论文部分内容阅读
在人工气候室条件下,采用溶液培养法研究了缺锌胁迫下平邑甜茶(Malus hupehensis Rehd.)和小金海棠(Malus xiaojinensis Cheng et Jiang)两种苹果砧木幼苗生长量、根系构型参数、根系活力和锌积累量的动态变化。结果表明:缺锌条件下,两品种均表现不同程度的植株矮小,新生叶片黄化且簇生,节间缩短,根尖膨大等缺锌症状,小金海棠表现缺锌症状比平邑甜茶延迟7d左右。长期锌缺乏使平邑甜茶根系生物量显著降低。两品种缺锌植株根系长度、表面积、体积、根尖数从21d开始均低于对照;60d时平邑甜茶较对照分别下降45.47%、44.2%、47.18%、43.14%,小金海棠分别降低38.95%、31.90%、32.58%、35.52%,平邑甜茶被抑制程度大于小金海棠。根系平均直径处理大于对照,且小金海棠表现根系膨大症状较平邑甜茶晚10d。锌缺乏条件下小金海棠根系活力达最大比平邑甜茶晚15d。处理和对照幼苗锌含量均表现为根系>茎>叶片,且小金海棠处理植株>平邑甜茶处理植株。平邑甜茶对缺锌胁迫较敏感,根系易受到伤害;小金海棠在缺锌胁迫下锌含量下降速率慢,对缺锌胁迫有较强的抵御和耐受能力。
Under the condition of artificial climate chamber, the growth of two apple rootstocks, Malus hupehensis Rehd. And Malus xiaojinensis Cheng et Jiang under zinc deficiency stress, the root system configuration parameters, root activity And zinc accumulation of dynamic changes. The results showed that under the conditions of zinc deficiency, the two cultivars all showed different degrees of plant dwarfity, new leaves were yellow and clustered, the internodes shortened, root tips enlarged and other zinc deficiency symptoms. The symptoms of zinc deficiency were delayed about 7 days . Long-term zinc deficiency significantly reduced the root biomass of P. euphratica. The root length, surface area, volume and number of root tips of two Zn-deficient plants decreased from 21d to 60d, respectively. Compared with the control, the content of root length, surface area, volume and number of root tips decreased by 45.47%, 44.2%, 47.18% and 43.14% , 31.90%, 32.58%, 35.52%, respectively. The inhibitory effect of Pingyi sweet tea was greater than that of Xiaogan Begonia. The average root diameter treatment is greater than the control, and the small golden crabapple root swelling symptoms than the Pingyi sweet tea 10d. Under the condition of zinc deficiency, the vigor of root activity of Malus xiaoi reached 15 days later than that of Malus domestica. The contents of Zn in seedlings of the treated and control seedlings were root> stem> leaf, and the treatment of Begonia officinalis> Phragmites australis treatment plants. Malvaceae is more sensitive to zinc deficiency stress and the root system is more susceptible to damage. Under the zinc deficiency stress, the decrease rate of zinc content of Malus sieboldii is slow, and it has strong resistance and tolerance to zinc deficiency stress.