Abstract
염 스트레스 하에서 벼 생육에 대한 저선량 방사선의 경감효과를 확인하기 위해 일품벼와 간척벼 두 품종에 저선량 감마선을 0-32 Gy 수준으로 조사하였다. 염 처리에 따른 생장반응은 무 처리구에 비해 두 품종 모두 염 처리구에서 생육이 감소하였으며, 초장과 생체중보다 건물중에서 더 많은 감소를 보였다. 이외에도 초기건량에 대한 단위시간당 건물의 증가를 나타내는 상대생장율을 관찰한 결과, 전체 상대생장율이 염 처리구에서 50% 이상 억제되었다. 그러나 이러한 생육억제는 저선량 방사선에 의해 경감됨을 확인할 수 있었다. 특히, 줄기 상대생장율의 경우 염 처리시 4 Gy 조사구가 대조구보다 30% 이상의 경감효과를 보였다. 또한 염 스트레스에 대한 조직의 막투과성 정도는 염 처리에 의해 4배 정도 피해를 보였으나 4 Gy 조사구에서 10% 이상의 경감효과를 보였으며, 상대수분함량도 30% 정도의 감소를 보인 염 처리구에서 저선량 방사선의 효과를 확인 할 수 있었다. 이러한 결과를 통해, 저선량 방사선이 염 스트레스에 대한 저해 효과를 경감시키는 것으로 사료된다. To investigate alleviation effects of salt stress by low dose gamma-irradiation on seedling growth of rice (Oryza shrive L), in plants of two rice cultivars (Ilpumbyeo and Gancheokbyeo), seeds were irradiated with the different doses $(0{\sim}32\;Gy)$ of gamma-ray by irradiator ($^{60}Co$, ca.150 TBq of capacity, AECL). The salt stress caused a remarkable decrease of seedling growth, particularly for dry weight. In addition, relative growth rate was decreased over 50% by the salt stress. However, the salt stress-induced inhibition of growth was alleviated by gamma-irradiation. Especially, the relative growth rate of shoot showed the reduction effect over 30% at 4 Gy-irradiated groups as compared with that of control. Also, electrolyte leakage and relative water content were damaged, respectively 4 times and 30% by the salt stress but the damages were alleviated by the gamma-irradiation. These alleviation effects were observed similarly in both the cultivars tested. These results suggest that the low dose gamma-irradiation may have a better protection or the salt stress.
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Claims 7
Claim · model-written summary
Salt stress reduced rice seedling growth, especially dry weight.
- Taxon
- rice (Oryza sativa L.)
Oryza sativat0 - Treatment
- salt stresse0
- Outcome
- seedling growth, particularly for dry weighte0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The salt stress caused a remarkable decrease of seedling growth, particularly for dry weight”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Salt stress decreased relative growth rate by over 50%.
- Taxon
- rice (Oryza sativa L.)Oryza sativat0
- Treatment
- salt stresse0
- Outcome
- relative growth ratee0
- Direction
- decreasede0
- Value
- over 50%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“relative growth rate was decreased over 50% by the salt stress”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Gamma irradiation alleviated salt-related growth inhibition.
- Taxon
- rice (Oryza sativa L.)Oryza sativat0
- Treatment
- gamma-irradiatione0
- Outcome
- salt stress-induced inhibition of growthe0
- Direction
- alleviatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the salt stress-induced inhibition of growth was alleviated by gamma-irradiation”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
At 4 Gy, gamma irradiation reduced the salt effect on shoot relative growth rate by over 30% against control.
- Taxon
- rice (Oryza sativa L.)Oryza sativat0
- Treatment
- 4 Gy-irradiated groupse0
- Outcome
- relative growth rate of shoote0
- Direction
- reduction effecte0
- Value
- over 30%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the relative growth rate of shoot showed the reduction effect over 30% at 4 Gy-irradiated groups as compared with that of control”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Salt stress damaged electrolyte leakage fourfold.
- Taxon
- rice (Oryza sativa L.)Oryza sativat0
- Treatment
- salt stresse0
- Outcome
- electrolyte leakagee0
- Direction
- damagede0
- Value
- 4 timese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“electrolyte leakage and relative water content were damaged, respectively 4 times and 30% by the salt stress”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Salt stress damaged relative water content by 30%.
- Taxon
- rice (Oryza sativa L.)Oryza sativat0
- Treatment
- salt stresse0
- Outcome
- relative water contente0
- Direction
- damagede0
- Value
- 30%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“electrolyte leakage and relative water content were damaged, respectively 4 times and 30% by the salt stress”
t0“rice (Oryza sativa L.)”
Claim · model-written summary
Gamma irradiation alleviated salt damage to electrolyte leakage and relative water content in both cultivars.
- Taxon
- rice (Oryza sativa L.)Oryza sativat0
- Treatment
- gamma-irradiatione0
- Outcome
- damagese0
- Direction
- alleviatede0
- Qualifier
- both the cultivars testede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the damages were alleviated by the gamma-irradiation. These alleviation effects were observed similarly in both the cultivars tested”
t0“rice (Oryza sativa L.)”
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