| Broomcorn millet(Panicum. miliaceum L.) is the main crops food and economic crops at drought-stricken areas in north China, have a drought resistant barren, reproductive characteristics of the short duration of the crop structure adjustment and high-quality, high-efficiency agriculture plays an important role in development. As people's diets restructuring and strengthening of health awareness, as a fresh medical use of the important food resources, the status of broomcorn millet in the modern functional food development is rising rapidly. However, due to a latest start broomcorn millet research, basic research is relatively less, especially on the yield and quality of a decisive role in forming the metabolism of plants after jointing physiological characteristics lack of a systematic study and the lack of suitable field production plant varieties, and the extensive cultivation and management, yield levels are generally low. Therefore, the strengthening of broomcorn millet breeding, and exploring the growth and development of plants broomcorn millet, increasing grain yield and quality are the problems of broomcorn millet to be solved.In this study, in the broomcorn millet of breeding materials used in field and laboratory analysis of the combined system is more broomcorn millet yield on the crucial period - grain filling period related to the metabolism of plant physiological parameters - chlorophyll, soluble protein, soluble sugar , malondialdehyde (MDA) and superoxide dismutase (SOD), catalase (CAT), (POD) activity and root vigor, and other indicators of drought and broomcorn millet seedling, root and flag leaf senescence of physiological and biochemical mechanisms of a preliminary exploration, the following major conclusions are as follows:1. Broomcorn millet seedlings PEG stress test results show that the tested varieties of drought-resistant seedlings broomcorn millet capacity are as follows: Yu-Mi 3> Yu-Mi 1> Yu-Mi 2> Jicheng proso 1. In PEG stress conditions, Yu-Mi 3rd seedlings chlorophyll and soluble protein content was higher than that of Yu Mi 1, Yu Mi 2, Jicheng proso 1; leaves protective enzymes (SOD, CAT and POD) activity than-yu Mi 1, Yu Mi 2, Jicheng proso 1, membrane lipid peroxidation low level; slow accumulation of MDA content and low content of the slow pace of leaf senescence, and reduce the intensity of the slow metabolism, thereby demonstrating a strong drought tolerance.2. After jointing stage, the different leaf chlorophyll content, soluble protein content showed a downward trend in the same period of performance for the birth flag leaf> second leaf> third leaf > fourth leaf> fifth leaves. Jointing about 34 d, broomcorn millet different leaf blades of SOD, CAT and POD protection activity of a declining trend, the average flag leaf attenuation rate and 36.36, respectively 7.14,6.67 U ? g-1 ? d-1; second leaf of the average decay rate and 36.31 respectively 8.6,4.9 U ? g-1 ? d-1; third leaf average attenuation rate and 41.37, respectively 8.29,5.6 U ? g-1 ? d-1; fourth leaf of the attenuation rate for the average 8.5,5.64 and 45.49 U ? g-1 ? d-1; fifth leaves of the average rate of decay were 10.52,25.33 and 41.66 U ? g-1 ? d-1; flag leaf to maintain relatively high SOD, CAT and POD, effectively delayed the process of leaf senescence.3. At jointing about 34 d, broomcorn millet flag leaf and root (SOD, CAT and POD) activity and soluble protein content on a downward trend, the average activity of root decay rate and 36.36, respectively 2.82,4.54 U ? g-1 ? d-1 ; flag leaf activity of the average rate of decay and 34.21, respectively 7.14,6.67 U ? g-1 ? d-1; membrane lipid peroxidation product malondialdehyde (MDA) showed upward trend, root activity dropped 0.59 mgTTC? g-1? h-1 FW aging root level was significantly higher than leaves. Root and leaf senescence closely related to MDA from the changes, as early as the leaf senescence root, root and exacerbated the trigger senescence leaf senescence. Therefore, improving the rhizosphere nutrition, improving reproductive early root activity is helpful to delay the ground leaf senescence.4. From jointing stage to mature and broomcorn millet shoot dry matter accumulation was nearly"S"trend in the growth of dry matter accumulation process that jointing 34-48 d is the broomcorn millet of grain yield and the"library"of the crucial period. Broomcorn millet roots, leaves, stems, sheath dry matter accumulation curve showed a single peak, the seeds are provided to the assimilation of the"source", which leaves the main stem of flowering grain-filling is the main source of organs. Different period's broomcorn millet plant dry matter accumulation and transfer are significantly different. High-yielding varieties of grain filling stage organ in the dry matter accumulation and transfer ability, and especially the roots and leaves of dry matter accumulation, a larger"source"to the latter part of high grain operation. With greater capacity, we can get a higher grain yield and harvest index. |
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