title: [Comparative analysis of endogenous hormones between two species of Ammopiptanthus seedlings around germination and under Pb2+ stress].
abstract: The changes in three endogenous hormones, phytohormones gibberrelic acid (GA3), indoles-3-acid (IAA) and abscisic acid (ABA), were studied around germination and under tress of different density of Pb2+ between two species of Ammopiptanathus. It was found that (1) around germination, in Xinjiang Ammopiptanthus the rate IAA decreased 77.80%, and the rate of ABA decreased 98.90%; and in Mongolia Ammopiptanthus the rate of IAA decreased 75.80%, the rate of ABA decreased 66.20%, and the GA3 contents in both had no big change. (2) With the increase in Pb2+ concentration (20-1 500 mg x L(-1)), the IAA decreased significantly; and only under the high density (more than 1 000 mg x L(-1)) of Pb2+, the GA3 was affected by it; the ABA did not change regularly. So the three endogenous hormone levels of Mongolia Ammopiptanthus were higher than those of Xinjiang Ammopiptanthus. (3) the distributions of Pb2+ in Ammopiptanthus seedlings are the root > stems > leaves. (4) the stress of high concentration of Pb2+ damages irreversibly the leaf cells of Ammopiptanthus. This study can provide the basis of reference data for further research on the growth characteristics, resilience and the mechanism of specific broad-leaved evergreen shrubs-Ammopiptanthus in desertification area.
authors.affiliation: Grassland and Environmental Science College of Xinjiang Agricultural University, Urumqi 830052, China. zcx2310@126.com
authors.forename: Chun-Xia
authors.initials: CX
authors.lastname: Zheng
authors.forename: Bo-Lang
authors.initials: BL
authors.lastname: Chen
authors.forename: Hong-Tao
authors.initials: HT
authors.lastname: Jia
authors.forename: Jian-Dong
authors.initials: JD
authors.lastname: Sheng
authors.forename: Xin-Yan
authors.initials: XY
authors.lastname: Pan
mesh_terms: D000040:Abscisic Acid / Q000032:analysis; D007887:Fabaceae / Q000737:chemistry* / Q000145:classification; D018525:Germination; D005875:Gibberellins / Q000032:analysis; D007210:Indoleacetic Acids / Q000032:analysis; D007854:Lead; D010937:Plant Growth Regulators / Q000032:analysis*; D018515:Plant Leaves; D018517:Plant Roots; D036226:Seedlings; D013312:Stress, Physiological
chemical_list: D005875:Gibberellins; D007210:Indoleacetic Acids; D010937:Plant Growth Regulators; D007854:Lead; C030737:indoleacetic acid; D000040:Abscisic Acid; C007842:gibberellic acid