摘要
研究硼素水平对甜菜叶片硼素状况和叶片结构及性能的影响,阐明硼素对甜菜叶片性能的影响机制,为甜菜生产实践硼肥施用提供理论依据。以甜菜单粒种‘HI0099’为试验材料,在水培条件下,设置十分缺乏(T1,0.05 mg/L)、缺乏(T2,0.5 mg/L)、正常(T3,2.0 mg/L)及过量毒害(T4,30.0 mg/L)4个硼营养浓度,对甜菜叶片硼含量及其光合性能进行测定,分析甜菜叶片硼含量及光合性能变化规律。结果表明:甜菜叶片的硼含量随着施硼量的增加而增加;在硼胁迫下,叶绿素含量、净光合速率和蒸腾速率均有下降的趋势。胞间CO2浓度在硼素缺乏时呈先降低后升高的趋势,在毒害时则呈现升高趋势。硼素胁迫均增加了栅栏组织、海绵组织及叶片厚度,硼毒害处理降低了上表皮和下表皮厚度。综合分析表明,硼素胁迫改变了叶片硼素水平和叶片结构,在一定程度上降低了叶片的光合性能。因此,在甜菜生产中合理施用硼肥来改善叶片结构及光合性能具有重要实践意义。
In order to clarify the mechanism of boron stress on leaf property and provide reference for boronfertilization in practice,the authors investigated the effects of different boron treatments on boron level,leafstructure and properties of sugar beet.Sugar beet seed‘HI0099＇was selected as the experimental material,four boron nutrition concentrations were set：very deficiency（T1,0.05 mg/L）,deficiency（T2,0.5 mg/L）,normal（T3,2.0 mg/L） and excessive toxicity（T4,30.0 mg/L）,the boron content in leaf and photosynthetic performancewere measured and the change rules were analyzed.The results showed that boron content of sugar beet leavesincreased with the increase of boron application amount.Under boron stress condition,chlorophyll content,netphotosynthetic rate and leaf transpiration rate all decreased.Intercellular CO2 concentration first decreased andthen increased under boron deficiency condition,it showed a rising trend under boron toxicity condition.Boronstress increased the thickness of palisade parenchyma,spongy parenchyma and leaf.However,thickness of theupper and lower epidermis decreased in toxicity condition.Comprehensive analysis showed that boron stresschanged leaf boron level and structure,decreased leaf photosynthetic property.Thus,the optimal boronapplication to improving leaf structure and properties had practical significance.
出处
《中国农学通报》
2016年第15期64-67,共4页
Chinese Agricultural Science Bulletin
基金
现代农业产业技术体系建设专项基金"东北区甜菜栽培"(CARS210301-03)
关键词
甜菜
硼营养
叶片
光合性能
sugar beet
boron nutrition
leaf
photosynthetic property
