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10 June 1990, Volume 19 Issue 02 Previous Issue    Next Issue

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THE FLUCTUATION OF MINERAL ELEMENTS IN THE DEVELOPING FRUITS OF Citrus unshiu Cheng Xiangdong, Cheng Yingbo, Huang Qiuiin, Yang Yuzen 1990, 19(02): 1-5.  Abstract ( )   PDF (342KB) ( )   The fluctuation of N, P, K, Ca, Mg, Fe, Mn, Zn, Cu and B concentration in fruits of Citrus unshiu at different developing stages differed from that in leaves. Generally, the concentration of the mineral element in fruit was lower than that in leaf; the concentration in fruit reached the peak stags earlier than that in leaf. The changes of concentration of these elements in fruits were more complicated before July. However, they tended to te stable after September. Whether the optimum period for sampling fruit is in September and early October to make the nutrient diagnosis of citrus is also discussed. Related Articles | Metrics

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NODULATION AND NITROGEN FIXATION IN Elaeagnus conferta Cai Keqiang, Lan Gu, Huang Weinan 1990, 19(02): 6-10.  Abstract ( )   PDF (361KB) ( )   Elaeagnus conferfa is a tropical fruit tree, which is one of Actinorhizal plants, bearing perennial, multiple branching, coralloid no-dule clusters. The nitrogenase activity of nodule clusters of the plant was higher than that of the eight species of non-leguminous nodulated plants determined in Xiamen. The seasonal variation of nodules nitrogenase activity was found higher in autumn and summer than in spring find winter. The optimum temperature for nitrogen fixation of nodules ranged 25-30℃. The nitrogenase activity reduced below 25℃ or Over 30℃. The uptake hydrogenase activity of nodules was 9.52 μmol H2/g·FW/h, When adding 5% H2 to reaction system, nitrogenase activity in nodules increased markedly. The in vivo nitrate reductase (NR) activity in E. conferta young trees was determined. The NR activity in different organs was in the order roots > nodules > leaves > shoots.NR activity in leaves was higher in autumn and summer than in spring and winter. Related Articles | Metrics

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INFLUENCE OF ORGANIC-MINERAL FERTILIZER RATIO ON SOIL CHARACTERISTICS OF CITRUS ORCHARD IN THE RED EARTH Zhuang Yimei, Xie Zhinan, Wang Renji, Xu Wenbao, Chen Lixuan 1990, 19(02): 11-16.  Abstract ( )   PDF (412KB) ( )   The fertilizer test conducted during 1985-1988 revealed that the soil characteristics were improved with the application of organic manure in the fertilizer ratio, namely, most enzyme activities and main nutrient contents increased. Our study suggested that the optimum amount of organic fertilizer in the red soil citrus orchards was about half of annual nitrogen fertilizer. Related Articles | Metrics

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ISOLATION AND CHARACTERIZATION OF RHIZOBIUM FROM Psophocarpus tetragonolobus Lan Gu, Cai Longxiang, Huang Weinan 1990, 19(02): 17-21.  Abstract ( )   PDF (2538KB) ( )   A slow-growing Rhizcbium strain Ps was isolated from root nodules of Psophocarpus fetragonolobut. It was Gram-negative rod (0.59×1.49 μm) with subpolar flagella. Long doubling time (15.52 h) in YM liquid medium was observed. It did not grow both in 1.5% NaCl and at 39℃. When inoculated, nodules can be formed on the host plants. The ni-trogenase activity has been determined. Physiological and biclogical characteristics of strain Ps were systematically studied. Related Articles | Metrics

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SELECTIVE BREEDING OF RECOMMENDED VARIETIES OF Actinidia chinensis Yang Wenbo, Zhou Rucan 1990, 19(02): 22-26.  Abstract ( )   PDF (2016KB) ( )   Some recommended varieties were selected from wild Chinese gooseberries (Actinidia chinensis), They included:1. Xiaya-l and Xiaya-40 (early variety); 2. Xiaya-15 (medium variety); 3. Xiaya-20 (Late variety); and 4. Xiaya-18 (male plant), pollinizer for early, medium and late varieties. These varieties were characterized by early fruiting; high and stable yielding with high fruit quality. The plants were adaptable, which exhibited production trait as well as stable inheritable character when grown in lower altitude of south subtropical region. Hence, these varieties were recommended as main commercial Chinese gooseberry varieties in Xiamen. Related Articles | Metrics

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COMMUNITY CHARACTERISTICS OF EVERGREEN BROAD-LEAVED FORESTS IN DAIYUNSHAN NATURAL RESERVE Luo Guangtan, Ye Youqian 1990, 19(02): 27-34.  Abstract ( )   PDF (547KB) ( )   The analysis of the florastic compositions, specific compositions, life forms, leaf qualities and community structure demonstrated some distinctive characteristics of the transistion from middle subtropical evergreen broad-leaved forest to south subtropical monsoonal evergreen broad-leaved forest in Daiyunshan Natural Reserve. Related Articles | Metrics

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EFFECT OF GIBBERELLIN ON FLOWER-BUD DIFFERENTIATION IN “SHUIZHANG” LONGAN TREES Su Minghua, Liu Zhicheng, Liu Huiwan 1990, 19(02): 35-39.  Abstract ( )   PDF (317KB) ( )   Gibberellin at 100-300 ppm was applied to "Shuizhang" long-an trees in late November. Results showed that gibberellin had effects on flower-bud differentiation. The responses of the trees to gibberellin, however,were different in on-year and off-year.Flower cluster rate tended to increase with the decreasing gibberellin concentration. Gibberel-lin at 100ppm had significantly promotive effect on flowering in off-year, whereas it had no effect in on-year. The development of flower clusters, summer and autumn shoots were not adversely affected in all treatments. Related Articles | Metrics

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MASS PROPAGATION OF CITRUS SEEDLINGS Chen Ligeng 1990, 19(02): 40-45.  Abstract ( )   PDF (387KB) ( )   Epicotyl,hypocotyl and cotyledon of trifoliate orange and sour orange tubed-seedlings were taken as materials in the experiment and cut into several segments, and cultured in vitro. The results showed that the highest percentage adventitious buds formation occured on MS medium added with 10-4 or 5×10-5 mol BA, the total number of mean adventitious buds per trifoliate orange explant was up to 41 and 33.5,respectively;the most adventitious buds were formed on the first epicotyl and hypocotyl. Fewer produced aventitious tuds on MS medium supplemented with KT in all treatments.Percentage rooting was the highest on MS medium containing 10-5 mol NAA. 15-20 days after transferred to MS medium added with 5×10-6 or 10-6 mol NAA, the adventitious buds of trifoliate orange rooted and plantlets produced. The number of adventitious buds formed in sour orange was significantly less than that in trifoliate orange in the same treatments. Related Articles | Metrics

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ANALYSIS OF CHEMICAL COMPOSITIONS IN DWARF YLANG YLANG OIL Chen Peiyang, Huang Shicheng, Ding Desheng 1990, 19(02): 46-52.  Abstract ( )   PDF (410KB) ( )   The chemical compositions in three kinds of ylang ylang essential oil were analysed by GC and GC/MS. 39 compounds were identified from the oil of dwarf ylang ylang grown by grafting, which represented 90.68% of total oil, 29 compounds from the oil of high ylang ylang (seedling plant) and 30 compounds from imported ylang ylang oil,representing 74.62% and 73.58% of total oil, respectively. Although the three kinds of oil vary greatly in chemical compositions and their content, there is no significant difference in odor characteristics as a whole. They are all available for compounding materials. Related Articles | Metrics