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首页> 美国卫生研究院文献>Annals of Botany >Genetic Dissection of the Initiation of the Infection Process and Nodule Tissue Development in the Rhizobium–Pea (Pisum sativum L.) Symbiosis
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Genetic Dissection of the Initiation of the Infection Process and Nodule Tissue Development in the Rhizobium–Pea (Pisum sativum L.) Symbiosis

机译：根瘤菌-豌豆（Pisum sativum L.）共生中感染过程的起始和结节组织发育的遗传解剖。

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Twelve non‐nodulating pea (Pisum sativum L.) mutants were studied to identify the blocks in nodule tissue development. In nine, the reason for the lack of infection thread (IT) development was studied; this had been characterized previously in the other three mutants. With respect to IT development, mutants in gene sym7 are interrupted at the stage of colonization of the pocket in the curled root hair (Crh– phenotype), mutants in genes sym37 and sym38 are blocked at the stage of IT growth in the root hair cell (Ith– phenotype) and mutants in gene sym34 at the stage of IT growth inside root cortex cells (Itr– phenotype). With respect to nodule tissue development, mutants in genes sym7, sym14 and sym35 were shown to be blocked at the stage of cortical cell divisions (Ccd– phenotype), mutants in gene sym34 are halted at the stage of nodule primordium (NP) development (Npd– phenotype) and mutants in genes sym37 and sym38 are arrested at the stage of nodule meristem development (Nmd– phenotype). Thus, the sequential functioning of the genes Sym37, Sym38 and the gene Sym34 apparently differs in the infection process and during nodule tissue development. Based on these data, a scheme is suggested for the sequential functioning of early pea symbiotic genes in the two developmental processes: infection and nodule tissue formation.
机译：研究了十二个非结节豌豆（Pisum sativum L.）突变体，以鉴定结节组织发育中的障碍。在九个案例中，研究了缺乏感染线程（IT）发展的原因；以前在其他三个突变体中已对此进行了表征。关于IT的发展，sym7基因的突变体在卷曲的根毛囊定殖阶段（Crh – 表型）被打断，sym37和sym38基因的突变体在卷曲阶段被阻断。根毛细胞中的IT生长（Ith – 表型）和基因sym34中的突变体在根皮层细胞内部的IT生长阶段（Itr – 表型）。关于结节组织的发育，基因sym7，sym14和sym35的突变体在皮质细胞分裂阶段（Ccd – 表型）被阻止，而基因sym34的突变体在皮层细胞分裂阶段被阻止。结节原基（NP）发育（Npd – 表型）和基因sym37和sym38中的突变体在结节分生组织发育阶段（Nmd – 表型）被阻滞。因此，在感染过程中和结节组织发育过程中，基因Sym37，Sym38和基因Sym34的顺序功能显然不同。根据这些数据，提出了在两个发育过程中豌豆早期共生基因的顺序功能的计划：感染和结节组织形成。

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