当前位置: 首页 > 文章 > 水稻根尖铁的积累及附着形态研究 中国生态农业学报 2009,17 (5) 929-932
Position: Home > Articles > Forms and accumulation ofiron at rice root tip Chinese Journal of Eco-Agriculture 2009,17 (5) 929-932

水稻根尖铁的积累及附着形态研究

作  者:
章艺;刘鹏;宋金敏;徐根娣;蔡妙珍;崔洁晨
单  位:
衢州学院;浙江师范大学植物学实验室
关键词:
铁;水稻;根尖;根边缘细胞;铁形态
摘  要:
以铁毒耐性水稻(Oryzasativa L.)品种"9308"为材料,利用火焰原子吸收光谱法和化学浸提法研究0~10mm段水稻根尖铁的积累及附着形态。结果表明:高Fe2+(400μmol·L-1)胁迫下,0~2mm段水稻根尖铁含量最高;随着Fe2+浓度的升高,根边缘细胞铁含量也明显增大;初生根上不同形态铁的含量为铁锰氧化物态>残渣态>有机态>可交换态>碳酸盐态。以上结果表明,水稻根尖0~2mm段是过量铁的主要作用位点,铁的附着形态以紧密结合态为主,包围在外的根边缘细胞能固定过量铁。
译  名:
Forms and accumulation ofiron at rice root tip
作  者:
ZHANG Yi1,2,LIU Peng2,SONG Jin-Min2,XU Gen-Di2,CAI Miao-Zhen2,CUI Jie-Chen2 (1.Quzhou College,Quzhou 324000,China;2.Key Laboratory for Botany,Zhejiang Normal University,Jinhua 321004,China)
关键词:
Iron,Rice,Root tip,Root border cell,Iron form
摘  要:
To explore the forms and accumulation ofiron at root tips in rice (Oryza sativa L.) under Fe2+ toxicity stress,iron-tolerant rice variety "9308" was germinated under laboratory conditions and the seedlings were treated with various Fe2+ concentrations (0~400 μmol·L?1).The content and forms ofiron at 0~10 mm root tips were measured via Flame Atomic Absorption Spectrometric and sequential extraction.Under 400 μmol·L?1 Fe2+ stress,iron content in 0~2 mm root tip is highest,while that in root border cells increases with increasing Fe2+ concentration.The order of contents of various forms ofiron in primary root is Fe-Mn oxide combined form > residual form > organometallic compound > exchangeable form> carbonate-bound form.This finding indicates that the 0~2 mm rice root tip is the main acting site of Fe2+ toxicity.Most of the irons are tightly bounded in the 0~10 mm root tip.This reduces iron phyto-availability,enabling root border cells to fix up excessive Fe2+.

相似文章

计量
文章访问数: 6
HTML全文浏览量: 0
PDF下载量: 0

所属期刊

推荐期刊