CAJ | 학술논문

通过水培实验比较了山核桃Carya cathayensis幼苗在正常供磷(0.10mmol·L~(-1))和低磷胁迫(0.02mmol·L~(-1))务件下的根系形态、磷营养特点、叶片光合作用以及叶片和根系分泌酸性磷酸酶活性的差异.结果表明.低磷处理显著降低山核桃植株干质量、磷质量分数和磷积累量(P<0.05);与正常供磷相比,低磷处理条件下山核桃根长、根表面积和根体积显著降低(P<0.05);低磷处理显著降低山核桃叶片光合速率和气孔导度(P<0.05),但对叶片胞间二氧化碳摩尔分数元显著影响,这表明低磷胁迫对山核桃叶片光合速率的抑制作用主要是由于非气孔因素引起的.低磷胁迫使山核桃叶片酸性磷酸酶活性和根系分泌酸性磷酸酶活性显著增加(P<0.05),分别为正常供磷处理下的135%和159%.这表明磷缺乏诱导酸性磷酸酶活性的增加可能是山核桃适应低磷胁迫的机制之一.
통과수배실험비교료산핵도Carya cathayensis유묘재정상공린(0.10mmol·L~(-1))화저린협박(0.02mmol·L~(-1))무건하적근계형태、린영양특점、협편광합작용이급협편화근계분비산성린산매활성적차이.결과표명.저린처리현저강저산핵도식주간질량、린질량분수화린적루량(P<0.05);여정상공린상비,저린처리조건하산핵도근장、근표면적화근체적현저강저(P<0.05);저린처리현저강저산핵도협편광합속솔화기공도도(P<0.05),단대협편포간이양화탄마이분수원현저영향,저표명저린협박대산핵도협편광합속솔적억제작용주요시유우비기공인소인기적.저린협박사산핵도협편산성린산매활성화근계분비산성린산매활성현저증가(P<0.05),분별위정상공린처리하적135%화159%.저표명린결핍유도산성린산매활성적증가가능시산핵도괄응저린협박적궤제지일.
Phosphorus(P)deficiency is one of the limiting factors to plant growth.However,scarce information is available about the effect of P deficiency on the growth of Carya cathayensis.To study root morphology,leaf photosynthesis characteristics,leaf acid phosphatase,and root secreted acid phosphatase of Carya cathayensis seedlings,a hydroponic culture experiment with treatments of sufficient P(0.1mmol·L~(-1))or deficient P(0.02mmol·L~(-1))was conducted.Results showed that compared to sufficient P,the low P treatment significantly decreased(P<0.05)plant dry weight,plant P concentration,plant P accumulation,root length,root sufface area,root volume leaf photosynthetic rate,and stomatal conductance;however,there were no significant differences for intercellular CO_2 concentration.Additionally,the low P treatment significantly increased(P<0.05)leaf acid phosphatase(by 135％)and root secreted acid phosphatase(by159％).Thus,the low P treatments with decreases in leaf photosynthetic rate and stomatal conductance,but no differences for intercellular CO_2 concentration,showed that leaf photosynthetic rate was not due to stomatal limitation.Also,for C.cathayensis an increase in acid phosphatase activity induced by a P deficiency could be an adaptive mechanism to low P stress.