Integration Of Research, Based On The Physiology Of Different Nitrogen Forms Conditions Commelina

Commelina benghalensis L. is an herb from genus of Commelina L., and is commonly distrabuted in croplands in China. In some areas of Africa and America, C. benghalensis L. has been reported as uncontrolled weed, but in our country there is no report about this. Nitrogen as an essential element for the growth of plant, plays important roles in the growth and development of Commelina benghalensis L. In this paper, over-ground large seeds of Commelina benghalensis L. are studied as experimental material. The plantings from over-ground large seeds were treated by three types of nitrogen form: nitrate nitrogen, ammonium nitrogen and both nitrate and ammonium nitrogen. There are two group, high concentration of nitrogen and low concentration of nitrogen, in the every type of nitrogen form. After seven days, parameters of leaves of plants, such as fluorescent parameters, content of NO3-and NH4+, the activity of NR and GS, and also biomass of each type of modules were measured. I came to the conclusion that the growth of Commelina benghalensis L. from high concentration of nitrate nitrogen were the most of bloom, namely, Commelina benghalensis L. preferred nitrate to ammonium nutrition. As the reduction of concentration of nitrogen nitrogen, Commelina benghalensis L. could growth commendably with some ammonium nitrogen supplied. It's requirement of nitrogen is very low in the specifically condition. By studying the process of nitrogen assimilation, I found that Commelina benghalensis L. maintain its growth and development by increasing the improvable efficiency of nitrogen nitrogen. Considering of its speciality of avail of nitrogen, and the characteristic of fertilization in our country, I can speculate that superfluous fertilization is the reason of which deos not make Commelina benghalensis L. become a kind of uncontrolled weed.As C. benghalensis L. is doing the asexual reproduction depending on its stolon, it can be viewed as a typical clonal plant. Physiological integration is one of focal researches of clonal plants. To study physiological integration of nitrogen of C. benghalensis L., I planted plants in four ways of every form of nitrogen: 1) Both of genet and ramet developed in complete Hoagland liquor, 2) Genet in Hoagland liquor lack of nitrogen while ramet in complete Hoagland liquor, 3) Genet in complete Hoagland liquor while ramet in Hoagland liquor lack of nitrogen, 4) Both of genet and ramet developed in Hoagland liquor lack of nitrogen. Seven days later, parameters of leaves of plants, such as fluorescent parameters, content of NO3-and NH4+, the activity of NR and GS, and also biomass of each type of modules were measured. I came to the conclusion that nitrogen would transfer between genet and ramet, and orientation of transfer was from ramet to genet when plants were developed as genet in Hoagland liquor lack of nitrogen while ramet in complete Hoagland liquor, which proved physiological integration did exit in C. benghalensis L.. I also calculated the value of integration intensity by content of nitrogen of three forms of nitrogen which were 76.88%,47.67%,42.63%. Another result was that assets distribution of plants of C. benghalensis L. was affected by physiological integration. In the environment of nitrate nutrition and in the environment of ammonium nutrition, among these four ways, percentage of nutrient modules was the least while that of reproductive modules (flowers) was the most when both genet and ramet in complete Hoagland liquor. However, when genet was developed in complete Hoagland liquor but ramet in liquor lack of nitrogen, percentage of flowers decreased. But in the environment of both nitrate and ammonium nutrition, when genet was developed in complete Hoagland liquor but ramet in liquor lack of nitrogen, percentage of nutrient modules was the least while that of reproductive modules was the most. In all of the three kind of nitrogen environment, when genet was in Hoagland liquor lack of nitrogen but ramet in complete liquor, percentage of flowers was still more than the percentage in condition of both of them lacking of nitrogen. The results showed condition of ramet affected on asset distribution of the whole plant.