Cao Xiu, Xia Ren-Xue, Zhang De-Jian, Shu Bo
Ministry of Education Key Laboratory of Horticultural Plant Biology, Huazhong Agricultural University, Wuhan 430070, China.
Ying Yong Sheng Tai Xue Bao. 2013 Jun;24(6):1525-30.
Ahydroponics experiment was conducted to study the effects of nutrients (N, P, K, Ca, Mg, Fe, and Mn) deficiency on the length of primary root, the number of lateral roots, and the root hair density, length, and diameter on the primary root and lateral roots of Poncirus trifoliata seedlings. Under the deficiency of each test nutrient, root hair could generate, but was mainly concentrated on the root base and fewer on the root tip. The root hair density on lateral roots was significantly larger than that on primary root, but the root hair length was in adverse. The deficiency of each test nutrient had greater effects on the growth and development of root hairs, with the root hair density on primary root varied from 55.0 to 174.3 mm(-2). As compared with the control, Ca deficiency induced the significant increase of root hair density and length on primary root, P deficiency promoted the root hair density and length on the base and middle part of primary root and on the lateral roots significantly, Fe deficiency increased the root hair density but decreased the root hair length on the tip of primary root significantly, K deficiency significantly decreased the root hair density, length, and diameter on primary root and lateral roots, whereas Mg deficiency increased the root hair length of primary root significantly. In all treatments of nutrient deficiency, the primary root had the similar growth rate, but, with the exceptions of N and Mg deficiency, the lateral roots exhibited shedding and regeneration.
进行了一项水培实验，以研究养分（氮、磷、钾、钙、镁、铁和锰）缺乏对枳椇幼苗主根长度、侧根数量以及主根和侧根上根毛密度、长度和直径的影响。在每种测试养分缺乏的情况下，根毛都能产生，但主要集中在根部，根尖处较少。侧根上的根毛密度显著大于主根上的根毛密度，但根毛长度则相反。每种测试养分的缺乏对根毛的生长发育都有较大影响，主根上的根毛密度在55.0至174.3 mm(-2)之间变化。与对照相比，缺钙导致主根上根毛密度和长度显著增加，缺磷显著促进主根基部和中部以及侧根上的根毛密度和长度，缺铁增加了主根尖端的根毛密度但显著降低了根毛长度，缺钾显著降低了主根和侧根上的根毛密度、长度和直径，而缺镁显著增加了主根的根毛长度。在所有养分缺乏处理中，主根的生长速率相似，但除了氮和镁缺乏外，侧根表现出脱落和再生。
