Effect of plug cell、seedling age、transport stress and chemical pretreatment on development and senescence of Impatiens

• Main Authors: Wen-yi Liao, 廖文毅
• Other Authors: 林瑞松
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/20712280162370402432

碩士 === 國立中興大學 === 園藝學系所 === 97 === This experiment mainly researches in the influences of growth of Impatiens walleriana ‘Acce Coral’on the different plug cell and seedling age, and in the probe into the biological response and the hazard factor of the plug seedling, and in the attempt, through simulating dark transport, to find out the feasibility to reduce the damage from the transport stress to Impatiens Walleriana by utilizing the chemical pretreatment prior to the transport. Plug seedling with different plug cell and seedling age, in the early growth of week four and five, the plant height, the weights of fresh and dry of both the shoot and roots growth better in round-square shape, but in week seven, the growth has no obvious difference among each plug cells. The seedling index of plug seedling has no significant change in week four and five, but it increases quickly in week six and has little difference from week seven. The root activity decreases along with the increase of the growth weeks; There is no obvious variation among the different plug cells. Plug seedling, after two, four and six days of simulating dark transport; along with the increase of the dark days, improves the respiration rate and ethylene production. The root activity drops from the control group of 2.95 O.D./g FW to 0.78, 0.94 and 0.95 O.D./g FW respectively. The root activity has a noticeable trend to go down with day four of the dark treatment. The contents of the chlorophyll a, the chlorophyll b and the total chlorophyll of the leaf blade under the first node of the stem drop apparently in day six, and there is no obvious difference among plug cells; the content of the chlorophyll of the leaf blade under the second node of the stem drop apparently in day four of the dark days. Through the dark transport, the leaf blade under the second node of the stem, compared to that of the first node, has lower content of the chlorophyll. The growth of the plug seeding, after the simulation of dark transport treatment for two, four and six days and transplanted for two weeks, has taller plant height with the four and six dark days treatment; however, the weights of fresh plant and dry plant the fresh root and dry root are lighter than the control group. After the dark treatment and transplanted, there is no big variation in the content of the chlorophyll among treatments. Potted Impatiens Walleriana, treated with plant growth retardants or antitranspirant prior to the simulation of dark transport treatment, cannot effectively reduce the ethylene production. While the days of transport increases, the ethylene production also grows; and it results in the decrease of the chlorophyll and root activity, and leads to the serious abscission of flower buds and 20% reduction in diameter of flowers.