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- W2359557399 abstract "Samples of Alhagi sparsifolia and Nitraria roborowskii leaves were colleted on the south fringe of the Taklimakan desert.At different relative water contents(RWC),we investigated the characteristics of the water potential(ψw),stomatal conductance(Gs) and chlorophyll fluorescence parameters changes.The results indicated that:(1)Under the dehydration stress,the initial Gs value of N.roborowskii was high as 495.7 mmol·m-2·s-1 and decreased slowly when RWC above 96%;While A.sparsifolia's stoma responded quickly to the dehydration stress,it could control the Gs value in 180 mmol·m-2·s-1 and had a generally slow decrease.(2)N.roborowskii's initial water potential was higher than A.sparsifolia's and could maintain some stability in extent,but when RWC below 84%,its ψw began to decrease strongly under the level of A.sparsifolia's,which always maintained more slowly.(3)The two's leaves Gs to absolute ψw showed negative exponential regression relationship and there was a critical point of ψw to Gs of N.roborowskii as-2.2 Mpa,but A.sparsifolia had no clear point.(4)On the natural dehydration,both two showed F0 rose significantly,Fv/Fm,Fv/F0 values decreased.N.roborowskii had more severe damage to reaction centers,but A.sparsifolia's Fv/Fm value more than 0.1 until RWC was 55%,indicating it's PSⅡ reaction centers itself was stable,meanwhile,its TRo/RC,RC/CSo values posed fluctuate and its RC/CSo changed insignificantly.N.roborowskii's fluorescence specific activity values increased suddenly and the fluorescence curves distorted when RWC less than 78%.In summary,A.sparsifolia posed low water potential to tolerate dehydration and it may exist reaction centers lose activity reversible and energy trap to carry on heat dissipation and respond water stress,while N.roborowskii showed maintain high water potential to delay dehydration and its RWC point which stands for water stress utmost threshold was 78%.In all,A.sparsifolia as local dominant species have a better adaptability and tolerance and N.roborowskii is not suitable for the area to introduce and spread where or long term consistent drought or groundwater level fluctuates strongly exist." @default.
- W2359557399 created "2016-06-24" @default.
- W2359557399 creator A5064368100 @default.
- W2359557399 date "2013-01-01" @default.
- W2359557399 modified "2023-09-27" @default.
- W2359557399 title "Characteristics of Leaf Dehydration on Water Relation and Photosystem II Activity in Two Desert Plants" @default.
- W2359557399 hasPublicationYear "2013" @default.
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