| 赵 静1，郭勇祥2，林志豪2，陈晓鑫2，黄三文3，廖 红2.黄瓜磷效率评价及其基因型差异[J].广东农业科学,2015,42(19):27-35 |
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黄瓜磷效率评价及其基因型差异 |
| Evaluation of phosphorus efficiency andits genotypic variations in cucumber |
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| DOI： |
| 中文关键词: 黄瓜 磷效率 磷吸收效率 基因型差异 |
| 英文关键词: cucumber P efficiency P uptake
efficiency genotypic variation |
| 基金项目: |
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| 中文摘要: |
| 在水培条件下，评价了来源不同的18 个黄瓜基因型的磷效率，并初步分析了导致黄瓜磷效率
基因型差异的生理机理。结果表明，两周的低磷胁迫严重抑制了黄瓜地上部生长，但刺激了根系的生长，主
要表现在叶片数、叶面积、株高和茎粗降低，根冠比、比根长、总根长和总根表面积增加，根变细、根平均直
径降低等。与高磷处理下供试黄瓜相比，低磷处理导致植株的总磷吸收量都不及高磷处理下的一半，下降了
62.66%~93.96%，但磷利用效率提高了2~7 倍。大部分根系形态指标（包括主根长、总根长、根表面积等）与
黄瓜磷吸收效率显著相关。黄瓜的磷效率与其磷吸收效率极显著正相关，而与其利用效率相关性不大。磷胁迫
改变了黄瓜地上部和地下部形态构型、显著降低了黄瓜植株总磷效率和磷吸收效率，磷利用效率则显著提高，
基因型间差异显著。黄瓜的总磷效率主要由磷吸收效率决定。供试黄瓜中，基因型3、10、13 和17 为磷低效低
敏感型，而基因型1、14、15 和18 为磷高效高敏感型，可用于培育磷高效黄瓜品种。 |
| 英文摘要: |
| 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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