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Genetic Variation of Growth and Water Use Efficiency in Schima Superba

Author: LinLei
Tutor: XieJinZhong
School: Chinese Academy of Forestry
Course: Ecology
Keywords: Schima superba Provenances Pedigree Grow Water use efficiency (WUE) Genetic variation
CLC: S792.99
Type: Master's thesis
Year: 2009
Downloads: 29
Quote: 1
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Abstract

Schima superba China's southern provinces, autonomous regions, the most important biological fire tree species and quality of fast-growing timber species. In this paper, set the the Schima plus trees pedigree on seedling growth of material in the three pilot Fujian Jian'ou, Longquan, Zhejiang Chunan, research and reveal their seedling growth and morphological traits pedigree genetic variation. The Schima superba region 5-year-old experimental forest, to study the growth and form quality traits provenances Genetic Variation and Genetic related reveal Provenance Variation of Schima stable carbon isotope discrimination law and the plantation and the environment and provenance growth its impact. Pot experiment, combined with different water and phosphorus processing research Schima superba seedlings to drought and low phosphorus stress reaction, the effects of the water and Phosphorus interaction conditions for seed-derived growth and phosphorus efficiency differences. Draw the following conclusions: (1) Schima height, ground diameter, number of leaves, leaf length and leaf width between pedigree genetic differences are extremely significant. The heritability estimates show that the height and blade length by moderate and strong pedigree additive genetic control, while the diameter, number of leaves and leaf width pedigree by the the weak degree to medium additive genetic control. From than the northern and higher altitude regions home department, from than southern and low-elevation areas of the home department in the district pilot of seedling growth large leaves large, leaf number, description of Schima superba seedlings growth and leaves form of the family effect there is the origin effect. The Schima height and diameter, not only the site effect is significant, and there is a significant pedigree and site interaction effect. Seedling stage measurement results based on pedigree, height standards were better central area of ??hydrothermal conditions (Fujian Jian'ou), the northern margin of the general areas (Zhejiang Longquan) and hydrothermal resource poor areas (Zhejiang Chun An excellent pedigrees of the 20 fast-growing) primaries. (2) Schima tree diameter at breast height, total number of stem straightness and a collateral, the largest branch length and the maximum collateral crude significant provenances effect by the genetic control of moderate intensity, provenance broad sense heritability of 0.34 to 0.61 smaller trunk bifurcation the Provenances effect of the the dry number and branch angle. Schima superba geographic variation patterns of growth and form of qualitative traits pilot project areas there are some differences in the the Schima superba central area Fujian Jian'ou points, major growth and the form quality traits and the origin latitude was significantly negatively related, the correlation coefficient -0.313 to -0.534, the Origin Longitude smaller, was typical latitudinal variation patterns in southern provenances grew faster, straight trunk, but many branches and thick; the Chun'an point in the northern margin of the area In addition to the total number of provenance a collateral and the origin latitude was a significant negative correlation, other growth and form quality traits and the origin latitude negative correlation is smaller. Correlation analysis found that, the Schima superba main form of quality and growth traits showed a significant positive genetic correlation genetic correlation coefficient of 0.320 to 1.164, stem straightness independent of each other with the largest branch length. The selection of two ideal weight and growth modification based selection index were elected for the Fujian of Jianou and Zhejiang Chunan point 10 growth and form quality is excellent both in excellent provenance, the former mostly southern provenances, while the latter mostly for Central provenance. (3) Schima superba leaf stable carbon isotope discrimination (Δ value) are very different, Jian'ou, Fujian, Zhejiang Chunan, and Qingyuan three pilot project areas blades Δ value of the highest and lowest seed source, respectively, a difference of 6.9%, 3.0 % and 3.7%. Provenances leaf Δ value their origin latitude was a significant negative correlation with the origin longitude smaller performance the typical latitudinal gradient mode, leaves Δ value from the southern part of the distribution of Schima superba provenances means its lower long-term water use efficiency. Afforestation site environment The leaf Δ value greater impact, The leaf Δ values ??significantly increase with the increase in the afforestation site environmental improvement and annual rainfall. Provenances blade Δ value to their height, diameter at breast height, total number of a collateral and largest branch length, etc. were highly significant positive correlation, the canopy dense fast-growing provenances higher Δ value. Two and four fast-growing, high water use efficiency (leaf Δ value is low) excellent provenances were Fujian of Jianou and Zhejiang Chunan primaries. (4) under different water and phosphorus processing parameters to try to grow the source of seedling growth, root morphology parameters and phosphorus uptake efficiency are significant genetic differences, in Fujian of Jianou and Zhejiang Longquan provenance seedling growth of large developed root system, and the high efficiency of phosphorus uptake, growth performance was significantly better than from a higher altitude origin Youxi provenance and after negative selection of Ji'an, Jiangxi provenance, and as a control Guangxi LOTUS maintain its Origin The fast-growing, drought resistance, barren but not cold characteristics. The observations of soil moisture and phosphorus level on growth and the impact of significant of Schima provenance seedlings, drought and low phosphorus stress will significantly inhibit the growth and development of Schima superba seedlings, especially Phosphorus. However, drought and low phosphorus stress Schima superba more photosynthetic products allocated to underground root system, is also high in phosphorus utilization efficiency, which may be important physiological mechanism Schima adapt to drought and low phosphorus stress. Relative to the significant main effects of seed source, moisture and phosphorus, during the interaction can be ignored.

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