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| Evaluation of phosphorus efficiency andits genotypic variations in cucumber |
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| Abstract: |
| Through hydroponic culture，P efficiencies of 18 cucumber genotypes from different origins were
evaluated，and the physiological mechanisms of genotypic variations underlying the cucumber P efficiency were
primarily studied. Results showed that cucumber shoot growth was significantly inhibited，while root growth was
stimulated after two-week low P treatment，as mainly indicated by decreased leaf number，leaf surface area，shoot
height and stem diameter；increased ratio of root to shoot，specific root length，total root length and root surface area；
as well as finer roots with reduced root diameter. Compared with cucumber seedlings at high P treatment，P contents
of cucumbers under low P conditions decreased less than half of those at high P treatment，about 62.66% to 93.96%，
while P use efficiencies increased by 2 to 7 times. Most root parameters（including tap root length，total root length
and root surface area）were significantly related with cucumber P uptake efficiency. Cucumber P efficiency was
significantly related with P uptake efficiency，but not related with P use efficiency. Low P stress changed cucumber shoot
and root morphologies，significantly decreased total P efficiency and P uptake efficiency of cucumber，but increased
P use efficiency，there were significant genotypic variations. Cucumber total P efficiency was mainly determined by
P uptake efficiency. Among tested cucumbers，genotype 3，10，13 and 17 belonged to type I（low P efficiency and
low P responsiveness），while genotype 1，14，15 and
18 belonged to type III（high P efficiency and high P
responsiveness），which can be used for cultivating
P-efficient cucumber varieties. |
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