Effect of water stress and rewatering on the physiological and biochemical characteristics of Phalaris arundinacea

Abstract

Abstract: To investigate the responsive mechanisms and drought resistance of Phalaris arundinacea, the changes of physiological and biochemical indicators were studied over a long time, using pot-cultures under continuous artificial water stress conditions in a greenhouse. 1) During drought stress, the soil water content declined rapidly but the relative water content of leaves was not significantly reduced and was maintained at a normal level until the 12th day of drought. 2) In the process of drought stress, the soluble protein and malondialdehyde (MDA) contents increased continuously. 3) On the whole the contents of chlorophyll (Chl), chlorophyl a (Chla), carotenoid (Car) and the ratio of Chla/Chlb, Car/Chl all increased with the duration of prolonged drought. 4) In the late stages of drought stress, the chlorophyll fluorescence parameters of minimal fluorescence (Fo) and the non-photochemical quenching coefficient (NPQ) increased, while the maximal fluorescence (Fm), maximal quantum yield of PSⅡ(Fv/Fm), potential activities of PSⅡ(Fv/Fo) and photochemical quenching coefficient (qP) all decreased. 5) All the indicators were quickly restored to different degrees after rewatering. All these preliminarily results indicate that P. arundinacea has strong protection and damage repair capabilities which enable it to adapt to a high degrees of drought stress.

CLC Number:

Q945.78

SONG Jia-zhuang, LI Ping-ping, FU Wei-guo. Effect of water stress and rewatering on the physiological and biochemical characteristics of Phalaris arundinacea[J]. Acta Prataculturae Sinica, 2012, 21(2): 62-69.

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