Dissertation > Agricultural Sciences > Crop > Cereal crops > Wheat > Wheat > Winter wheat

Studies on Regulating Mechanism of Root Cutting and Its Interactive Effects with Fertilizer Application in Winter Wheat

Author LiXuHua
Tutor YuSongLie;YuZhenWen
School Shandong Agricultural University
Course Crop Cultivation and Farming System
Keywords Quit Nitrogen fertilizer Organic fertilizer Endogenous hormones Root activity Regulation
CLC S512.11
Type PhD thesis
Year 2002
Downloads 219
Quotes 1
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In this study, in 2000-2001 in Shandong Agricultural University, teaching farm and Resources and Environment College of net enclosures. Selection of farmers 15 and Lumai 22 as the tested wheat varieties, using a combination of field and soil column, quit on wheat growth regulation mechanism, wheat root growth and distribution of above-ground relations, especially root vigor, roots endogenous hormone content and the relationship between, and these endogenous hormones on wheat growth and development, and to explore the root pruning and nitrogen fertilizer and organic fertilizer on wheat physiological and biochemical indicators and yield, quality traits. To quit using quit deep Yun, cut 10cm rooting; wheat growth status according to the test, especially wheat tillers in reviving period quit. The main findings are as follows: 1. Wheat root and ground the Ministry of the relationship between wheat roots total fresh weight and surface 0-20cm root fresh weight and ground Ministry total dry weight, dry weight of grain, nutrient uptake, number of tillers or into panicles, etc. were significantly or very significantly the positive correlation . Of Wheat root vitality of different soil nutrient uptake, grain filling rate, grain weight, flag leaf photosynthetic rate and flag leaf chlorophyll content were significant or highly significant positive correlation; and root activity significantly affect wheat panicle number or panicle rate. Wheat growth and development of the post-root and flag leaf superoxide dismutase (SOD), peroxidase (POD) and peroxide and catalase (CAT) activity, malondialdehyde (MDA) content, nitrogen metabolisms are mutually Contact, closely related; improve and maintain the Grain of Wheat Root Vitality formed to build a good physiological basis. And from the study also found that the same parts of the wheat roots, leaves and seeds of different endogenous hormones and there is a significant correlation between the different parts of the same endogenous hormones. 2. Root pruning and fertilization interaction on wheat growth and nutrient absorption, distribution root pruning and fertilization, especially with organic fertilizer interaction can significantly promote root growth, improve soil deep roots ITC restore strength (energy), promote root absorption and NPK NPK assigned to the grain. Root pruning and fertilization interaction, wheat flag leaf photosynthetic rate and root and flag leaf SOD, POD, CAT activity, reduced MDA content, thereby enhancing the ability of wheat plants against membrane lipid peroxidation, delaying plant the aging process, to ensure that the grain filling period sufficient supply of photosynthetic products. 3. Root pruning and fertilization interaction on wheat yield and quality of wheat root pruning can reduce ineffective tillers increase into the ear to increase wheat acres of ears, grains per spike and grain weight, thus creating a reasonable population structure; also improve the economic coefficient. Nitrogen fertilizer and organic fertilizer application can also be different -2 - Li Xu spend: winter wheat root pruning regulation mechanism and root pruning and fertilization interaction effects of the increase into panicles, grain number and grain weight; fertilization and root pruning there was a significant positive interaction. Nitrogen application have changed the grain filling process, but the final grain weight increased relatively small;, increasing effect of nitrogen fertilizer significantly reduced with increasing amount of nitrogen. Quit by increasing the filling rate, increase grain weight. Root and organic fertilizers and nitrogen interaction improves activity of flag leaf sucrose phosphate synthase (SP), soluble sugar and sucrose content, so that the the starch deposition process grain total soluble sugar, sucrose content increased, thereby increasing the starch grains total content and early grain filling starch accumulation rate. Root pruning and fertilization interaction can also improve wheat roots and leaves nitrate reductase's mR plant glutamine synthetase (GS) activity and soluble protein content of the grain during the development of grain protein content and grain protein accumulation increased and two measures of cultivation there is a significant positive interaction. 4. Endogenous hormones start up period of wheat growth and development of self-regulation of wheat root and the changes in the function of endogenous hormones content synchronization wheat from the turn of the roots and leaves of the jointing stage of endogenous hormones content in particular their ratio of wheat sub-pod is closely related to the occurrence of growth and decay. Quit processing wheat root IAA, ABA content increased (Z + ZR) content decreases, the IAA / (Z + ZR) ratio increased, the ratio of IAA / ABA and (Z + ZR) / ABA reduced, thereby inhibiting the occurrence of side dishes; At the same time leaves IAA / (Z + ZR) ratio relative improvement, resulting in significant apical dominance, to promote wheat mulberry polarization and Sang robust growth. In the development process of the grain, grain (Z + ZR) peak and endosperm cells quickly split of coincidence, the peak of IAA and wheat maximum filling rate of coincidence GA3 peak before the IAA, with the rapid growth of grain filling rate of agreement, and the ABA's peak appeared in a significant reduction in the rate of grain filling. Grain dry weight, maximum grain filling rate and grains during grain filling, root and flag leaf in GA. (Z + ZR) and IAA average content and the highest levels were significantly or very significantly positive correlation with the average content of the grain filling stage ABA and the highest content were significant or highly significant negative correlation. Root pruning and fertilization can significantly improve the grain filling stage roots, leaves and grain GA3 (Z + ZR) and IAA average content of lower ABA levels, thereby contributing to the development of the wheat grain, increase grain weight. After the wheat flowering period, chlorophyll content and root and flag leaf in (Z + ZR) and the content of IAA was extremely significant with or a significant positive correlation, and showed a highly significant negative correlation with the content of ABA; through a step-by-step regression and path analysis of results show that (Z + ZR), mA and the ABA directly regulated by the flag leaf senescence, GA3 through the indirect effects of the impact of M (Z + ZR) and ABA content from the flag leaf senescence. Root pruning treatments increased wheat flag leaf and root IAA (Z + ZR) and GA. The content and decreased the content of ABA, thus delaying the aging of the plant. These results suggest that endogenous hormones regulating wheat root growth, tillering occurred, grain formation and the aging of the plant, and this effect is the endogenous hormones result of the role; endogenous hormone content in particular hormone the balance between regulation and control of the process of the growth of wheat. 5. The genotype differences Lumai wheat root pruning and fertilization treatments 22 points lower Sang into spikes and spike rate, grain number and grain weight higher grain protein content, yield potential of high-yielding varieties; smoke Lunar points pod into spikes and spike rate.

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