CAJ | 학술논문

以耐盐性较弱的黄瓜品种津优4号为材料,采用营养液栽培法,研究外源硅对盐胁迫下黄瓜幼苗生长、叶绿素含量、气体交换参数以及叶绿素荧光特性的影响。结果表明,70 mmo1/L NaC1处理显著降低了黄瓜幼苗叶片的净光合速率( Pn ),抑制黄瓜幼苗生长,而2 mmo1/L 外源硅处理缓解了盐胁迫诱导的光合和生长抑制；盐胁迫下,黄瓜幼苗叶片单位反应中心吸收的光能( ABS/RC)和单位反应中心的能态淬灭( DIo/RC)显著上升,降低了光系统II( PSII)非环式电子传递的能力,引起黄瓜幼苗叶片光合器官的结构性能( PIABS )和光合作用质子驱动力( DFABS )显著下降；外源硅处理逆转了盐胁迫导致的叶绿素荧光参数的变化。这些结果表明外源硅处理可缓解盐胁迫对黄瓜幼苗光合器官结构和功能的伤害,促进黄瓜幼苗的生长,从而有助于增强黄瓜植株对盐胁迫的耐受性。
이내염성교약적황과품충진우4호위재료,채용영양액재배법,연구외원규대염협박하황과유묘생장、협록소함량、기체교환삼수이급협록소형광특성적영향。결과표명,70 mmo1/L NaC1처리현저강저료황과유묘협편적정광합속솔( Pn ),억제황과유묘생장,이2 mmo1/L 외원규처리완해료염협박유도적광합화생장억제；염협박하,황과유묘협편단위반응중심흡수적광능( ABS/RC)화단위반응중심적능태쉬멸( DIo/RC)현저상승,강저료광계통II( PSII)비배식전자전체적능력,인기황과유묘협편광합기관적결구성능( PIABS )화광합작용질자구동력( DFABS )현저하강；외원규처리역전료염협박도치적협록소형광삼수적변화。저사결과표명외원규처리가완해염협박대황과유묘광합기관결구화공능적상해,촉진황과유묘적생장,종이유조우증강황과식주대염협박적내수성。
The present study was conducted to investigate the effects of exogenous si1icon on p1ant growth, ch1orophy11 content, gas exchange parameter and structure and function of photosynthetic apparatus in sa1t-sensitive cucumber cu1tivar (Jinyou No. 4) exposed to NaC1 stress. Sa1t stress at 70 mmo1/L NaC1 for 9 d resu1ted in severe reductions of growth, ch1orophy11 contents and photosynthesis. App1ication of exogenous si1icon ( 2 mmo1/L K2 SiO3 ) a11eviated the inhibition induced by sa1t stress. Sa1t stress caused an increase in functiona1 size of the anten-na per active reaction center ( ABS/RC) and non-photochemica1 energy dissipated per active reaction center ( DIo/RC) and a decrease, 1eading to the decreases the abi1ity of non-cyc1ic e1ectron transport in photosystem II ( PSII) in structure performance index ( PIABS) and riving force of photosynthesis ( DFABS) . However, si1icon app1ication to sa1t-stressed p1ants counteracted the adverse effects of sa1inity on the structure of photosynthetic apparatus. These resu1ts suggest that si1icon a11eviates sa1t-induced growth inhibition by regu1ating the photochemica1 efficiency of PSII of cucumber seed1ings, which contributes to the sa1t to1erance of cucumber p1ants.