CAJ | 학술논문

在水培条件下,探讨了NaCl胁迫对青檀种子发芽率、叶气体交换和苗木生长的影响.研究结果表明,NaCl胁迫延长了青檀种子的发芽时间,特别是当NaCl浓度超过17 mM(1.0g/L)时,发芽率明显降低;NaCl胁迫降低了青檀叶的呼吸速率、气孔导度和净光合速率,并随着NaCl胁迫浓度的提高,下降的幅度更大,但NaCl胁迫苗木胞间隙CO2浓度明显高于对照;与对照相比,在NaCl胁迫50天后,青檀苗木的成活率、苗高和地径生长以及根系、茎和叶生物量显著降低,但茎和叶生物量下降更为明显.研究结果表明,青檀是一种对盐胁迫较敏感的植物,一年生幼苗的耐盐阈值在34 mM(2.0 g/L)左右.图2表3参27.
재수배조건하,탐토료NaCl협박대청단충자발아솔、협기체교환화묘목생장적영향.연구결과표명,NaCl협박연장료청단충자적발아시간,특별시당NaCl농도초과17 mM(1.0g/L)시,발아솔명현강저;NaCl협박강저료청단협적호흡속솔、기공도도화정광합속솔,병수착NaCl협박농도적제고,하강적폭도경대,단NaCl협박묘목포간극CO2농도명현고우대조;여대조상비,재NaCl협박50천후,청단묘목적성활솔、묘고화지경생장이급근계、경화협생물량현저강저,단경화협생물량하강경위명현.연구결과표명,청단시일충대염협박교민감적식물,일년생유묘적내염역치재34 mM(2.0 g/L)좌우.도2표3삼27.
Effects of NaCl on seed germination, leaf gas exchange and seedling growth were investigated. The germination of P. tatarinowii treatments induced reductions of transpiration rate, stomatal conductance and net photosynthetic rate and their reductions were significant with the increasing of NaCl concentration. However, intercellular CO2 concentration in seedling leaves under salt stress was significantly higher than that of controls. There was a significant reduction in survival, basal diameter increment and height increment witl increasing NaCl concentration 50 days after NaCl treatment, and a significant reduction in the dry weight increment of roots, stems, and leaves was also observed in the NaCl treatments. The deleterious effect on the biomass increment was more evident in the case of stems and leaves.Results from this study suggest that P. tatarinowii is sensitive to salinity stress and the salinity threshold for seedling growth might be less 34 mM (2.0 g· L-1).