| Castanea henryi Rehd.& Wils. is an important economic tree in Fujian province. It propagates easily, grows quickly, and its fruits have rich nutrition, high value of officinal. It has a great market potential inside and outside our country. Though its fruits quality is very known in the world, its fruits are small which is lack of competitive ability. At the same time, the consumers enhance the demand of quality. The first important question is to improve the cultivar so that it can adapt to market demand, supply various quality, increase ability of market competition and content.This dissertation analyses the initial plus trees selected by selection of phenotype. It concludes analysis of different factors of effect on unit tree yield of C. henryi Rehd.& Wils., physiological and biochemical analysis on clones, the progeny test and calculation of genetic parameter, analysis of high yield and stability of clones. The main results and conclusion is presented as follows:1. The initial plus trees are selected in the excellent plantations, gained 60 excellent phenotypes. With correlation analysis, path analysis, regression analysis and clustering analysis, the results of 15 factors of effect on unit tree yield explain that tree height, crown area arid branching ability are highly significant correlations with unit tree yield. The biggest direct effect is crown area. The anthracnose resistance, the proportion of nutrient and fruited branches bring negative effects. Under the analysis of determine coefficient and direct determine degree, crown area, soil fertility, anthracnose affected and proportion of nutrient and fruited branches produce larger determined effect on unit tree yield. Crown area, soil fertility, anthracnose resistance, proportion of nutrient and fruited branches and average fruit weight have highly significant linearity correlations with unit tree yield. It can gain forecasted model 7 = 15. 296 +2. \l\x, + 0. 508 A-l. 853 Ae?. 133 *,-2. 382 xa. It is chosen 15 highest yield plus trees among the 60 trees, 9607 and 9764 are the best.2. Analyzing Chlorophyll and Carotenoid quantity, activity of POD of leaves of clones of C.henryi Rehd.& Wils., there have highly significant variety among different clones leaves. They can be indirect choice index of excellent growth of clones of C.henryi Rehd.& Wils.. The clones of the highest contents of Chlorophyll and Carotenoid are 56,18,6,24 and 31,20,39,29 respectively. The clones of the lowest activity of POD are 1,7,13,42,2.3. Testing the contents of protein, fat, dissolubility sugar and amylum, it can compare the variety among different clones. With clustering analysis, they can be clustered different combinations according to different demands. But the 14 clone is the highest in all nutrient contents.4. From the progeny test on the clones, with the analysis of variance, correlation, clustering and calculation of genetic parameter, the following conclusions can be found: (l)The choosing of C.henryi Rehd.& Wils. by phenotypes is effective from the result of significant or highly significant level among clones. (2) Real yield and tree height, crown, crown area have highly significant correlation, which indicates that thecondition of growth effects on yield. The average crown area yield and resistance index have highly significant level, which explain that affected correlate with the transmissibility. (3) The repeatability of clones are between 0.297 and 0.965, most of them are middling level. The repeatability and genetic gains of crown area, real yield and unit tree yield are larger. (4) The clones with high unit crown area yield have lower resistance, such as 1 and 27 clones.5. Analysing the fertility and stability of clones, results of variance in single site indicate that the characters, except basal diameter, have highly significant variance. Synthesizing the effect of environment, the interaction of clones and sites has not variance, which explain that different clones are stable. The result of g... |
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