유채에서 황 공급수준에 따른 글루타치온 함량의 변화가 황산염 흡수 및 동화관련 효소활력에 미치는 영향 Glutathione Concentration as Affected by Sulfate Supply Level and its Relationship with Sulfate Uptake and Assimilatory Enzymes Activity in Rape Plants원문보기
유채 (Brassica napus L.)에서 황 공급수준에 따른 글루타치온 함량의 변화가 황 흡수 및 동화관련 효소 활력에 미치는 영향을 규명하고자, $SO_4^{2-}$ 농도를 4수준 (0, 0.1, 1.0 및 2.0 mM)으로 25시간 처리 한 후 식물조직 내 글루타치온 함량을 측정하고, $SO_4^{2-}$ 흡수, ATP sulfurylase (ATPS) 및 O-acteylserine (thiol) lyase (OASTL) 효소 활력과의 상관관계를 분석하였다. $SO_4^{2-}$ 흡수는 황 공급수준에 따라 평행적인 증가를 보였으나 잎과 뿌리 조직의 단백질 함량은 유의적인 차이가 없었다. ATPS 활력은 황 공급수준이 0 mM에서 2.0 mM로 증가함에 따라 유의적으로 감소 (p<0.05) 하였으며, OASTL 활력은 황 결핍수준인 0 및 0.1 mM에서만 유의적인 감소 (p<0.05)를 보였다. 어린잎, 중간잎 및 뿌리 조직에서는 황 결핍수준이 증가함에 따라 글루타치온 함량은 유의적으로 증가 (p<0.05) 하였으나, 뿌리에서는 처리간 유의적인 차이가 없었다. 황 공급수준의 감소에 따른 글루타치온 함량과 $SO_4^{2-}$ 흡수간에는 고도의 정의 상관관계 (p<0.01)가 인정되었으며, 잎과 뿌리내의 ATPS 및 잎조직의 OASTL 효소활력 간에는 각각 부의 상관관계 (p<0.05)가 인정되었다.
유채 (Brassica napus L.)에서 황 공급수준에 따른 글루타치온 함량의 변화가 황 흡수 및 동화관련 효소 활력에 미치는 영향을 규명하고자, $SO_4^{2-}$ 농도를 4수준 (0, 0.1, 1.0 및 2.0 mM)으로 25시간 처리 한 후 식물조직 내 글루타치온 함량을 측정하고, $SO_4^{2-}$ 흡수, ATP sulfurylase (ATPS) 및 O-acteylserine (thiol) lyase (OASTL) 효소 활력과의 상관관계를 분석하였다. $SO_4^{2-}$ 흡수는 황 공급수준에 따라 평행적인 증가를 보였으나 잎과 뿌리 조직의 단백질 함량은 유의적인 차이가 없었다. ATPS 활력은 황 공급수준이 0 mM에서 2.0 mM로 증가함에 따라 유의적으로 감소 (p<0.05) 하였으며, OASTL 활력은 황 결핍수준인 0 및 0.1 mM에서만 유의적인 감소 (p<0.05)를 보였다. 어린잎, 중간잎 및 뿌리 조직에서는 황 결핍수준이 증가함에 따라 글루타치온 함량은 유의적으로 증가 (p<0.05) 하였으나, 뿌리에서는 처리간 유의적인 차이가 없었다. 황 공급수준의 감소에 따른 글루타치온 함량과 $SO_4^{2-}$ 흡수간에는 고도의 정의 상관관계 (p<0.01)가 인정되었으며, 잎과 뿌리내의 ATPS 및 잎조직의 OASTL 효소활력 간에는 각각 부의 상관관계 (p<0.05)가 인정되었다.
The glutathione (GSH) concentration in leaves of different maturities and roots of forage rape (Brassica napus L.) supplied with four levels of external $SO_4^{2-}$ (0, 0.1, 1.0 and 2.0 mM) supply were measured. The relationships of GSH concentration with $SO_4^{2-}$ uptake, AT...
The glutathione (GSH) concentration in leaves of different maturities and roots of forage rape (Brassica napus L.) supplied with four levels of external $SO_4^{2-}$ (0, 0.1, 1.0 and 2.0 mM) supply were measured. The relationships of GSH concentration with $SO_4^{2-}$ uptake, ATP sulfurylase (ATPS) and O-acteylserine (thiol) lyase (OASTL) activity were also assessed. The $SO_4^{2-}$ uptake increased in parallel with the external $SO_4^{2-}$ supply, while protein concentration was not significantly changed. The ATPS activity increased continuously with decreasing $SO_4^{2-}$ supply from 2.0 to 0 mM, while the OASTL activity decreased significantly only at S-deficient conditions (0 and 0.1 mM). The GSH concentration in the young leaves, middle leaves and roots continuously increased (except for between 1.0 and 2.0 mM in the middle leaves and roots) as the external S supply was increased, but no significant changes occurred in the old leaves. The increased endogenous GSH concentration, affected by the $SO_4^{2-}$ supply level, was significantly related with the decrease in ATPS activity in both leaves and roots, and the decrease in OASTL activity only in leaves..
The glutathione (GSH) concentration in leaves of different maturities and roots of forage rape (Brassica napus L.) supplied with four levels of external $SO_4^{2-}$ (0, 0.1, 1.0 and 2.0 mM) supply were measured. The relationships of GSH concentration with $SO_4^{2-}$ uptake, ATP sulfurylase (ATPS) and O-acteylserine (thiol) lyase (OASTL) activity were also assessed. The $SO_4^{2-}$ uptake increased in parallel with the external $SO_4^{2-}$ supply, while protein concentration was not significantly changed. The ATPS activity increased continuously with decreasing $SO_4^{2-}$ supply from 2.0 to 0 mM, while the OASTL activity decreased significantly only at S-deficient conditions (0 and 0.1 mM). The GSH concentration in the young leaves, middle leaves and roots continuously increased (except for between 1.0 and 2.0 mM in the middle leaves and roots) as the external S supply was increased, but no significant changes occurred in the old leaves. The increased endogenous GSH concentration, affected by the $SO_4^{2-}$ supply level, was significantly related with the decrease in ATPS activity in both leaves and roots, and the decrease in OASTL activity only in leaves..
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가설 설정
In these contexts, we hypothesized in this study that the change in GSH concentration as a result of different levels of SO42- supply might be associated with the control of SO42- uptake and assimilation. In order to test this hypothesis, GSH concentration was analyzed in leaves of different maturities and roots of rape plants supplied with four levels of externalSO42- supply.
제안 방법
uptake and assimilation. In order to test this hypothesis, GSH concentration was analyzed in leaves of different maturities and roots of rape plants supplied with four levels of externalSO42- supply. The relationships of GSH concentration in leaves with SO42- uptake and the activity of key enzymes of SO42- assimilation were also assessed.
01). To examine further the physiological significance of GSH accumulation in shoot in regulating SO42- assimilation, the relationships of GSH concentration in leaves with the activity of ATPS (Fig. 2B) and OASTL (Fig. 2C) were also analyzed. As indicated at Fig.
데이터처리
Bars labeled with different letters in a plant organ are significantly different (p<0.05) according to Duncan’s multiple range test.
Duncan’s multiple range test was employed to compare the means of separate replicates.
성능/효과
It has been reported that in soybean plants, SO42- in the transpiration stream was predominantly delivered to developing leaves, despite the fact that matured and young leaves transpired at an equal rate (Smith and Lang, 1988). In this study, GSH concentrations, which an immediate S assimilates, in the young and the middle leaves were much higher than those in old leaves or roots, and the GSH concentration in the young leaves significantly decreased (Fig. 1) with a concomitant decrease in the activity of ATPS and OASTL (Table 1) as external SO42- supply was lowered. These suggested that the active site of SO42- assimilation might be young tissue rather than old or mature leaf tissues, and sulfate metabolism would be much more restricted by S-limited nutrition.
후속연구
uptake and assimilation are closely associated with the GSH concentration and the operating process enables plants to respond with general flexibility to fluctuation of S availability in root environment. If so, it would be an important component for the development of field diagnostic tests to determine whether plants are S-deficient.
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