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Temporal effects of soil moisture tension and salinity on isotopic fractionation during carbon assimilation in lettuce and young radish : 염 스트레스 하 상추와 열무에서의 탄소동위원소분할효과에 대한 토양수분장력과 이온조성의 시기별 영향

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Authors

최영대

Advisor
노희명
Issue Date
2005
Publisher
서울대학교 대학원
Keywords
염해salt stressNaK토양수분장력soil moisture tension광합성photosynthesis탄소동위원소분할효과carbon isotope fractionationδ13C상추lettuce열무young radish
Description
Thesis(master`s)--서울대학교 대학원 :농생명공학부,2005.
Abstract
To investigate the changes in ¥ä13C with the ratio of Na/K and soil moisture
tension under salt stress condition, lettuce(Lactuca sativa L. cv. chenogchima)
and young radish(Raphanus sativus L. cv. jinheung F1) whose response to salt
stress is different, were cultivated for 40days under greenhouse condition. Soil
EC (1:5) was adjusted by adding salt mixture of KCl, NaCl, CaCl2 and MgCl2?6H2O
whose ratio was 1:1:9:9 and 1:30:1:1 to be 0.2, 0.5, 1.0 1.5dS m-1. During
growth, soil moisture tensions were adjusted daily to -50¡¾5 kPa in treatments
of low Na/K ratio, while was adjusted daily to -35¡¾5 kPa and -50¡¾5 kPa in
treatments of high Na/K ratio, separately. Stomatal resistance was measured just
before final sampling. At 20DAT/S, dry mass of two crops decreased as soil EC
increased but effect of Na/K and soil moisture tension was not clear. At 40DAT/S,
dry mass of two crops decreased as soil EC increased. Dry mass under low Na/K
condition was higher than under high Na/K condition in both of crops. Soil
moisture tension affected positively dry mass in only young radish. At 20DAT/S,
¥ä13C of two crops decreased as soil EC increased but effect of Na/K and soil
moisture tension was not clear. In lettuce at 40DAT/S, ¥ä13C increased as soil
EC increased and that under low Na/K condition was lower than under high Na/K
condition but soil moisture tension did not affect ¥ä13C. In young radish at
40DAT/S, ¥ä13C increased as soil EC increased but that under low Na/K condition
was higher than under high Na/K condition and soil moisture tension affected
positively ¥ä13C, conversely with lettuce. Stomatal resistance under low Na/K
condition was lower than under high Na/K condition and under ?35kPa condition
was lower than under ?50kPa condition in both crops. At the same soil EC, ¥ä13C
of lettuce increased as content of Na increased by increasing stomatal
resistance, while ¥ä13C of young radish decreased as content of Na increased by
decreasing caboxylation. And in young radish at 40DAS, linearity between dry
mass and ¥ä13C decreased by the former phenomenon(0.8¡æ0.5). Since there was
dilution effect of soil water in only young radish, it was proposed that lettuce
was affected composition of salt in soil solution but young radish was affected
Na concentration in soil solution. Based on the result, this study suggested
that salt stress mainly decreased carbon isotope fractionation due to increased
stomatal resistance by osmotic effect but specific ion effect by increased ratio
of Na at the same soil EC affected differently carbon isotope fractionation
according to mechanism of inhibition to photosynthesis of plant, and in plant
that non-stomatal components played a main role in limiting photosynthesis,
since decrease of ¥ä13C by decreasing capacity for CO2 fixation by specific ion
effect, relationship between dry mass and carbon isotope fractionation would not
be useful in selecting high tolerant cultivars.
Language
English
URI
http://dcollection.snu.ac.kr:80/jsp/common/DcLoOrgPer.jsp?sItemId=000000051512

https://hdl.handle.net/10371/67569
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