title: [Effects of desulfurization waste on calcium distribution, Ca(2+)-ATPase activity, and antioxidant characteristics of rice leaf under alkali stress].
abstract: To approach the action mechanisms of desulfurization waste on alleviating alkali stress-induced injury of rice, a pot experiment was conducted to study the variations of leaf total calcium content, calcium distribution, plasma membrane Ca(2+)-ATPase activity, and reactive oxygen content of rice seedlings under alkali stress after the application of desulfurization waste. In the control, a few calcium particulates scattered in the cell wall and chloroplasts, while applying desulfurization waste or CaSO4 increased the calcium particulates in the plasma membrane, intercellular space, cell wall, and vacuole significantly. With the increasing application rate of desulfurization waste or CaSO4, the leaf total calcium content increased, Ca(2+)-ATPase activity in plasma membrane and tonoplast presented an increasing trend, plasma membrane relative permeability, MDA content, and O2 production rate decreased, and SOD and POD activities increased. The desulfurization waste could relieve the alkali stress to rice in some extent, and the main reactive compound in the waste could be CaSO4.
authors.affiliation: School of Life Science, Ningxia University, Yinchuan 750021, China.
authors.forename: Gui-Lian
authors.initials: GL
authors.lastname: Mao
authors.forename: Xing
authors.initials: X
authors.lastname: Xu
authors.forename: Jin
authors.initials: J
authors.lastname: Zeng
authors.forename: Zi-Hui
authors.initials: ZH
authors.lastname: Yue
authors.forename: Shu-Juan
authors.initials: SJ
authors.lastname: Yang
mesh_terms: D000468:Alkalies / Q000737:chemistry / Q000494:pharmacology*; D002118:Calcium / Q000378:metabolism*; D002133:Calcium Sulfate / Q000737:chemistry; D000252:Calcium-Transporting ATPases / Q000378:metabolism*; D017753:Ecosystem; D012275:Oryza / Q000378:metabolism* / Q000502:physiology; D018515:Plant Leaves / Q000378:metabolism; D012987:Soil / Q000032:analysis; D013312:Stress, Physiological / Q000502:physiology*; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D000468:Alkalies; D012987:Soil; D013482:Superoxide Dismutase; D000252:Calcium-Transporting ATPases; D002118:Calcium; D002133:Calcium Sulfate