供磷水平对黄瓜测序品种“中国龙”生长及磷吸收的影响  

Effects of different levels of phosphorus availability on growth and phosphorus absorption of “Chinese Long”sequenced cucumber genotype

作　　者：林志豪[1] 冯健禹 郭勇祥 廖红[1] 赵静[1] 

机构地区：[1]亚热带农业生物资源保护与利用国家重点实验室/华南农业大学根系生物学研究中心,广东广州510642

出　　处：《华南农业大学学报》2015年第3期54-58,共5页Journal of South China Agricultural University

基　　金：广东省高等学校高层次人才项目(粤财教[2011]431号)

摘　　要：【目的】了解黄瓜测序品种“中国龙”对不同磷浓度供应的反应，寻找在水培条件下进行黄瓜磷效率种质筛选的适宜低磷处理浓度．【方法】采用营养液水培试验，研究了不同磷浓度供应对黄瓜测序品种“中国龙”生长及其磷吸收的影响．【结果和结论】随着供磷浓度的降低，“中国龙”的生长受到抑制，植株变矮，老叶黄化．在严重低磷（10和1μmol·L^-1）胁迫时，植株生长受到严重抑制，甚至不能正常结瓜．低磷降低了“中国龙”的生物量、磷吸收效率，但增加了根冠比，促进了碳水化合物向根部的分配．此外，在低磷胁迫下，“中国龙”还通过降低根平均直径，即根变细，来增加与养分的接触面积．10～100μmol·L^-1之间的磷浓度（如50μmol·L^-1）可作为黄瓜磷效率种质资源筛选的低磷处理浓度．【Objective】To explore the responses of 'Chinese long'sequenced cucumber genotype to different phosphorus( P) availability,and to screen an optimal low-P-treatment concentration for cucumber germplasms screening for P efficiency under a hydropoic condition. 【Method】Hydroponic culture was used to test effects of different P availability on the growth and P absorption of 'Chinese Long'. 【Result and conclusion】The results showed that with the decrease in P availability,cucumber plants became shorter and smaller,and new leaves became smaller and old leaves became yellow. Severe P deficiency( 10 and 1 μmol·L- 1) significantly inhibited the cucumber plant growth,even resulting in abnormal fruits. Low P availability decreased the biomass and P uptake efficiency of 'Chinese Long ',but increased its ratio of root to shoot,which preferably allocated carbonhydrate to root. Furthermore,under P deficiency,'Chinese Long'also formed finer roots with a small root diameter,thus increasing the contact area with nutrients in the growth medium. The P concentration of 10- 100 μmol·L- 1,for example50 μmol·L- 1,can be used to screen the cucumber germplasms for P efficiency.

关 键 词：黄瓜 磷吸收 磷效率 低磷浓度 

分 类 号：S642.2[农业科学—蔬菜学]