| Base on the classification of life cycle forms, environmental regulation of life cycle forms of Catharanthus roseus was investigated under different habitates, such as temperature, light intensities and substrate.There are five morphological characteristics selected to represent resource distributions among vegetative growth (V), sexual reproduction (S) and clone reproduction (C), respectively. Principal component anlysis was adapted to quantify and classify the type of life cycle forms. C. roseus was widely used in pharmacy, in which alkaloid is provided with anticancer function. Structure-building substance was changed along with the change of life cycle forms. Expection is that the conclusion will direct the cultivation and production.Changes of life cycle forms of C. roseus were regulated by different temperatures. After treated under 15℃, 25℃and 35℃, life cycle forms of C. roseus seedlings were V0.9734S0C0.0265, V0.9221S0C0.0799 and V0.8468S0.1056C0.0474. It was showed that energy gradually transfered to sexual reproduncton with temperature increased.Changes of lifecycle forms of C. roseus were happened by treatment of different light intentsities. Experiment contains two parts. The frist one is different light intensity, another one is different degree of overshadow. After treated with different light intensities, life cycle forms of C. roseus seedlings were V0.897S0.071C0.032, V0.841S0.136C0.022 and V0.741S0.240C0.018.Different substrates treatments were set in this research. Four kinds of substrates were respectively 100％soil, 80％soil+20％clay, 40％soil+60％clay and 100％clay. The result indicated that growth will be worse by the higher ratio of clay and the energy also transferred to sexual reprodunction.Life cycle forms and physiological response of C. roseus were changed by harvest treatment. The life cycle forms of those seedlings controlled and post-harvested were V0.3638S0.6174C0.0187 and V0.2847S0.6684C0.0469. It was evident to find that the percentage of growth reproductive increased and the forms changed from SV to SC. Apical dominance was inhibited and branches developed significantly. Alkaloid levels were observed to be increased after harvest. |
