Nodulation Structure in Rosa omeiensis Rolfe and Its Relationship with Itself

doi:10.7525/j.issn.1673-5102.2017.04.005

Abstract

Abstract: We studied the occurrence of nodulation on Rosa omeiensis Rolfe and their regularity as well as the reasons of nodulation in the area of Xiongse Nature Reserve of Lasa in Tibet Autonomous Region, and checked the ecology effect of distribution of R.omeiensis on other shrubs Results show that:(1)The nodulation was organized by the hyperplasia of xylem, dense tissue forming irregular annulation without pulp. Its enlargement due to meristem tissue formation of plant tumors, which mainly formed by the square cells size of about 10-15 μm×25 μm×30 μm; (2)The occurrence of nodulation is closely related to the growth condition of its own. The relationship between the occurrence of nodulation, the density and the altitude gradient was not significantly great, while it has a significant correlation with the coverage and the height of the plant(P=0.0081<0.01); (3)Within the scale of the study area, nodulation can be found in over 9-year R.omeiensis, as an important species of discrete distribution in the area with no correlation with other brush. To maintain the competitive advantage of shrub and whole population, it was achieved by self-thinning effect with nodulation. The nodulation of R.omeiensis is formed in the long-term evolution process. The rapid growth and death of the individuals in the shrubs is realized through the nodulation. Through nodulation, the competitive advantage of brush and the entire population is kept.

Key words: Rosa omeiensis Rolfe, nodulation, importance value, self-thinning effect

CLC Number:

Q949.751.8

MA Chao, PUBU Duoji, CHEN Bin, XU Ai-Guo, JIANG Si-Ping. Nodulation Structure in Rosa omeiensis Rolfe and Its Relationship with Itself[J]. Bulletin of Botanical Research, 2017, 37(4): 514-520.

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