Effects of different levels of phosphorus availability on growth and phosphorus absorption of "Chinese Long" sequenced cucumber genotype
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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1 μmol·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. 10~100 μmol·L-1之间的磷浓度（如50 μmol·L-1）可作为黄瓜磷效率种质资源筛选的低磷处理浓度.
Abstract:ObjectiveTo 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.
MethodHydroponic culture was used to test effects of different P availability on the growth and P absorption of "Chinese Long".
Result and conclusionThe 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 example 50 μmol·L-1, can be used to screen the cucumber germplasms for P efficiency.
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Keywords:
- cucumber /
- phosphorus absorption /
- phosphorus efficiency /
- low P concentration
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图 1 不同磷浓度供应下黄瓜的生长
A：黄瓜整株，B：最新叶和最老叶，C：果实；各图从左至右磷处理浓度依次为1 000、100、10和1 μmol·L-1.
Figure 1. The growth of cucumber at different levels of P availability
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图 2 不同磷浓度供应下黄瓜的株高
柱子上凡是有一个相同小写字母者，表示差异不显著（P＞0.05，Duncan's法）.
Figure 2. Plant height of cucumber at different levels of P availability
表 2 不同磷浓度下黄瓜根形态参数1)
Table 2 Cucumber root morphological parameters at different levels of P availability
下载: 导出CSV
表 3 不同磷浓度下黄瓜植物磷效率1)
Table 3 Cucumber plant P efficiency at different levels of P availability
下载: 导出CSV
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