多效唑对水仙生长和光合特性的影响

用0．01mg／L、0．05mg／L和0．10mg／L多效唑处理水仙，观察多效唑对水仙生长和光合特性的影响．结果表明：0.05mg／L多效唑可使开花期水仙植株的根、叶生长较对照组降低62．8％和33．8％，叶绿素含量增加23．0％，光合速率、光合／呼吸比率提高216．8％和234．7％，比叶鲜质量降低18．7％，显抑制植株的徒长．此外，电镜观察结果表明，在开花期和凋花期适宜浓度的多效唑使叶片叶绿体结构更为完整清晰，提高其稳定性，可能与光合效率提高有关．

The Influence of Multi-effect Triazole on Growth and Photosynthesis Characteristic of the Narcissus

Chinese narcissus(Narcissus chinensis var.chinensis Roem.) is a kind of popular seasonal ornamental flowers grown in China.Narcissus leaf easily lodges under the indoor cultivation.To solve this problem,we treated narcissus bulbs with different concentration of 0.01 mg/L,0.05 mg/L and 0.10 mg/L multi-effect triazole,the changes of growth and photosynthesis characteristic of narcissus were studied.Compared with the contrast,0.05 mg/L multi-effect triazole reduced the growth of roots and leaves of narcissus plant by 62.8% and 33.8% respectively in flowering period,increased the chlorophyll content by 23.0%,raised photosynthetic rate and photosynthetic rate/respiratory rate by 216.8% and by 234.7% respectively,and reduced specific leaf fresh weight by(18.7)%.All these results suggested that multi-effect triazole significantly inhibited narcissus plant growth and avoided the early occurrence of narcissus leaf lodge.In addition,electron microscope observation showed that the layer structures of chloroplast were more complete and clearer in florescence and blossom fall stage when the plants were treated by optimal concentration of multi-effect triazole.The stability of layer structures of chloroplast was supposed to promote the leaf photosynthetic efficiency.