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한국자원식물학회 / v.24, no.4, 2011년, pp.413-418 
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P-V 곡선법에 의한 참취와 수리취의 수분포텐셜 비교
( Comparison of Water Potential Parameters in Aster scaber and Synurus deltoides Leaves Obtained from P-V Curves ) |
| 이경철;전성렬;한상섭; 강원대학교 산림환경과학대학 산림자원조성학;강원대학교 산림환경과학대학 산림자원조성학;강원대학교 산림환경과학대학 산림자원조성학;
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| 초 록 |
| P-V 곡선을 적용하여 참취와 수리취의 수분특성인자를 측정한 결과 최대포수시의 삼투포텐셜 ${Psi}^{sat}_o$과 초기원형질 분리점의 삼투포텐셜 ${Psi}^{tlp}_o$은 참취가 수리취보다 낮은 값을 나타냈으나 큰 차이를 보이지는 않았다. 최대팽압 ${Psi}_{P,max}$는 참취가 수리취에 비해 높게 나타났으며, 최대탄성계수 $E_{max}$는 참취가 수리취에 비해 약 2.4배 정도 높은 값을 나타냈다. 초기원형질분리점에서의 상대함수율 $RWC^{tlp}$은 참취와 수리취 모두 90% 이상의 함수율을 보여 비교적 삼투 조절기능이 좋은 것을 알 수 있었고, apoplastic water의 비율은 참취가 더 크며, Vo/DW, Vt/DW, Ns/DW은 수리취가 참취에 비해 약 1.5~2.0배 정도 큰 경향을 보였다. 위 결과를 통해 참취와 수리취 모두 초기원형질분리점과 최대포수시의 삼투포텐셜이 높은 편으로 내건성은 비교적 약한 것으로 나타났으며, 습윤한 지역이 생육에 적합함을 알 수 있었다. 또한, 참취와 수리취를 비교할 때 참취가 수리취에 비해 건성잎의 특성을 가지고 있으며, 최대탄성계수와 삼투포텐셜이 높아 내건성이 약간 더 강한 것을 알 수 있었다. |
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| This study was carried out to establish a proper cultivation site and diagnose the drought-tolerance of Aster scaber and Synurus deltoides leaves by using Pressure-volume curves. In order to measure pressure-volume (P-V) curves, Aster scaber and Synurus deltoides were cut off above ground part and the tip of the cutting were placed in water, which was covered with a plastic bag. Samples were kept overnight (about 12 hours) in darkness at room temperature (20~25$^{circ}C$) to achieve maximal turgor (full saturation). The pressure in the chamber was gradually increased from 0.3MPa to 1.8MPa by nitrogen gas. After measured, leaf samples were dried at 80$^{circ}C$ for 48 hours and dry weight of each samples were determined. The result of the original bulk osmotic potential at maximum turgor ${Psi}^{sat}_o$ sat was lower -0.8 MPa in Aster scaber leaves than -0.7 MPa Synurus deltoides leaves. Also the osmotic potential at incipient plasmolysis ${Psi}^{tlp}_o$ in Aster scaber leave was -0.9 MPa. In contrast, the value of maximum bulk modulus of elasticity $E_{max}$ of Aster scaber leaves were approximately two folds higher than that of Synurus deltoides leaves. The values of the relative water content at incipient plasmolysis $RWC^{tlp}$ are all above 90% showing that the function of osmoregulation is somewhat better, and Vo/DW, Vt/DW, Ns/DW of Synurus deltoides leaves were approximately 1~2 times higher than that of Aster scaber leaves. Thus, responses to water relations of Aster scaber and Synurus deltoides such as ${Psi}^{sat}_o$, ${Psi}^{tlp}_o$, $E_{max}$, ${Psi}_{P,max}$, $RWC^{tl}$ were shown that the Aster scaber leaves was slightly higher drought-tolerance than Synurus deltoides leaves. However, in both of Aster scaber and Synurus deltoides, occurring incipient plasmolysis at the high water content, have a relatively lower drought-tolerance property indicating that growth of these plants are cultivated appropriate in high moisture soil sites. |
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| 키워드 |
| Drought-tolerance;Maximum turgor;Osmoregulation;Proper cultivation; |
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한국자원식물학회지 / v.24, no.4, 2011년, pp.413-418
한국자원식물학회
ISSN : 1226-3591
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO201125136122588)
언어 : 한국어 |
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| 논문 제공 : KISTI 한국과학기술정보연구원 |
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