英国剑桥大学Julian M. Hibberd团队提出单子叶植物可在胚根-茎界面处嫁接。2021年12月22日出版的《自然》发表了这项成果。
他们表明胚胎下胚轴允许在所有三个单子叶植物群中进行种内和种间移植：commelinids、lilioids 和 alismatids。他们通过组织学、外源性荧光染料的应用、内源性激素运动的互补分析以及植物生长到成熟来展示功能性移植物结合。表达谱鉴定了单子叶植物和双子叶植物嫁接相关的联合分子应答基因，以及以前与组织联合无关的基因家族。易感小麦接穗与燕麦砧木的融合赋予了对土壤传播致病菌禾本科真菌的抗性。总的来说，这些数据推翻了单子叶植物不能形成嫁接结合的共识，并将下胚轴（草中的中胚轴）确定为允许这一过程的分生组织。他们得出结论，嫁接相容性是种子植物之间的共同能力。
研究人员表示，动物和植物都可以进行嫁接。虽然在动物中这个过程需要手术并且通常与对非自我的排斥有关，但在植物中嫁接很普遍，并且自古以来就被用于作物改良。然而，在代表陆生植物第二大类并包括许多主要作物的单子叶植物中，维管形成层的缺失被认为会妨碍嫁接。
附：英文原文
Title: Monocotyledonous plants graft at the embryonic root–shoot interface
Author: Reeves, Gregory, Tripathi, Anoop, Singh, Pallavi, Jones, Maximillian R. W., Nanda, Amrit K., Musseau, Constance, Craze, Melanie, Bowden, Sarah, Walker, Joseph F., Bentley, Alison R., Melnyk, Charles W., Hibberd, Julian M.
Issue&Volume: 2021-12-22
Abstract: Grafting is possible in both animals and plants. Although in animals the process requires surgery and is often associated with rejection of non-self, in plants grafting is widespread, and has been used since antiquity for crop improvement1. However, in the monocotyledons, which represent the second largest group of terrestrial plants and include many staple crops, the absence of vascular cambium is thought to preclude grafting2. Here we show that the embryonic hypocotyl allows intra- and inter-specific grafting in all three monocotyledon groups: the commelinids, lilioids and alismatids. We show functional graft unions through histology, application of exogenous fluorescent dyes, complementation assays for movement of endogenous hormones, and growth of plants to maturity. Expression profiling identifies genes that unify the molecular response associated with grafting in monocotyledons and dicotyledons, but also gene families that have not previously been associated with tissue union. Fusion of susceptible wheat scions to oat rootstocks confers resistance to the soil-borne pathogen Gaeumannomyces graminis. Collectively, these data overturn the consensus that monocotyledons cannot form graft unions, and identify the hypocotyl (mesocotyl in grasses) as a meristematic tissue that allows this process. We conclude that graft compatibility is a shared ability among seed-bearing plants. Intra- and inter-specific grafting is possible in most orders of monocotyledonous plants, and this process could be used to combat diseases that affect crops, such as Panama disease in bananas.
DOI: 10.1038/s41586-021-04247-y
Source: https://www.nature.com/articles/s41586-021-04247-y
Nature：《自然》，创刊于1869年。隶属于施普林格·自然出版集团，最新IF：69.504
官方网址：http://www.nature.com/
投稿链接：http://www.nature.com/authors/submit_manuscript.html
本期文章：《自然》：Online/在线发表
