title: A significant positive correlation between endogenous trans-zeatin content and total arsenic in arsenic hyperaccumulator Pteris cretica var. nervosa.
abstract: A pot experiment was conducted to compare the content of endogenous trans-zeatin (Z), plant arsenic (As) uptake and physiological indices in the fronds of As-hyperaccumulator (Pteris cretica var. nervosa) and non-hyperaccumulator (Pteris ensiformis). Furthermore, a stepwise regression method was used to study the relationship among determined indices, and the time-course effect of main indices was also investigated under 100mg/kg As stress with time extension. In the 100-200mg/kg As treatments, plant height showed no significant difference and endogenous Z content significantly increased in P. cretica var. nervosa compared to the control, but a significant decrease of height and endogenous Z was observed in P. ensiformis. The concentrations of As (III) and As (V) increased significantly in the fronds of two plants, but this increase was much higher in P. cretica var. nervosa. Compared to the control, the contents of chlorophyll and soluble protein were significantly increased in P. cretica var. nervosa but decreased in P. ensiformis in the 200mg/kg As treatment, respectively. A significant positive correlation was found between the contents of endogenous Z and total As in P. cretica var. nervosa, but such a correlation was not found in P. ensiformis. Additionally, in the time-course effect experiment, a peak value of each index was appeared in the 43rd day in two plants, except for chlorophyll in P. ensiformis, but this value was significantly higher in P. cretica var. nervosa than that in P. ensiformis. In conclusion, a higher endogenous Z content contributed to As accumulation of P. cretica var. nervosa under As stress.
authors.affiliation: Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan Province 650500, China.
authors.forename: Xuemei
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan Province 650500, China.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Yang
authors.affiliation: Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan Province 650500, China. Electronic address: whb1974@126.com.
authors.forename: Hongbin
authors.initials: H
authors.lastname: Wang
authors.affiliation: Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan Province 650500, China.
authors.forename: Qinchun
authors.initials: Q
authors.lastname: Li
authors.affiliation: Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan Province 650500, China.
authors.forename: Haijuan
authors.initials: H
authors.lastname: Wang
authors.affiliation: Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan Province 650500, China.
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Li
mesh_terms: D001151:Arsenic / Q000032:analysis / Q000378:metabolism* / Q000494:pharmacology*; D001673:Biodegradation, Environmental; D002734:Chlorophyll / Q000378:metabolism; D032495:Pteris / Q000737:chemistry / Q000254:growth & development / Q000378:metabolism*; D012989:Soil Pollutants / Q000378:metabolism* / Q000494:pharmacology*; D013997:Time Factors; D015026:Zeatin / Q000032:analysis / Q000378:metabolism*
chemical_list: D012989:Soil Pollutants; D002734:Chlorophyll; D015026:Zeatin; D001151:Arsenic
keywords: Arsenic; Cytokinin; Hyperaccumulator; Pteris cretica var. nervosa; Trans-zeatin