Leaf Senescence And Reactive Oxygen Metabolism Of Different Water-saving Cultivation Mode In Millet

Millet is a major grain and forage crops in the Loess Plateau dryland farming areas,which the level of production severely restricts of agricultural development and farmers’income in the area. But growth of Millet is limited by water and fertilizer conditions in thearea, the yield level is generally low,so research on Millet drought physiologicalcharacteristics, research and promotion of efficient cultivation techniques is important todryland farming areas of agricultural production and farmers income.In this study, japonica millet varieties of Yu Mi2is used as material, conventional openfield cultivation as a control,under Shuang’gou coverage, ridging coverage, tectorialmembrane, straw mulch cultivation mode measured and functional leaves senescence andactive oxygen metabolism related indicators during the grain filling---chlorophyll, solubleprotein, superoxide dismutase (SOD), peroxidase (POD) activity, malondialdehyde (MDA)and oxygen radicals, to explore different water-saving cultivation models Millet functionalleaves senescence and active oxygen metabolism and yield formation mechanism during grainfilling mechanism, in order to provide a theoretical basis of improving the fertilizer useefficiency of arid regions, and achieving high yield of Millet. Study reached the followingconclusions:1. Millet grain filling period, the main stem of functional leaves-chlorophyll andsoluble protein content of top three leaves tends to become less, there are differences in thesame growth stages of different leaf blades, and its content in descending order: the flag leaf>2nd leaf>3rd leaf. Chlorophyll and soluble protein content of top three leaves betweendifferent modes of water-saving cultivation has significant differences, in the same growthperiod compared with conventional open field cultivation (CK) is higher, as follows:Shuang’gou coverage> ridging coverage> tectorial membrane> straw mulch.2. Millet grain filling period, the main stem function leaves-Top three leavessuperoxide dismutase (SOD) and peroxidase (POD) activity as a whole showed a decreasingtrend, there are differences between different leaf blades. its content in order was: flag leaf>2nd leaf>3rd leaf. Under conventional open field cultivation mode SOD and POD activity of top three leaves was significantly lower than mulching (P <0.05), the same growth stages ofits activity as follows: Shuang’gou coverage> ridging coverage> tectorial membrane> strawmulch> conventional cultivation.3. Millet grain filling period, superoxide anion radical and MDA content of main stemfunction leaves an overall upward trend, showing rising slowly in7-28days after flowering,28days later a sharp rise. There are differences between different leaf blades, and its contentin order was3rd leaf>2nd leaf> flag leaf. Superoxide anion and MDA content of Millet topthree leaves under conventional cultivation mode was significantly higher than mulching (P<0.05); in the same growth stage, its content as follows: conventional cultivation> strawmulch> tectorial membrane> ridging coverage> Shuang’gou coverage.4. Covers cultivation can significantly improve farmland soil moisture, especially in theseedling stage and jointing stage the effect of covers cultivation mode is significant, farmlandsoil moisture content are imparity in different coverage patterns, expressed as Shuang’goucoverage>ridging coverage>tectorial membrane>straw mulch> conventionalcultivation,Shuang’gou coverage saving cultivation mode can significantly increase soilmoisture in0~20cm soil layer,better than other covers cultivations. Among differentcultivation modes, grain yield and soil water use efficiency have significant differences,compared with the conventional cultivation,the soil water use efficiency of mulching,mulching, ridging coating and laminating respectively increased by4.44%,8.26%,18.56%,22.74%,the grain yield of straw mulch,tectorial membrane,ridging coverageand Shuang’gou coverage respectively increased by1.37%，8.44%，17.40%，23.65%.The results show that Millet mulching function can effectively improve the ability ofmillet leaves scavenging reactive oxygen species, thus delaying the aging process of the leaf,and can improve farmland soil moisture and water use efficiency, promote growth anddevelopment in order to obtain high yield; shuang’gou coverage is the best film cultivationmodel in Yulin region and it can be extended in similar areas.