Impacts of drought stress on physiological characteristics of Aconitums
LI Ji, ZHOU Chun-E, LIANG Zhi-Yang, MIAO Jing
1. College of Forestry,Shanxi Agricultural University,030801,Taigu,Shanxi; 2. Life Sciences Department,Henan Normal University,453007,Xinxiang,Henan；3. Life Sciences Department,Jinzhong College,030600,Jinzhong,Shanxi：China
Abstract：Using fuzzy membership method, transplanted seedlings of five Aconitums（Acotinitum kusnezoffii Reichb., A. sinomontanum Nakai,A. smithii Hand.-Mazz.,A. barbatum Pers. var. puberulum Ledeb,A. soongaricum Stapf var. angustius W.T.Wang）were selected to study the effects of drought stress on their physiological characteristics,aiming at providing a method and basis for selection of draught-resistance plants. Three soil moisture levels were designed in the experiment: control（CK）,moderate water stress（T1）,and severe water stress （T2）. The results showed: 1) The cell membrane permeability of A. sinomontanum and A. soongaricum var. angustius clearly increased only under T2,while that of A. smithii and A. barbatum var. puberulum greatly increased under both T1 and T2 treatments. The cell membrane permeability of A. kusnezoffii significantly decreased under T1 but increased under T2. 2) The MDA contents of A. sinomontanum, A. barbatum var. puberulum and A. soongaricum var. angustius were all greatly increased under the drought stress treatments,while that of A. smithii and A. kusnezoffii increased obviously only under T2 and T1 respectively. 3) The Chla contents of the Aconitums,except for A. barbatum var. puberulum,were significantly lower than that of CK. The Chlb contents of the five Aconitums varied greatly under the draught stress treatments. 4) The Pn of both A. kusnezoffii and A. sinomontanum largely decreased under T1 and T2 treatments,but there was no significant difference between those two treatments. The Pn of A. smithii decreased grealty only under T2,whereas that of A. barbatum var. puberulum increased by T1 and T2 treatments. The Pn of A. soongaricum Stapf var. angustius had no significant change under the treatments. (5) The drought tolerant ability of the five Aconitum species was determined according to the subordinate function value as: A. kusnezoffii>A. sinomontanum>A. smithii>A. soongaricum Stapf var. angustius>A. barbatum var. puberulum.
2011, Vol. 9 
