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10 June 1991, Volume 20 Issue 02 Previous Issue    Next Issue

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THE EFFECTS OF SOIL APPLICATION OF MAGNESIUM FERTILIZERS ON THE CORRECTION OF MAGNESIUM DEFICIENCY IN GUANXI HONEY POMELO TREES Xie Zhinan, Zhuang Yimei, Wang Renji, Xu Wenbao, Huang Yuzong 1991, 20(02): 1-9.  Abstract ( )   PDF (607KB) ( )   The present experiment was conducted in 1988-1991 in Ping-he County of south Fujian to study the effects of soil application of calcium magnesium phosphate and magnesium sulphate on the correction of Mg deficiency in Guanxi Honey Pomelo (Citrus grandis) trees during full fruit period. The experimental design consisted of seven treatments with soil application rate of calxium magnesium phosphate and magnesium sulphate, i.e. MgO at 0.16, 0.32 and 0.48 kg·tree-1·year-1, respectively, and the control (no Mg fertilizer). The application of two magnesium fertilizers to the soil had a der-tain effect on the increasing amount of available Mg and the decreasing ratio of K/Mg, Ca/Mg in the soil, as well as the increasing content of Mg, Chlorophyll and the decreasing rafio of K/Mg, Ca/Mg in the leaf. In addition,the soil application of Mg fertilizers resulted in an increase of the growth of spring shoots and fruit yield. It was found from our study that both medium and high level of Mg fertilizer application induced good effect on correcting Mg deficiency. Moreover, there was a definite tendency of a better influence of the calcium magnesium phosphate than that of the magnesium sulphate.The authors recommend that the optimum amount of calcium magnesium phosphate in red soil pomelo orchard is 1.5-2.0kg·tree-1·year-1. Related Articles | Metrics

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DIFFERENCES IN STORABILITY OF CUT CHRYSANTHEMUMS AS RELATED TO PHYSIOLOGICAL ASPECTS Su Jun 1991, 20(02): 10-13.  Abstract ( )   PDF (289KB) ( )   The differences in storability of cut chrysanthemums flowers harvested at different devleopment stages were studied based on some physiological aspects. Chrysanthemum flowers were harvested at two stages (flower diameter was 4-5 cm at stage I and 7-8 cm at tage Ⅱ) and stored at 0±0.5℃ for 4 weeks. The flowers were spamled at one-week intervals to analyse the soluble sugar content and the activities of per-oxidase, catalase and Polyphenol oxidase. The result showed that the soluble sugar content at stage Ⅱ was higher when flowers were harvested and remained a higher level during storage. The activity of peroxid-ase at both stages was similar at the beginning and gradually increased throughout the storage period,while at stage I it increased more rapid-y than that at stage Ⅱ. The peak value of the curve of catalase activity at stage Ⅱ appeared later and the range of changes was narrower.The behaviour of Polyphenol oxidase activity changes were similar at both stages. It suggests that enzyme activity is one of the factors influencing the storability of the chrysanthemum cut flowers. Related Articles | Metrics

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EFFECT OF CALCIUM ON RESPIRATION OF POSTHARVEST BANANA FRUITS Chen Xiaoming, Huang Weinan, Lu Rongxin 1991, 20(02): 14-19.  Abstract ( )   PDF (421KB) ( )   Changes of water soluble calcium in banana (Musa acuminata cv. ‘Dwarf Davendish’) fruits during ripening were studied to determine the relationship between internal calcium changes and Postharvest, respiration.The effects of calaium on Postharvest respiratory characteristics of banana fruits were determined by vacuum infiltration with solutions containing calcium chloride. The results showed that water soluble calcium in both banana Peel and pulp increased with ripeness, especially at the onset of respiration climacteric rise. The appearance of climacteric peak was delayed in banana fruits infiltrated with 0.05 mol/l and 0.1 mol/1 calcium chloride. The results suggest that the increasing of water soluble calcium is a stimulative at the onset of respiratory climacteric, and that calcium treatment reduces both the ethylene level in fruit tissues and the sensitivity to endogenous ethylene, thus delaying the aPPearance of clima-cteric peak. Related Articles | Metrics

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A PRELIMINARY STUDY ON THE GENUS BAGOPA IN FUJIAN PROVINCE Chen Hengbin, Chang Yongtian 1991, 20(02): 20-22.  Abstract ( )   PDF (190KB) ( )   This Paper deals with three species belonging to the genus Bacopa Aubl. of family Scrophulariaceae in Fujian Province. They are B. floribunda R. Br., B. monnieri (L.) Pennell and B. repens (Sw.) Wettst., the last one is a new record for China as a naturalized Plant, and Sinobacopa aquatica Hong is a new synonym for it. Hence, the genus Sinobacopa Hong must be incorporated into Bacopa Aubl. At the same time, the au-ther's name of B. monnieri is corrected. Related Articles | Metrics

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EFFECTS OF FGR ON FRUIT SETTING AND SHOOT GROWTH IN ‘SHUIZHANG’ LONGAN TREES Su Minghua, Liu Zhicheng, Huang Zhenliang 1991, 20(02): 23-27.  Abstract ( )   PDF (321KB) ( )   Effects of FGR on fruit setting and shoot growth in ‘Shui-zhang’ longan trees were studied during 1990-1991 in south China. The two-year studies indicated that the application of FGR at 1000-3000 ppm to longan trees in mid-April had a significant effect on the increased number of fruit setting. With FGR at 3000 PPm,the increased number of fruit setting was 1.38 and 1.07 times higher in 1990 and 1991, respectively, than that of the check (P≤0.05). The quality of the fruits and shoot growth were not adversely affected in all treatments. Related Articles | Metrics

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LIGHT AND ELECTRON MICROSCOPIC STUDIES ON THE ROOT NODULE CELLS OF Leucaena leucocephala Wu Yide 1991, 20(02): 28-32.  Abstract ( )   PDF (1294KB) ( )   Plants of Leucaena leucocephala were inoculated with Rhizo-bia,and nodules were sampled for light and electron microscopic observation. The nodule of Leucaena leucocephala is composed of four Parts of different structural form, i. e. meristematic cell, cortical cell, vascular system and infected cell zone. Rhizobia infected cells by the infection thread that released into the host cytoplasm and gradually turned to N2-fixation bacteroids. Bactero-ibs have three associated membrane systems:bacteroid cytoplasmic membrane, bacteroid cell wall, and plant-derived membrane envelope, or peribacteroid membrane. The early bacteroid was enclosed in a membrane envelope. It was observed that each membrane envelope in older infected cells contained more than one bacteroid. In the infected cells of mature nodule the bacteroids were enclosed in groups of two to five within their membrane envelopes. Prominent electron-translucent granules within the bacteroid were Probably Poly-β-hydroxybutyric acid. These changes are described in detail and the significance of the cell structural changes and their functional correlation to the development of root nodules are discussed in the present paper. Related Articles | Metrics

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ANALYSIS OF THE CHEMICAL COMPOSITIONS IN ESSENTIAL OIL OF Pelargonium roseum ACCLIMATIZED IN YUNNAN PROVINCE Yan Dongwei, Zhang Zheng, Ouyang Ning 1991, 20(02): 33-35.  Abstract ( )   PDF (186KB) ( )   Pelargonium roseum was introduced into Yunnan and has been uccessfully acclimatized, and has begun to be set out extensively. The chemical compositions in the ssential oil extracted at the main growing periad of the plant were analysed. The result showed that the Percentage of geraniol increased while that of citronellol decreased from May to October. The odor characteristics of the essential oil of Pelargonium roseum was different from that of P. graveolens Produced in Yunnan and was similar to that produced in Bourbon. Related Articles | Metrics

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THE PROTECTIVE EFFECT OF EXOGENOUS CHOLESTEROL ON ISOLATED PROTOPLASTS DURING FREEZING AND THAWING Guo Jinquan, Yang Yunzhu, Chen Wentao 1991, 20(02): 36-39.  Abstract ( )   PDF (281KB) ( )   The survival percentage of wheat (Triticum aestivum) meso-phyll protoplasts was higher than that of the control after freezing and thawing treatments in the presence of cholesterol at proper concentration (0.1-0.4 m mol/L), and 0.4 m mol/L cholesterol was the optimum concentration to protect wheat isolated mesophyll protoplasts. A similar effect on resistance to freezing of mesophyll protoplast in cabbage (Brassica oleracea var. capitata) was found. It suggests that the integration of exogenous cholesterol with plasmolemma acts on stabilizing plasmolemma-constitution and maintaining normal function. Related Articles | Metrics