摘要
采用水培培养的方式,比较Ca3(PO4)2模拟低磷胁迫下3种氮处理(NO3--N、NH4+-N和NO3--N与NH4+-N等体积混合)对玉米生物学特性及磷素吸收的影响。结果表明:当营养液中以Ca3(PO4)2形式供应磷素时,与对照(以KH2PO4形式供应磷素)相比,3种供氮处理玉米的整株生物量分别降低20.6%、12.9%和15.4%;同化物在根、茎和叶的分配也发生明显变化,表现为根冠比、根体积和茎叶比升高,其中硝态氮处理的根冠比升幅最大;对叶片生长的抑制作用最为明显,表现为叶片生物量和总叶面积显著降低,其中铵态氮处理的玉米植株叶面积和光合速率下降幅度最低;硝态氮处理的植株磷吸收量下降幅度最大。结论:玉米抗低磷胁迫的适应途径因供氮形态不同而异,铵态氮处理的植株比硝态氮更耐低磷胁迫。
A hydroponics experiment was carried out to study the effects of nitrogen forms（NO-3-N,NH＋4-N,and the mixture of NO-3-N and NH＋4-N）on maize seedling under the phosphorus stress treatment,which was about biological characteristic and phosphorus absorption simulated by using Ca3（PO4）2 as phosphorus form supply.The results showed that,when compared with the KH2PO4 treatment,the biomass of maize plant under phosphorus stress supplied with NO-3-N,NH＋4-N,and the mixture of NO-3-N and NH＋4-N was reduced by 20.6%,12.9% and 15.4%,respectively.However,all treatments increased the roots-shoot ratio,roots volume,and steam-leaf ratio of maize,among which the roots-shoot ratio of NO-3-N supplied plants showed the highest increase rate.Meanwhile,leaf growth was significantly reduced by phosphorus stress,which resulted in reduction of leaf biomass and leaf area,in which the leaf area and photosynthetic rate of NH＋4-N supplied plants showed the lowest reduction rate.Furthermore,the phosphorus absorption of NO-3-N supplied plants were higher than that of the other two nitrogen forms supplied plants.Therefore,we conclude that nitrogen forms supply is a major factor,which affects the adaptive response of maize to phosphorus stress,and the NH＋4-N treatment is found more tolerant to phosphorus stress as compared to the other two nitrogen forms supplied plants.
出处
《南京农业大学学报》
CAS
CSCD
北大核心
2012年第4期32-36,共5页
Journal of Nanjing Agricultural University
基金
国家公益性行业(农业)科研专项(201103004)
安徽省优秀青年科技基金项目(10040606Y02)
安徽自然科学基金项目(090411002)
关键词
低磷胁迫
玉米
氮素形态
生物学性状
磷吸收
phosphorus stress
maize
nitrogen forms
biological characteristics
phosphorus absorption
