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Spatially Defined Auxin Signaling in the Marginal and Middle Domains



        ¸ÃÑо¿·¢ÏÖÖ²Îï¼¤ËØÉú³¤ËضÔҶƬԭ»ùµÄÕ¹¿ª¾ßÓÐÖØÒª×÷Ó㬽ÒʾÁËҶƬÐγɹý³ÌÖУ¬½ü-Ô¶ÖἫÐÔͨ¹ýÉú³¤ËØÐźÅͨ·½éµ¼×ª»»ÎªÖÐ-±ßÖἫÐÔ£¬´Ó¶øÊ¹Ò¶Æ¬Õ¹¿ªµÄ·Ö×Ó»úÖÆ¡£ÖµµÃÒ»ÌáµÄÊÇ£¬¸Ã³É¹ûÊǽñÄê¼Ì½¹ÓêÁå¿ÎÌâ×éÔÚ·¢ÏÖ²àÑ¿ÖиÉϸ°û½¨Á¢µÄ·Ö×Ó»úÖÆ£¨Wang et al., 2017, Plant Cell£©ºÍ½ÒʾҶƬ·Ç¶Ô³Æ·¢ÓýµÄÉúÎïÁ¦Ñ§µ÷¿Ø»úÖÆ£¨Qi et al., 2017, Nature Plants£©Ö®ºó£¬ÓÖÒ»ÖØÒªÑо¿³É¹û¡£

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MP Activates WOX1 and PRS Expression in the Marginal and Middle Domains



        ÔÚǰÆÚµÄÑо¿ÖУ¬½¹ÓêÁåÑо¿×é·¢ÏÖҶƬԭ»ùÖдæÔÚÉú³¤ËØÅ¨¶È²îÒ죬½üÖáÃæ£¨Ò¶Æ¬¿¿½ü¾¥¼âÒ»²à£¬¼´±³Ã棩Éú³¤ËØÅ¨¶ÈµÍ£¬Ô¶ÖáÃæ£¨¸¹Ã棩Éú³¤ËØÅ¨¶È¸ß£¨Qi et al., 2014, PNAS 111:18769-18774£©¡£Í¨¹ý¶ÔÉú³¤ËØ¡¢Éú³¤ËØÐźÅתµ¼Í¨Â·ÏÂÓεÄÏìÓ¦Òò×Ó½øÐо«Ï¸³ÉÏñ£¬½øÒ»²½·¢ÏÖÉú³¤ËØÓëÏÂÓÎÏìÓ¦Òò×ÓMP½ö´æÔÚ²¿·ÖÖØµþ£¬´Ó¶øÔÚ½ü-Ô¶ÖáÃæÖ®¼äµÄÖмäÇø½ç¶¨Á˸ßÉú³¤ËØÐźš£½ø¶ø£¬MP¿ÉÒÔÖ±½Ó¼¤»îWOX1ºÍPRSÔÚÖмäÇøÌØÒìµÄ±í´ï¡£WOX1ºÍPRSÊÇÖмäÇøÐγɵľö¶¨Òò×Ó£¬ÊÇҶƬÏòÁ½²àÕ¹¿ªµÄ¹Ø¼ü¡£´ËÍ⣬ҶƬԶÖáÃæÌØÒì±í´ïµÄÉú³¤ËØÍ¨Â·ÏÂÓÎÏìÓ¦Òò×ÓARF2¡¢ARF3ºÍARF4ÔòÖ±½ÓÒÖÖÆWOX1ºÍPRSÔÚÔ¶ÖáÃæÇøÓòµÄ±í´ï¡£MPºÍARF2/3/4µÄ¹²Í¬×÷ÓÃʹWOX1ºÍPRSÔÚҶƬÖмäÇøÓòÌØÒì±í´ï£¬´Ó¶øÊ¹Ò¶Æ¬Äܹ»Õ¹¿ª¡£ÉÏÊö½á¹û²ûÊöÁËҶƬÐγɹý³ÌÖУ¬½ü-Ô¶ÖἫÐÔͨ¹ýÉú³¤ËØÐźÅͨ·½éµ¼×ª»»ÎªÖÐ-±ßÖἫÐÔ£¬´Ó¶øÊ¹Ò¶Æ¬Õ¹¿ªµÄ·Ö×Ó»úÖÆ¡£¸Ã¿ÎÌâ×é×î½üµÄÁíÒ»ÏîÑо¿´ÓÉúÎïÁ¦Ñ§µÄ½Ç¶È½âÊÍÁËÖмäÇøµÄÖØÒªÐÔºÍÉú³¤ËضÔҶƬ·¢ÓýµÄµ÷¿Ø£¨Qi et al., 2017, Nature Plants 3:724-733£©¡£

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MP and ARF3 Play Antagonistic Roles in Regulating WOX1 Expression



        The flattening of leaves to form broad blades is an important adaptation that maximizes photosynthesis. However, the molecular mechanism underlying this process remains unclear. The WUSCHEL-RELATED HOMEOBOX (WOX) genes WOX1 and PRS are expressed in the leaf marginal domain to enable leaf flattening, but the nature of WOX expression establishment remains elusive. Here, we report that adaxial-expressed MONOPTEROS (MP) and abaxial-enriched auxin together act as positional cues for patterning the WOX domain. MP directly binds to the WOX1 and PRS promoters and activates their expression. Furthermore, redundant abaxial-enriched ARF repressors suppress WOX1 and PRS expression, also through direct binding. In particular, we show that ARF2 is redundantly required with ARF3 and ARF4 to maintain the abaxial identity. Taken together, these findings explain how adaxial-abaxial polarity patterns the mediolateral axis and subsequent lateral expansion of leaves.
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