|Table of Contents|

Effects of Shading on Chlorophyll Fluorescence Parameters of Two Orchid Species

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2024年22
Page:
38-47
Research Field:
Publishing date:

Info

Title:
Effects of Shading on Chlorophyll Fluorescence Parameters of Two Orchid Species
Author(s):
DENG Shiqin1; 2; 3; Meiduozhuoga4; 5; ZHANG Huan5; LUO Jian1; 2; 3
(1.Institute of Plateau Ecology，Xizang Agricultural and Animal Husbandry University；2.Key Laboratory of Xizang Plateau Forest Ecology of Ministry of Education & National；3.Field Scientific Observation and Research Station of Xizang Nyingchi Mountane Forest Ecosystem；4.College of Forestry and Grassland，Nanjing Forestry University/Co-Innovation Center for Sustainable Forestry in Southern China；5.College of Resources and Environment，Xizang Academy of Agriculture and Animal Husbandry)
Keywords:
black out; Cymbidium iridioides; Cymbidium elegans; chlorophyll fluorescence; photosynthetic pigments
PACS:
S 682.31
DOI:
10.11937/bfyy.20242317
Abstract:
Taking Cymbidium iridoides and C.elegans as the test materials,the differences of photosynthetic pigments and chlorophyll fluorescence parameters between them under four different gradient shading treatments were compared by shading,revealing the light conditions suitable for the growth of these two orchids,in order to provide reference for the protection and sustainable use of orchid species in Xizang.The results showed that photosynthetic pigment content significantly changed under the four shading conditions. C.iridioides had the highest pigment content under 40% shading，while C.elegans had the highest pigment content under 20% shading. Fm，Fv/Fm，and Fv/Fo showed an increasing trend with the increase in shading intensity，reaching a significant maximum under 60% shading.The photosynthetic electron transport capacity of both species generally decreased with the increase in shading intensity，with a marked decline under 80% shading.The electron transport activity of PSⅡ in the leaves of C.iridioides was the strongest under 40% shading，while for C.elegans it was strongest under 20% shading；both species exhibited inhibited electron transport activity of PSⅡ under 80% shading.Thermal dissipation in the leaves was the highest under 40% shading for C.iridioides and 20% shading for C.elegans，while the weakest thermal dissipation of PSⅡ was observed under 80% shading for both species.The conclusion was that moderate shading conditions promoted increased photosynthetic efficiency and benefited plant growth，whereas excessive shading led to a decrease in photosynthetic pigments，restricted light energy transfer and conversion，and poor plant growth.The two species showed differences in shade tolerance，with C.iridioides exhibiting greater shade tolerance than C.elegans.The optimal shading condition was 40% for C.iridioides and 20% for C.elegans.

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Last Update: 2024-12-03