Casimiro Ilda, Beeckman Tom, Graham Neil, Bhalerao Rishikesh, Zhang Hanma, Casero Pedro, Sandberg Goran, Bennett Malcolm J
Departmento de Ciencias Morfologicas Y Biologia, University of Extremadura, Badajoz, Spain.
Trends Plant Sci. 2003 Apr;8(4):165-71. doi: 10.1016/S1360-1385(03)00051-7.
Recent studies in the model plant Arabidopsis provide new insight into the regulation of root architecture, a key determinant of nutrient- and water-use efficiency in crops. Lateral root (LR) primordia originate from a subset of pericycle founder cells. Sophisticated mass-spectroscopy-based techniques have been used to map the sites of biosynthesis of auxin and its distribution in Arabidopsis seedlings, highlighting the importance of the phytohormone during LR initiation and emergence. Key components of the cell cycle and signal-transduction pathway(s) that promote and attenuate auxin-dependent LR initiation have recently been identified. Additional signals, such as abscisic acid and nitrate, also regulate LR emergence, raising intriguing questions about the cross-talk between their transduction pathways.
近期在模式植物拟南芥上的研究为根系结构的调控提供了新见解，而根系结构是作物养分利用效率和水分利用效率的关键决定因素。侧根原基起源于中柱鞘起始细胞的一个子集。基于质谱的精密技术已被用于绘制生长素的生物合成位点及其在拟南芥幼苗中的分布，凸显了这种植物激素在侧根起始和长出过程中的重要性。最近已经鉴定出了促进和减弱生长素依赖性侧根起始的细胞周期和信号转导途径的关键组分。其他信号，如脱落酸和硝酸盐，也调节侧根长出，这引发了关于它们的转导途径之间相互作用的有趣问题。
