Study On Photosynthesis Characteristic Of Tamarix Chinensis Lour. And Source-sink Relationship Of Tamarix Chinensis -C. Tubulosa

This experiment was performed at the Teaching Experiment Station in West Campus of Agricultural University of Hebei from 2008 to 2009. With Tamarix chinensis Lour. and C. tubulosa (Schenk) Wight as the study materials, the growth and development of Tamarix cutting seedlings was investigated and analyzed. After the parasitic of C. tubulosa (Schenk) Wight, four treatments followed: Control (non-inoculation C.tubulosa) , Treatment A (inoculation 1 C. tubulosa), Treatment B (inoculation 4 C. tubulosa), Treatment C (inoculation 8 C. tubulosa).The Physiological indexes of Tamarix leaves,such as the chlorophyll content, photosynthetic rate and soluble sugar content ,had been investigated and analyzed, so did the dry matter accumulation , polysaccharide, mannitol, echinacoside, eerbascoside and galactitol of C. tubulosa plant. The distribution of the photosynthate on different parts of Tamarix chinensis and C. tubulosa plant in different period was studied by ¹⁴C tracer method.Theresults were as follows:1. It was defined under the ecological conditions of the North China Plain that the final time of 1 and 2 annual Tamarix plant, first one piece leaf spread, first grade branch, flowering, full bloom and final flowers and leaves. There was only one florescence for 1 annual Tamarix plant, and two florescence for 2 annual Tamarix plant. Tamarix plant height, diameter, root length, lateral root number, a branch number, shoots and roots dry matter accumulation of each treatment were significantly different, all the indexs were CK> treatment A> treatment B> treatment C. However, R / T value each of treatment was not significant, changes in the range of 0.21-0.23.2. The chlorophyll content and photosynthetic rate of Tamarix function leaves were treatment C> treatment B> treatment A> CK, chlorophyll content increased gradually from August to October, in October reached the highest value, in November reduced. Photosynthetic rate reached a peak on September 11, varied from 28.73-32.73μmol / (kg.s), and then decreased. The photosynthetic rate showed a bimodal curve of diurnal variation. In comparison to soluble sugar content of Tamarix functional leaves from August to October, a gradually increasing tendency was observed, and the more the inoculated C. tubulosa , the more soluble sugar content.The soluble sugar content of the sample that C. tubulosa was inoculated was lower than the contrast after October. 3. Dry matter accumulation of 1 and 2 annual C. tubulosa plants at different growth stages were significantly different. Dry matter accumulation reached the highest in September, dry weight of 1 and 2 annual per plant increased 47.68g and 63.91g respectively, accounted for 21.56% and 28.90% dry weight of per 2 annual C. tubulosa plant which was 221.10g.4. Polysaccharide and mannitol content of 2 annual C. tubulosa plants were higher than the 1 annual plants at the same period, and in October reached the highest content of polysaccharide and mannitol. Polysaccharides content of 1 and 2 annual C. tubulosa plants were 9.17% and 10.36%, and mannitol content were 6.01% and 7.12% respectively. Polysaccharide and mannitol content of different parts of the C. tubulosa plants were significantly different, both were the base> the middle> the top.5. In November echinacoside and verbascoside content were the highest, reached 295.25 mg ? g^-1 and 48.25 mg .g^-1 respectively. In December galactitol content was the highest which reached 36.71 mg .g^-1. Echinacoside and verbascoside content in different parts of C.tubulosa plant were significantly different, the base was most, and the top second, then the central. Galactitol content in different parts of C .tubulosa plant was also significantly different, it was the top> the middle> the base.6. The ¹⁴C specific activity increased with the increasing of the number of the inoculated C. tubulosa. The distribution ratio of ¹⁴C assimilates in Tamarix plant decreased, while the distribution ratio in C. tubulosa plant increased significantly. From August to November ¹⁴C assimilates ratio of Tamarix and C.tubulosa plant in treatment C were 14.95%-54.03% and 45.97%-85.05% respectively. ¹⁴C assimilates ratio of Tamarix plant and C.tubulosa plant in different period were significant difference, in October reached its peak, the ratio of Tamarix plant and C.tubulosa plant were 14.95%-20.54% and 79.46% -85.05%.