断主根对花生幼苗根系生长的影响

Effect of Main Root Cutting on Root Growth of Peanut Seedlings

摘要: 在实验室可控环境条件下，以青花6号和青花7号花生品种为材料，系统研究了不同主根长度时断根尖对花生幼苗根系生长的影响。研究结果表明：花生幼苗不同主根长度时断根尖后，主根基本不再伸长；主根5 cm时断根尖可促进侧根生长，增加侧根数量和侧根长度，其它主根长度断根尖均不利于侧根生长；随主根长度增加，断根尖对总根长和根表面积的影响减少，主根15 cm时断根尖总根长和根表面积与对照相当。

Abstract: The effects of broken root tips on root growth of peanut seedlings with different main root lengths were systematically studied with peanut varieties “Qinghua 6” and “Qinghua7” as material under controlled environmental conditions in the laboratory. The results showed that when the root tips of peanut seedlings were broken with different main root lengths, the main root was basically no longer elongated; when the main roots were 5 cm, breaking the root tip could promote the lateral root growth, increase the number and length of the lateral root. However, breaking root tip at other main root length was not conducive to lateral root growth. With the increase of the main root length, the influences of the broken root tip on the total root length and root surface area decreased. The root tip was broken when the main root was 15 cm long, the total root length and root surface area were equivalent to the control.