|Table of Contents|

Relationship Between Ultraweak Photon Emission and Photosynthetic Parameters of Cerasus humilisLeaves Chloroplast Under Drought Stress

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2021年09
Page:
25-31
Research Field:
Publishing date:

Info

Title:
Relationship Between Ultraweak Photon Emission and Photosynthetic Parameters of Cerasus humilisLeaves Chloroplast Under Drought Stress
Author(s):
SUN Cong; REN Pengda; LI Lianguo; LI Xiaoyan; GUO Jinli
(College of Horticulture and Plant Protection，Inner Mongolia Agricultural University，Hohhot，Inner Mongolia 010010)
Keywords:
drought stress; Cerasus humilis; ultraweak photon emission; photosynthetic parameters; chloroplast
PACS:
-
DOI:
10.11937/bfyy.20203638
Abstract:
‘Mengyuan’ Cerasus humilis was used as test material,and drought stress,drought + inhibition of PSⅡ activity and regulation of chloroplast were used as treatment methods,the changes of photosynthetic parameters and ultraweak photon emission (UPE) and the relationship between the two were expected to provide a reference basis for the excitation mechanism of UPE.The results showed that under drought stress,the net photosynthetic rate (Pn),transpiration rate (Tr),and stomatal conductance (Gs) of Cerasus humilis leaves showed a downward trend,and the UPE intensity also showed a downward trend; during the drought stress,the above photosynthetic parameters and the intensity of UPE of the leaves of Cerasus humilis were all lower than those of normal watering treatment.Under the conditions of drought stress and LaCl3 inhibition of PSⅡ activity,the Pn,Tr,and Gs of Cerasus humilis leaves gradually decreased under drought stress and drought + LaCl3 treatment,and the UPE intensity also showed a downward trend; under the conditions of inhibiting PSⅡ activity,the above photosynthetic parametersand the UPE intensity were lower than those under drought stress.Correlation analysis also showed that UPE and Pn,Tr,and Gs were positively correlated with drought stress and drought + LaCl3 treatment.Studies on chloroplast UPE found that the intensity of UPE increased with the increase of chloroplast concentration; moreover,the UPE intensity of chloroplasts was significantly lower than that of untreated chloroplasts when PSⅡ activity was inhibited.Based on the above results,drought stress reduced photosynthesis of Cerasus humilis leaves,and also reduced UPE intensity; further inhibited PSⅡ activity,decreased photosynthetic efficiency,and UPE also decreased; under the control of chloroplasts,UPE intensity and chloroplast concentration trends were consistent.The above showed that UPE was closely related to photosynthesis,and chloroplast was one of the organelles that produce UPE.

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Last Update: 2021-08-06