牛血清白蛋白对连香树扦插繁殖的影响
2016-01-08黄绍辉刘艳
黄绍辉+刘艳



摘要:为探讨牛血清白蛋白(BSA)与植物扦插苗根系发育的关系,以濒危植物连香树(Cercidiphyllum japonicum)为试验材料, 研究不同浓度外源BSA对连香树扦插苗的生理和形态响应。结果表明,BSA浓度低于7.58 μmol/L时,与对照相比,提高了扦插苗的生根率、显著增加侧根数和平均根长,使植物内源赤霉素(GA)、脱落酸(ABA)、玉米素(ZR)和生长素(IAA)含量的变化向有利于根系形成和生长的方向变化,对扦插苗不定根形成有不同程度的促进作用。而高浓度BSA(≥15.15 μmol/L)处理与对照相比,降低了扦插苗的生根率、显著减少侧根数和平均根长,使植物内源GA、ABA、ZR和IAA含量向不利于根系形成和生长的方向变化,对扦插苗不定根形成有不同程度的抑制作用。
关键词:牛血清白蛋白;连香树(Cercidiphyllum japonicum);扦插繁殖;根系;植物内源激素
中图分类号:Q949.746.4;S615 文献标识码:A 文章编号:0439-8114(2015)23-5922-04
DOI:10.14088/j.cnki.issn0439-8114.2015.23.032
Effects of Bovine Serum Albumin on Propagation of Cercidiphyllum japonicum Cutting
HUANG Shao-hui,LIU Yan
(College of Environmental Engineering, Xuzhou Institute of Technology, Xuzhou 221008, Jiangsu, China)
Abstract:Endangered plant Cercidiphyllum japonicum was used to investigate the relationship between bovine serum albumin (BSA) and the development of plant cuttings root system. Physiological and morphological responses to exogenous BSA of different concentrations were studied. The results showed that applying appropriate BSA(≤7.58 μmol/L) was able to increase the cutting root rate and lateral root number and average length of root,enhance root activity and conducive the plant endogenous GA,ABA,ZR and IAA content changed in the direction of promoting the growth of roots and adventitious root formation of cuttings. However,high concentrations of BSA(≥15.15 μmol/L) have different extent inhibition effects,and reduce the number of lateral roots,average root length and rooting rate than the control,and the plant endogenous GA,ABA,ZR and IAA content changed in the direction of inhibiting adventitious root formation and the growth of root in different degrees.
Key words:bovine serum albumin;Cercidiphyllum japonicum;cutting propagation;root system;plant endogenous hormone
连香树(Cercidiphyllum japonicum)为国家二级濒危保护植物,在系统演化中处于比较原始的地位[1]。其居群间基因交流困难[2],为短时间短距离风媒传粉[3],在干旱胁迫下,连香树种子萌发和幼苗生长受到抑制[4]。开展连香树的有性繁殖和无性繁殖研究,对于保护和发展该濒危物种种质资源具有重要的意义。
本试验采用蛭石、珍珠岩和河沙组成连香树嫩枝扦插的培养基,以无菌水处理的作为对照,探讨连香树插穗对不同浓度牛血清白蛋白(BSA)浸泡处理的形态和生理反应,为评估蛋白质如何影响植物扦插繁殖生根提供基础资料。
1 材料与方法
1.1 材料
连香树插穗于2014年3月1日采自南京中山植物园。……
