blocking of chlorophyll biosynthesis and leaf stoma.Cd treatment also resulted in disfunction of photosystem II(PSⅡ) in apple seedlings by significantly decreasing actual photochemical efficiency,electron transfer efficiency,and chemical quenching coefficient,while increasing nonchemical quenching coefficient.However,after the addition of 100 mg?L-1 (NH4)2SO4 in Cd treatment,the contents of chlorophyll a and b,ratio of chlorophyll a/b were all significantly increased.And the photosynthesis and quantum yield of PSⅡ photochemistry were both significantly improved.Meanwhile,Cd treatment significantly decreased content of magnesium(Mg),manganese(Mn),and copper(Cu),while there was no significant variation on iron(Fe) content.Exogenous S resulted in the increasing contents of Mg,Mn,and Cu,as well as Fe.These results implied that the Cd incited photosynthesis inhibition and PSⅡ disfunction might be involved in the decreasing Mg,Mn and Cu content in apple seedling leaves,but not Fe.However,surplus S could improve the photosynthesis and chlorophyll fluorescence parameters in apple seedlings under Cd stress by increasing the absorption of Mg，Fe，Cu and Mn.

References:

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Last Update: 2020-08-19