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Methyl-esterification of cell wall pectin in leaf primordia



        ¹ú¼ÊѧÊõȨÍþ¿¯Îï×ÔÈ»³ö°æ¼¯ÍÅÆìÏÂ×Ó¿¯¡¶Nature Plants¡·ÔÓÖ¾ÔÚÏß·¢±íÁËÖйú¿ÆÑ§ÔºÒÅ´«Óë·¢ÓýÉúÎïѧÑо¿Ëù½¹ÓêÁåÑо¿×éÓëÖйú¿ÆÑ§ÔºÁ¦Ñ§Ñо¿ËùÁúÃãÑо¿×éºÏ×÷µÄһƪÑо¿ÂÛÎÄ£¬Ñо¿³É¹ûÌâΪ¡°Ò¶Æ¬Æ÷¹Ù·Ç¶Ô³ÆÐÔµÄÁ¦Ñ§µ÷¿Ø¡±¡£ÂÛÎı¨µÀÁ˽ÒʾҶƬ·Ç¶Ô³Æ·¢ÓýµÄÉúÎïÁ¦Ñ§µ÷¿Ø¡£½¹ÓêÁåÑо¿×鲩ʿÑо¿ÉúÆë¼ÌÑÞ(ÒѱÏÒµ)¡¢Îâ±ò±òºÍÁúÃãÑо¿×鲩ʿºó·ëÊÀÁÁ²©Ê¿Îª¸ÃÂÛÎĹ²Í¬µÚÒ»×÷Õߣ¬½¹ÓêÁåÑо¿Ô±ÓëÁúÃãÑо¿Ô±Îª¹²Í¬Í¨Ñ¶×÷Õß¡£


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[ÓÅÐãÎÄÕÂÍÆ¼ö] ÖпÆÔº½ÒʾҶƬ·Ç¶Ô³Æ·¢ÓýµÄÉúÎïÁ¦Ñ§µ÷¿Ø-1
Dynamics of cell wall pectin methyl-esterification are critical for leaf polarity patterning in tomato



        Ñо¿ÈËԱͨ¹ýѧ¿Æ½»²æÑо¿·¢ÏÖÁËÉúÎïÁ¦Ñ§ÔÚÆ÷¹ÙÐÎ×´²»¶Ô³ÆÐÔ²úÉúÖаçÑݵÄÖØÒª½ÇÉ«¡£Ñо¿±íÃ÷£¬Ò¶Æ¬±³²àÓ븹²à¼äÐźŷÖ×ӵļ«ÐÔ·Ö²¼µ¼ÖÂҶƬԭ»ùÖÐϸ°û±ÚÁ¦Ñ§ÊôÐԵIJ»¶Ô³ÆÐÔ;ϸ°û±ÚÖйû½ºµÄ¼×õ¥»¯ÐÞÊεIJ»¶Ô³ÆÐÔ²ÎÓë½éµ¼Á¦Ñ§ÊôÐԵIJ»¶Ô³ÆÐÔÐγɡ£ÀíÂÛÄ£Äâ±íÃ÷£¬Á¦Ñ§²»¶Ô³ÆÐԿɽϺýâÊÍÆ÷¹ÙÐÎ×´²»¶Ô³ÆÐԵIJúÉú;ÌØ±ðÖµµÃÒ»ÌáµÄÊÇ£¬ÈËΪ¸Ä±ä¹û½º¼×õ¥»¯ÐÞÊÎÀ´Ó°Ïìϸ°û±ÚÁ¦Ñ§ÊôÐÔµÄʵÑéÑéÖ¤ÁËÄ£ÐÍÔ¤²â£¬²¢·¢ÏÖÄܹ»¸Ä±ä±³²à/¸¹²à¼«ÐÔ»ùÒòµÄ±í´ï¡£×ÛÉÏËùÊö£¬Á¦Ñ§²»¶Ô³ÆÐÔ¿ÉÄÜÊÇÆ÷¹Ù²»¶Ô³ÆÐÔ²úÉúµÄÒ»ÖÖÆÕ±é»úÖÆ¡£

[ÓÅÐãÎÄÕÂÍÆ¼ö] ÖпÆÔº½ÒʾҶƬ·Ç¶Ô³Æ·¢ÓýµÄÉúÎïÁ¦Ñ§µ÷¿Ø-2
Epidermal restriction is necessary for polarity patterning



        How appendages, such as plant leaves or animal limbs, develop asymmetric shapes remains a fundamental question in biology. Although ongoing research has revealed the genetic regulation of organ pattern formation, how gene activity ultimately directs organ shape remains unclear. Here, we show that leaf dorsoventral (adaxial-abaxial) polarity signals lead to mechanical heterogeneity of the cell wall, related to the methyl-esterification of cell-wall pectins in tomato and Arabidopsis. Numerical simulations predicate that mechanical heterogeneity is sufficient to produce the asymmetry seen in planar leaves. Experimental tests that alter pectin methyl-esterification, and therefore cell wall mechanical properties, support this model and lead to polar changes in gene expression, suggesting the existence of a feedback mechanism for mechanical signals in morphogenesis. Thus, mechanical heterogeneity within tissue may underlie organ shape asymmetry.
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