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博士毕业于华中农业大学,华中农大教授以通讯作者在1区Top期刊发表研究成果

  • 2026-02-09 03:20:58
博士毕业于华中农业大学,华中农大教授以通讯作者在1区Top期刊发表研究成果

近日,华中农业大学园艺林学学院黄远教授课题组合作在Plant Physiology期刊上发表题为“Xyloglucan endotransglucosylase/hydrolase family genes are required for the plant graft union formation through callus proliferation”的研究论文。华中农业大学园艺林学学院已毕业硕士研究生熊木(现为名古屋大学在读博士生)为论文第一作者,黄远教授和Michitaka Notaguchi教授为共同通讯作者。

研究团队首先对多种甜瓜(Cucumis melo)接穗和葫芦(Lagenaria siceraria))砧木的嫁接亲和性进行了系统性的评价,发现甜瓜与葫芦存在普遍的嫁接低亲和性现象,即嫁接后植株虽能存活,但生长停滞。进一步的染料运输实验和组织切片观察表明,愈合部韧皮部的胼胝质沉积是导致甜瓜与葫芦低亲和性的直接原因。胼胝质的沉积阻碍了甜瓜接穗的光合产物向砧木的运输,限制了砧木根系成长;而有限的根系生长又无法为接穗提供足够的水分和营养物质支撑,最终导致“僵而不死”的典型低亲和性表型。值得注意的是,低亲和性葫芦砧木诱导甜瓜接穗在嫁接界面产生更多愈伤组织。

对甜瓜/甜瓜与甜瓜/葫芦的嫁接愈合部转录组进行进一步分析,发现与甜瓜自嫁相比,低亲和性组合的基因表达发生更大幅度偏移,且差异基因主要富集在细胞壁合成与修饰相关通路。进一步的生信分析发现,XTH9为关键响应基因。沉默甜瓜CmXTH9后,甜瓜嫁接苗成活率显著降低,愈伤组织形成明显受阻,且在甜瓜/葫芦组合中表现尤为突出,证明其在嫁接愈合中的重要功能。

沉默甜瓜CmXTH9对甜瓜/葫芦嫁接愈合的影响

随后,研究人员进一步比较了甜瓜、拟南芥、烟草、水稻、番茄等多物种嫁接愈合部转录组,发现25%-55%的XTH家族基因在嫁接愈合过程中被上调,且上调的成员分布在XTH家族的不同亚群中。相对于嫁接亲和性组合,弱亲和性组合表现出更多的成员被上调,且上调幅度更高,而嫁接不亲和组合则仅有一个甚至没有XTH被上调。为验证XTH家族基因在其他物种嫁接中的功能,研究人员对拟南芥AtXTH4和AtXTH7进行研究。二者均在拟南芥嫁接愈合部的愈伤组织中表达。单突变Atxth4和Atxth7对愈伤形成和嫁接成活没有影响,而双突变显著降低愈伤组织的形成和嫁接成活。

上述结果表明,XTH家族基因通过促进愈伤组织的形成,进而增强嫁接愈合。在低亲和砧木嫁接条件时,接穗则通过进一步增强愈伤组织的形成的策略,来保证自身的成活。这种机制在不同物种嫁接中具有保守性,且来自不同分支的多个XTH成员的参与能够在最大程度上,减少单一基因的功能缺失对嫁接愈合的影响。

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  1. CONNECT:[ UseTime:0.000720s ] mysql:host=127.0.0.1;port=3306;dbname=h_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000883s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.005989s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003189s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000882s ]
  6. SELECT * FROM `set` [ RunTime:0.000289s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000658s ]
  8. SELECT * FROM `article` WHERE `id` = 468974 LIMIT 1 [ RunTime:0.009472s ]
  9. UPDATE `article` SET `lasttime` = 1770712810 WHERE `id` = 468974 [ RunTime:0.002671s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000287s ]
  11. SELECT * FROM `article` WHERE `id` < 468974 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001552s ]
  12. SELECT * FROM `article` WHERE `id` > 468974 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.015842s ]
  13. SELECT * FROM `article` WHERE `id` < 468974 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.018824s ]
  14. SELECT * FROM `article` WHERE `id` < 468974 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.068652s ]
  15. SELECT * FROM `article` WHERE `id` < 468974 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008358s ]
0.233881s