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Çѱ¹È¯°æ»ý¹°ÇÐȸ / v.18, no.3, 2000³â, pp.331-336
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( Effects of Various Environmental Stresses on the Peroxidase Activities from Rice Seedlings )
ÀÌÁ¤¾Ö;½ÅÇö¿õ;À̹̿µ; KIST µµÇÎÄÜÆ®·Ñ ¼¾ÅÍ;¼øÃµÇâ´ëÇб³ »ý¸í°úÇкÎ;¼øÃµÇâ´ëÇб³ »ý¸í°úÇкÎ;
 
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»ê¼ººñÀÇ ÁÖ¿ä ¼ººÐÀÎ So$_2$°¡ peroxidase Ȱ¼º¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» Á¶»çÇϱâ À§ÇÏ¿© ´Ù¾çÇÑ ³óµµÀÇ $Na_2$SO$_3$¸¦ Æ÷ÇÔÇÑ ¹èÁö¿¡¼­ º­(Oryza sativa) seedlingÀ» ¹è¾çÇÏ¿´´Ù. $Na_2$SO$_3$´Â º±¾¾ÀÇ ¹ß¾Æ¸¦ ¾ïÁ¦½ÃÄ×À¸¸ç, º±¾¾ÀÇ ¹ß¾ÆÀ²À» 50%°¨¼Ò½Ã۴µ¥ ÇÊ¿äÇÑ $Na_2$SO$_3$ÀÇ ³óµµ°¡ pH 7¿¡¼­´Â 300$mu extrm{g}$/ml, PH5¿¡¼­´Â 8$mu extrm{g}$/ml À̾úÀ¸³ª, pH 3¿¡¼­´Â 2$mu extrm{g}$/ml¿¡ ºÒ°úÇÏ¿´´Ù. $Na_2$SO$_3$¿¡ ÀÇÇÑ peroxidaseÀÇ È°¼ºº¯È­¸¦ Á¶»çÇßÀ» ¶§ 2$mu extrm{g}$/ml $Na_2$SO$_3$(pH 3)¿¡ ÀÇÇÏ¿© È¿¼ÒȰ¼ºÀÌ ¾à 4¹è Áõ°¡ÇÏ¿´°í, 8$mu extrm{g}$/ml $Na_2$SO$_3$(pH 5)¿¡ ÀÇÇÏ¿© È¿¼ÒȰ¼ºÀÌ ¾à 8¹è Áõ°¡ÇÏ¿´´Ù. ¶ÇÇÑ È¯°æ¿À¿°¿øÀÇ Áֿ伺ºÐÀÎ Cd°ú PbÀÌ º­ peroxidaseȰ¼º°ú ¿±·Ï¼Ò ÇÔ·®¿¡ ¹ÌÄ¡´Â È¿°ú¸¦ Á¶»çÇÏ¿´´Ù. 0.03mM Cd󸮱ºÀÇ °æ¿ì peroxidaseȰ¼ºÀÌ 3.9¹è Áõ°¡ÇÏ¿´À¸³ª ¿±·Ï¼Ò ÇÔ·®Àº ´ëÁ¶±ºÀÇ 63%·Î °¨¼ÒÇÏ¿´´Ù. 0.04mM Pb󸮱ºÀÇ °æ¿ì 2.5¹èÀÇ peroxidase Ȱ¼ºÁõ°¡¸¦ º¸¿´À¸³ª ¿±·Ï¼Ò ÇÔ·®Àº ´ëÁ¶±ºÀÇ 72%·Î °¨¼ÒÇÏ¿´´Ù. »Ó¸¸ ¾Æ´Ï¶ó ¼¼Æ÷³»¿¡¼­ Ȱ¼º»ê¼ÒÀÇ »ý¼ºÀ» À¯µµÇÔÀ¸·Î½á »êÈ­Àû ½ºÆ®·¹½º¸¦ À¯¹ßÇÏ´Â ¹°ÁúÀÎ Cu¿Í FeÀÌ peroxidaseȰ¼º¿¡ ¹ÌÄ¡´Â È¿°ú¸¦ »ìÆìº¸¾Ò´Ù. 0.5mM CuSO$_4$¿Í 0.5mM FeS0$_4$¿¡ ÀÇÇÏ¿© º­ Peroxidase Ȱ¼ºÀº °¢°¢ 57%¿Í 65%¾¿ °¨¼ÒÇÏ¿´´Ù. ±×·¯³ª ¶óµðÄ® ¼Ò°ÅÁ¦ÀÎ ethanol¿¡ ÀÇÇÏ¿© Cu¿Í Fe¿¡ ÀÇÇÑ È°¼º¾ïÁ¦´Â °ÅÀÇ ¿ÏÀüÇÏ°Ô º¸È£µÇ¾ú´Ù. ÀÌ¿¡ ºñÇØ dimethyl sulfoxide, mannitol, thiourea¿Í histidineÀº Cu¿Í Fe¿¡ ÀÇÇÑ È°¼º¾ïÁ¦¿¡ ´ëÇÏ¿© ¼­·Î ´Ù¸¥ ¶óµðÄ® ¼Ò°ÅÈ¿°ú¸¦ ³ªÅ¸³Â´Ù.
In order to examine the effect of SO$_2$, which is the major component of acid rain, on the peroxidase activity, rice (Oryza sativa) seedlings were grown on the media containing various concentrations of Na$_2$SO$_3$. Na$_2$SO$_3$ concentrations needed for the 50% inhibition of rice seed germination were determined to be 300$mu extrm{g}$/ml at pH 7, 8$mu extrm{g}$/ml at pH 5 and 2$mu extrm{g}$/ml at pH 3. Notably, about 8 fold and 4 fold increase of the specific activity of the enzyme were observed with the seedlings treated with 8$mu extrm{g}$/ml Na$_2$SO$_3$ at pH 5 and 2$mu extrm{g}$/ml Na$_2$SO$_3$ at pH 3, respectively. The effects of Cd and Pb on the peroxidase activities and chlorophyll contents were also examined. About 3.9 fold higher peroxidase activities were found at 0.03mM Cd, and the chlorophyll contents were reduced to 63% of the control seedlings. At 0.04mM Pb, 2.5 fold higher enzyme activities were found and the chlorophyll contents were reduced to 72%. Therefore, the increases of rice peroxidase activities might be involved in the defense mechanism of the cell against various environmental stresses such as Na$_2$SO$_3$, Cd and Pb. The effects of Cu and Fe, which are the inducers of oxidative stresses by the generations of reactive oxygen species, on the peroxidase activities were also investigated. About 57% and 65% activity losses were found at 0.5mM CuSO$_4$ and 0.5mM FeSO$_4$, respectively, and radical scavenger ethanol almost completely protected both inactivations. However, dimethyl sulfoxide, mannitol, thiourea and histidine showed different radical scavenging effects one another against Cu and Fe inactivation.
 
Ű¿öµå
Environmental stresses;Rice seedling;Peroxidase activity;
 
ȯ°æ»ý¹° / v.18, no.3, 2000³â, pp.331-336
Çѱ¹È¯°æ»ý¹°ÇÐȸ
ISSN : 1226-9999
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200011921491920)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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