CN110859131B - 甘薯四倍体野生种根直接再生为植株的方法 - Google Patents

甘薯四倍体野生种根直接再生为植株的方法 Download PDF

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CN110859131B
CN110859131B CN201911280025.0A CN201911280025A CN110859131B CN 110859131 B CN110859131 B CN 110859131B CN 201911280025 A CN201911280025 A CN 201911280025A CN 110859131 B CN110859131 B CN 110859131B
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张安
曹清河
戴习彬
袁蕊
周志林
赵冬兰
唐君
苏一钧
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Jiangsu Xuhuai District Xuzhou Agricultural Research Institute (jiangsu Xuzhou Sweet Potato Research Center)
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    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
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    • AHUMAN NECESSITIES
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Abstract

本发明公开了一种甘薯四倍体野生种根直接再生为植株的方法。所述方法先将甘薯四倍体野生种Ipomoea tabascana茎段置于MS培养基上培养生根后,截取整条根作为外植体接种于MS培养基上,在25±1℃、光照16小时/天的条件下培养7~10天,根前端区域开始膨大,并逐渐分化出芽,进而形成植株;待植株生长10~15天后再转入MS培养基上,光照16小时/天的条件下进行继代培养3~7天,最终获得完整再生植株。本发明能够将甘薯四倍体野生种Ipomoea tabascana一步诱导成苗,并且再生率高,达到90.0%,植株再生时间较短,普遍为20~30天。

Description

甘薯四倍体野生种根直接再生为植株的方法
技术领域
本发明属于植株再生方法技术领域,涉及一种甘薯四倍体野生种根直接再生为植株的方法。
背景技术
目前,栽培种甘薯(Ipomoea batatas L.(Lam),六倍体)及少数野生种(二倍体)的再生方法多使用叶片、茎段、顶端分生组织等作为外植体,经愈伤形成再生植株。例如吴洁等剥离甘薯茎尖分生组织在含有2,4-D的MS培养上诱导胚性愈伤,再经悬浮培养40周以后转移至含有ABA的培养基上诱导植株再生(吴洁,郑雪莲,屈会娟,李明,阎文昭.高淀粉专用型甘薯品种悬浮体系的建立及植株再生[J].西南农业学报,2013,26(01):52-56.)。周志林等研究了商薯19的茎段、叶片、叶柄的再生能力,结果表明芽分化率只有50%左右(周志林,唐君,张允刚,赵冬兰.不同基因型甘薯愈伤组织诱导及植株再生[J].西北农业学报,2010,19(09):203-206.)。刘爱华等对野生种Ipomoea littoralis的再生研究表明,叶片、叶柄在含有2,4-D、KT的培养基上诱导出愈伤组织,然后转移到MS培养上可诱导成苗,植株再生率约50%(刘爱华,张志芬,徐丽娟,孟祥霞.甘薯近缘野生种Ipomoea littoralis Blune叶片、叶柄愈伤组织诱导及其植株再生[J].莱阳农学院学报,1999(01):44-46.)。上述方法普遍存在以下问题:培养条件较为复杂,需要多种培养基持续诱导;培养周期较长,通常需要半年以上的时间;再生效率低。
Ipomoea tabascana是栽培种甘薯亲缘关系较近的四倍体野生种之一,不能像甘薯一样形成块根。但是它在甘薯起源、进化过程中起到重要的作用。深入研究I.tabascana对甘薯研究有着重要作用。目前还没有其植株再生方面的研究报道。
发明内容
为了弥补甘薯四倍体野生种植株再生方法的空白,本发明提供一种甘薯四倍体野生种根直接再生为植株的方法,该方法培养条件简单,周期短,效率高。
本发明的技术方案是:
甘薯四倍体野生种根直接再生为植株的方法,包括以下步骤:
将甘薯四倍体野生种Ipomoea tabascana茎段置于MS培养基上培养1个月,截取整条根作为外植体接种于MS培养基上,在25±1℃、光照16小时/天的条件下培养7~10天,根前端区域开始膨大,并逐渐分化出芽,进而形成植株;待植株生长10~15天后,将其转入MS培养基上,光照16小时/天的条件下进行继代培养3~7天,获得完整再生植株。
在本发明的具体实施方式中,所述的茎段的长度为1~2cm。
在本发明的具体实施方式中,所述的MS培养基的组成包括MS基本培养基,蔗糖30g/L和Phytagel 7.0g/L;pH为5.8~6.0。
在本发明的具体实施方式中,所述的光照强度为2500Lux。
本发明方法能够将甘薯四倍体野生种Ipomoea tabascana一步诱导成苗,并且再生率高,达到90.0%,植株再生时间较短,普遍为20~30天。本发明方法可操作性强、重复性好。
附图说明
图1是Ipomoea tabascana的根前端部分开始膨大的实物图。
图2是Ipomoea tabascana的根膨大后开始分化出芽的实物图。
图3是Ipomoea tabascana再生植株的实物图。
具体实施方式
下面结合实施例和附图对本发明作进一步详述。
1.试验材料和方法
(1)试验材料:甘薯四倍体野生种:Ipomoea tabascana。
(2)试验方法:所选材料均来自继代培养的Ipomoea tabascana组培苗。在超净工作台中用剪刀将茎剪切成1~2cm大小的茎段,接种于MS培养基中生根(MS基本培养基+蔗糖30g/L+Phytagel(植物凝胶)7.0g/L;pH:5.8~6.0)。培养1个月后,截取整条根接种于MS培养基(MS基本培养基+蔗糖30g/L+Phytagel 7.0g/L;MS基本培养基+6-BA 2mg/+NAA0.1mg/L+蔗糖30g/L+Phytagel 7.0g/L为对照;pH:5.8~6.0),诱导出芽;待芽分化后,继续培养15~20天,形成再生植株;将再生植株转入MS培养基(MS基本培养基+蔗糖30g/L+Phytagel7.0g/L;pH:5.8~6.0)生根,形成完整植株。每组重复10条根,共计3个重复。培养条件为:25±1℃,光照16小时/天,日光灯冷光源强度为2500Lux。
(3)调查及数据统计:根接种在MS培养基上30天,统计芽分化率、植株再生率;同时转入MS培养基继续培养生根。
2.结果与分析
(1)不同诱导培养基对茎尖诱导及植株再生的影响
研究发现,在7天调查时,Ipomoea tabascana根已有芽的分化,并很快形成再生植株。具体结果见表1:与培养基中添加6-BA 2.0mg/L+NAA 0.1mg/L的对照组相比,不添加激素的培养基中的Ipomoea tabascana的芽分化率及植株再生率都得到了显著的提高,芽分化率最高达80.0%,植株再生率为90%(见表1)。
表1不同培养基配方对芽分化率及植株再生率的影响
Figure BDA0002316499110000031
*注:芽分化率=芽分化根数/总根数*100%;植株再生率=再生植株数/芽数*100%
综上,本发明以甘薯四倍体野生种Ipomoea tabascana为材料,以根作为外植体,在不需要添加激素的培养基上即可再生为植株,操作简单,效率高,时间短,重复性好。

Claims (3)

1.甘薯四倍体野生种根直接再生为植株的方法,其特征在于,包括以下步骤:
将甘薯四倍体野生种Ipomoea tabascana茎段置于MS培养基上培养1个月,截取整条根作为外植体接种于MS培养基上,在25±1℃、光照16小时/天的条件下培养7~10天,根前端区域开始膨大,并逐渐分化出芽,进而形成植株;待植株生长10~15天后,将其转入MS培养基上,光照16小时/天的条件下进行继代培养3~7天,获得完整再生植株;所述的MS培养基由MS基本培养基、蔗糖30 g/L和Phytagel 7.0g/L组成,pH为5.8~6.0。
2.根据权利要求1所述的方法,其特征在于,所述的茎段的长度为1~2cm。
3.根据权利要求1所述的方法,其特征在于,所述的光照强度为2500 Lux。
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Citations (2)

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CN109526946A (zh) * 2018-11-29 2019-03-29 江苏徐淮地区徐州农业科学研究所(江苏徐州甘薯研究中心) 一种甘薯及其近缘种的实生种子的保存方法

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