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弱光胁迫及光照转换后烟株生理生化的动态适应性变化反映了烟草的光生态适应性,对烟草种植区划、品质提升具有实际指导意义。大田试验条件下,用遮荫网在烟草不同生育阶段(伸根期和旺长期)营造不同的光照强度(自然光,透光率58.3%,透光率25.6%),研究了弱光环境对烟株生理特性和烤后烟叶化学成分的影响。结果表明:(1)弱光条件下叶片叶绿素、脯氨酸含量增加,丙二醛对遮荫处理的响应存在生育阶段差异。伸根期遮荫处理,叶绿素和脯氨酸平均增加了57.1%,51.4%;旺长期为23.2%,52.8%。(2)遮荫增加了烤后烟叶总氮、烟碱和钾含量,而总糖和还原糖略有下降,伸根期遮荫分别增加1.83%,1.57%,-0.77%,-2.00%,-2.6%;旺长期遮荫分别增加28.9%,29.2%,21.1%,-5.73%,-7.6%。可见,弱光胁迫对烟草生长和品质形成有重要影响,生育中期弱光胁迫比前期影响更大。
The changes of physiological and biochemical changes of tobacco plants under low light stress and light conversion reflect the eco-adaptability of tobacco plants, which has practical guiding significance for tobacco planting division and quality improvement. Under field conditions, different light intensities (natural light, light transmittance 58.3% and light transmittance 25.6%) were created by shading net at different growth stages of tobacco (rooting and wang long period) The Physiological Characteristics of Strain and the Chemical Components of Tobacco Leaves after Roasting. The results showed that: (1) chlorophyll and proline contents increased in low light conditions, and malondialdehyde had different growth stages in response to shading treatment. During rooting, chlorophyll and proline increased by 57.1% and 51.4% on average, while those in long-term were 23.2% and 52.8% respectively. (2) Shading increased the content of total nitrogen, nicotine and potassium in roasted tobacco, while the total sugar and reducing sugar decreased slightly. The shade at the rooting stage increased by 1.83%, 1.57%, -0.77%, -2.00% -2.6%; Mongolian long-term shade increased by 28.9%, 29.2%, 21.1%, - 5.73%, - 7.6%. It can be seen that low light stress has an important impact on tobacco growth and quality formation, and weak light stress during mid-growth period has a greater impact than the previous period.