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首页> 外文期刊>Plant Cell Reports >Ectopic expression of class 1 KNOX genes induce adventitious shoot regeneration and alter growth and development of tobacco (Nicotiana tabacum L) and European plum (Prunus domestica L)
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Ectopic expression of class 1 KNOX genes induce adventitious shoot regeneration and alter growth and development of tobacco (Nicotiana tabacum L) and European plum (Prunus domestica L)

机译:1类KNOX基因的异位表达诱导不定芽再生,并改变烟草(Nicotiana tabacum L)和欧洲李子(Prunus domestica L)的生长发育

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摘要

Transgenic plants of tobacco (Nicotiana tabacum L) and European plum (Prunus domestica L) were produced by transforming with the apple class 1 KNOX genes (MdKN1 and MdKN2) or corn KNOX1 gene. Transgenic tobacco plants were regenerated in vitro from transformed leaf discs cultured in a medium lacking cytokinin. Ectopic expression of KNOX genes retarded shoot growth by suppressing elongation of internodes in transgenic tobacco plants. Expression of each of the three KNOX1 genes induced malformation and extensive lobbing in tobacco leaves. In situ regeneration of adventitious shoots was observed from leaves and roots of transgenic tobacco plants expressing each of the three KNOX genes. In vitro culture of leaf explants and internode sections excised from in vitro grown MdKN1 expressing tobacco shoots regenerated adventitious shoots on MS (Murashige and Skoog 1962) basal medium in the absence of exogenous cytokinin. Transgenic plum plants that expressed the MdKN2 or corn KNOX1 gene grew normally but MdKN1 caused a significant reduction in plant height, leaf shape and size and produced malformed curly leaves. A high frequency of adventitious shoot regeneration (96%) was observed in cultures of leaf explants excised from corn KNOX1-expressing transgenic plum shoots. In contrast to KNOX1-expressing tobacco, leaf and internode explants of corn KNOX1-expressing plum required synthetic cytokinin (thidiazuron) in the culture medium to induce adventitious shoot regeneration. The induction of high-frequency regeneration of adventitious shoots in vitro from leaves and stem internodal sections of plum through the ectopic expression of a KNOX1 gene is the first such report for a woody perennial fruit trees.
机译:烟草(Nicotiana tabacum L)和欧洲李子(Prunus domestica L)的转基因植物是通过转化苹果1类KNOX基因(MdKN1和MdKN2)或玉米KNOX1基因而产生的。从在缺乏细胞分裂素的培养基中培养的转化的叶盘在体外再生转基因烟草植物。 KNOX基因的异位表达通过抑制转基因烟草植物中节间的伸长而延缓了芽的生长。三种KNOX1基因各自的表达诱导了烟草叶片的畸形和广泛的叶裂。从表达三个KNOX基因的每一个的转基因烟草植物的叶和根中观察到不定芽的原位再生。在没有外源细胞分裂素的情况下,在MS(Murashige and Skoog 1962)基础培养基上,从表达MdKN1的体外生长的表达烟草芽的叶片外植体和节间节的体外培养物中再生不定芽。表达MdKN2或玉米KNOX1基因的转基因李子植物正常生长,但MdKN1导致植物高度,叶片形状和大小显着降低,并产生畸形的卷曲叶片。在从表达玉米KNOX1的转基因李子芽中摘下的叶片外植体培养物中,观察到不定芽的再生频率很高(96%)。与表达KNOX1的烟草相反,表达玉米KNOX1的李子的叶和节间外植体在培养基中需要合成细胞分裂素(噻二唑酮)来诱导不定芽再生。通过多年生木本多年生果树的首次报道,通过异位表达KNOX1基因诱导李子的叶片和茎间节的高频不定芽再生。

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