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- Title
Effects of γ-aminobutyric acid on the photosynthesis and chlorophyll fluorescence parameters of muskmelon seedlings under hypoxia stress.
- Authors
XIA Qing-ping; GAO Hong-bo; LI Jing-rui
- Abstract
By the method of hydroponic culture, this paper studied the effects of exogenous 酌鄄aminobutyric acid (GABA) on the photosynthetic pigment contents, photosynthesis, and chlorophyll fluorescence parameters of muskmelon seedlings under hypoxia stress. Hypoxia stress induced a significant decrease of photosynthetic pigment contents, resulting in the decrease of photosynthesis. Applying GABA could significantly increase the photosynthetic pigment contents, net photosynthetic rate (Pn), stomatal conductance (Gs ), intercellular CO2 concentration (Ci ), carboxylation efficiency (CE), maximal photochemical efficiency of PS 域( Fv / Fm ), photochemical quenching (qP), apparent photosynthetic electron transfer rate (ETR), and quantum yield of PS域electron transport (椎PS域), and decrease the stomatal limitation value (Ls ), minimal fluorescence (Fo ), and non鄄photochemical quenching (NPQ) under both hypoxic and normal conditions. The alleviation effect of GABA on photosynthetic characteristics was more obvious under hypoxia stress. However, simultaneously applying GABA and VGB could significantly decrease the alleviation effect of GABA under hypoxia stress.
- Publication
Yingyong Shengtai Xuebao, 2011, Vol 22, Issue 4, p999
- ISSN
1001-9332
- Publication type
Academic Journal