|Table of Contents|

Comparison of Photosynthetic Parameters Between Pyrus betulaefolia and Pyrus calleryana Under NaCl Stress

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2019年22
Page:
97-104
Research Field:
Publishing date:

Info

Title:
Comparison of Photosynthetic Parameters Between Pyrus betulaefolia and Pyrus calleryana Under NaCl Stress
Author(s):
ZHAO Jiawei1; LI Qingya1; LU Bin1; WANG Meng1; LI Yan1; LU Bingshe1; 2
(1.College of Landscape and Travel，Hebei Agricultural University，Baoding,Hebei 071000；2.The Lab of Forestry Germ Resouce and Protection of Hebei,Baoding,Hebei 071001)
Keywords:
NaCl stress; photosynthetic characteristics; photoresponse; chlorophyll fluorescence
PACS:
-
DOI:
10.11937/bfyy.20184002
Abstract:
In order to compare the salt tolerance of Pyrus calleryana and Pyrus betulaefolia,the effects of different concentrations of NaCl (0,0.15%,0.30%,0.45%,0.60%) on seedling growth,chlorophyll content,photosynthetic characteristics and chlorophyll fluorescence were studied.The results indicated that with the increase of NaCl concentration,chlorophyll a content,chlorophyll b content and total chlorophyll content of Pyrus betulaefolia decreased continuously,but Pyrus calleryana first rose and then decreased.The chlorophyll a/b of Pyrus calleryana and Pyrus betulaefolia first increased and then decreased,and the maximum was reached at 0.30% processing.The net photosynthetic rate,stomatal conductance,transpiration rate,initial fluorescence (F0) and maximum photochemical efficiency (Fv/Fm) of Pyrus betulaefolia decreased with the increase of NaCl concentration,but the decline of Pyrus calleryana was lower than that of Pyrus betulaefolia.The net photosynthetic rate,stomatal conductance,transpiration rate and Fv/Fm of Pyrus calleryana increased first and then decreased.The energy absorbed by the unit reaction center of Pyrus calleryana and Pyrus betulaefolia (ABS/RC),the energy recovered by unit reaction center for reducing QA (TRo/RC),and the energy dissipated by unit reaction center (DIo/RC) as the concentration of NaCl increases,the energy (ETo/RC) used for electron transfer in the unit reaction center rised first and then decreased,indicating that some PSⅡ reaction centers were damaged,and the remaining active reaction centers increased energy consumption efficiency,which would be excessive.The excitation could be dissipated as soon as possible by thermal energy,but the PSⅡ reaction center of Pyrus calleryana was less damaged than Pyrus betulaefolia.In conclusion,under the NaCl stress,the comparison of chlorophyll content,photosynthetic parameters and chlorophyll fluorescence parameters of Pyrus calleryana and Pyrus betulaefolia, Pyrus calleryana was lower than that of Pyrus betulaefolia,indicating that Pyrus calleryana had stronger adaptability in salt stress environment.Therefore,Pyrus calleryana was suitable for planting in the distribution area of Pyrus betulaefolia in China.

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Last Update: 2019-12-11