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Çѱ¹½Ä¹°ÇÐȸ / v.39, no.1, 1996³â, pp.31-40
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Arabidopsis thalianaÀÇ Ethylene Triple Response Mutant¿¡¼ ¿¡Æ¿·» »ýÇÕ¼º °úÁ¤ÀÇ »ý¸® »ýÈÇÐÀû Ư¼º
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Arabidopsis thalianaÀÇ ¿¡Æ¿·» °ü·Ã µ¹¿¬º¯ÀÌüÀÎ ¿¡Æ¿·» °ú´Ù »ý¼º µ¹¿¬º¯ÀÌü(eto1-1)¿Í ¿¡Æ¿·»¿¡ ´ëÇÑ ¹ÝÀÀÀÌ µÐ°¨ÇÑ µ¹¿¬º¯ÀÌü(etr1-3°ú ein2-1)ÀÇ »ý¸®¡¤»ýÈÇÐÀû Ư¼ºÀ» ºÐ¼®ÇÏ¿´´Ù. 2¡3ÁÖµÈ Arabidopsis ½Ä¹°·ÎºÎÅÍ ¾òÀº ¼º¼÷ÇÑ ÀÙÀ» Àç·á·Î ÀÌ¿ëÇÏ¿´´Ù. ¿¡Æ¿·» »ý¼º·®Àº eto1-1Àº ¾ß»ýÇüÀÇ 2¹è, etr1-3Àº ¾ß»ýÇüÀÇ 4¹è, ±×¸®°í ein2-1Àº ¾ß»ýÇüÀÇ 4.5¹è ´õ ¸¹¾Ò´Ù. eto1-1¿¡¼ÀÇ ACC synthase¿Í ACC oxidase Ȱ¼ºÀº ¾ß»ýÇü°ú ºñ½ÁÇÏ¿´À¸³ª ACC ÇÔ·®Àº ¾ß»ýÇüº¸´Ù 4.5¹è ´õ ¸¹¾Ò´Ù. ACC-N-malo-nyltransferaseÀÇ È°¼ºÀº eto1-1ÀÌ ¾ß»ýÇüº¸´Ù 3¹è ´õ ³ô¾ÒÀ¸¸ç SAM synthetaseÀÇ È°¼ºÀº ¾ß»ýÇüº¸´Ù 1.5¹è ´õ ³ô¾Ò´Ù. ÀÌµé °á°ú·ÎºÎÅÍ eto1-1·ÎÀÇ º¯ÇüÀº SAM¿¡¼ ACC·Î ÀüȯÇÏ´Â °úÁ¤ ÀÌÀü¿¡ ÀÖÀ½À» ÃßÃøÇÒ ¼ö ÀÖ´Ù. etr1-3°ú ein2-1¿¡¼ ACC synthaseÀÇ È°¼ºÀº ¾ß»ýÇüº¸´Ù ³ô¾ÒÀ¸³ª ACC oxidaseÀÇ È°¼ºÀº ¾ß»ýÇüº¸´Ù ³·¾Ò´Ù. ±×·¯³ª SAM synthetase Ȱ¼ºÀº etr1-3¿¡¼´Â ¾ß»ýÇü°ú ºñ½ÁÇÏ¿´°í ein2-1¿¡¼´Â ¾ß»ýÇüº¸´Ù 1.7¹è ³ô¾Ò´Ù. À̰ÍÀº etr1-3°ú ein2-1ÀÌ ¿¡Æ¿·»¿¡ ´ëÇÑ ¹ÝÀÀ¿¡ °áÇÔÀÌ Àֱ⠶§¹®¿¡ ±×°ÍÀ¸·Î ÀÎÇÏ¿© ÀÚ°¡ Á¶ÀýÀÌ µÇÁö ¾Ê¾Ò±â ¶§¹®À¸·Î ÃßÁ¤µÈ´Ù. etr1-3ÀÇ ACC ÇÔ·®Àº ¾ß»ýÇüº¸´Ù 2.3¹è ´õ ¸¹¾ÒÀ¸¸ç ACC N-malonyltransferaseÀÇ È°¼ºÀº ¾ß»ýÇüº¸´Ù 3.9¹è ´õ ³ô¾Ò´Ù. ±×¸®°í ein2-1ÀÇ ACC ÇÔ·®Àº ¾ß»ýÇüº¸´Ù 1.7¹è ´õ ¸¹¾ÒÀ¸¸ç ACC N-malonyltransferaseÀÇ È°¼ºÀÌ ÃËÁøµÈ °ÍÀ¸·Î ÃßÁ¤µÈ´Ù. In vitro kinase assay¸¦ ÇÑ °á°ú eto1-1°ú ein2-1¿¡¼ 36 kDa ´Ü¹éÁúÀÇ Àλêȸ¦ °üÂûÇÒ ¼ö ÀÖ¾ú´Ù. |
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The physiological and biochemical characterizations of the ethylene-related mutants in Arabidopsis thaliana - ethylene overproducing mutant (eto1-l) and ethylene insensitive mutants (etrl-3, ein2-l) - were detailed in this studies. Two or three week.old mature rosette leaves (before bolting) were used as the plant materials. Ethylene productions of eto1-l, etrl-3, and ein2-l mutants were about 200%, 400%, and 450% compared to that of wild type, respectively. ACC synthase and ACC oxidase activities of eto1-l mutant were similar to those of wild type. ACC content and ACC N-malonyltransferase activity, however, were 4.5 times and 3 times higher than those of wild type, respectively. SAM synthetase activity increased by 50% in eto1-l mutant plant. These results indicated that the alteration in the eto1-l mutant occured before the step of the conversion of SAM to ACe. In etrl-3 and ein2-l mutants, ACC synthase activities increased, but ACC oxidase activities decreased. ACC content and ACC N-malonyltransfcrase activity were 2 times higher than those of wild type. SAM synthetase activity in etrl-3 is similar to those of wild type, while it increased by 73% in ein2-l. These results showed that the block in ethylene action affected the autoregulation of ethylene biosynthesis, so that ACC synthase activity was not autoinhibited and ACC oxidase activity was not auto stimulated by ethylene. When the leaf tissues were used for in vitro kinase assay, a cytosolic protein (approximately 36 kDa) was phosphorylated only in eto1-l and ein2-l mutants.utants. |
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Arabidopsis thaliana;ACC oxidase;ACC synthase;ethylene-related mutants;SAM synthetase; |
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Journal of Plant Biology / v.39, no.1, 1996³â, pp.31-40
Çѱ¹½Ä¹°ÇÐȸ
ISSN : 1226-9239
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO199611920118245)
¾ð¾î : Çѱ¹¾î |
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³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø |
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