作物学报Issue(8)：1403-1411,9.DOI:10.3724/SP.J.1006.2014.01403
水稻的侧根发育及其影响因素
Rice Lateral Root Development and Its Impact Factors
摘要
Abstract
The adventitious roots and primary roots of Nipponbare and Yangdao 6 were used to measure lateral root number and the growth increment by Image J software with scanning photograph. Morphological and structural changes of lateral root primo-dia were observed by applying Spurr resin embedding and semi-thin sectioning, and light microscopy. Impacts of the lateral root emergence on the parent root structure was observed by fluorescence microscopy and scanning electron microscopy. Treatments with plant hormones, metal ions, illumination, and cutting off shoots or root tips were set up to analyse their influence on lateral root development. Results showed that rice lateral root initiation occurred from the pericycle. The endodermis also participated in the lateral root primodia formation and played protective as well as assistant roles in the process. The outward growth of lateral root primordia was realized by cell divisions of apical meristem and cell elongation at the base area. The cortex and epidermis structures of parent roots were also altered during the process of lateral root emergence. Exogenous IAA promoted the occurrence of lateral roots, but its high concentrations inhibited lateral root emergence. The number of lateral roots and growth of primary roots were significantly decreased when shoots were cut off. The apical dominance of root was lost when root tips were cut off, so that the growth of lateral roots and secondary lateral roots was accelerated. Unilateral illumination induced the increase of lateral roots in the light side. Abscisic acid at low concentrations promoted the formation of lateral roots. The formation of lateral roots and growth of primary root were promoted by Ca2+, while mostly inhibited by EDTA. The growth tendency of both adventitious roots and primary roots responsive to the treatments was basically consistent.关键词
水稻/侧根发育/中柱鞘/内皮层/生长素/光照Key words
Rice/Lateral root development/Pericycle/Endodermis/IAA/Illumination引用本文复制引用
刘大同,荆彦平,陈晶晶,余徐润,王忠..水稻的侧根发育及其影响因素[J].作物学报,2014,(8):1403-1411,9.基金项目
本研究由国家自然科学基金项目(30871467)和江苏省普通高校研究生创新基金(CXZZ11_0976)资助。 （30871467）
