Cooperation effects of GA3, IAA and uniconazole-P on tension wood formation and gravitropism in Fraxinus mandshurica seedlings  

作　　者：JIANG Sha LIU Long-hui ZHAO Na ZHENG Shu-xin XU Ke GU Song 

机构地区：[1]College of Life Science, Nankai University, Tianjin 300071, China

出　　处：《Journal of Life Sciences》2009年第9期1-7,20,共8页生命科学（英文版）

基　　金：This research was supported by the scholarship from the Japanese Ministry of Education （No. 07456073）, Scientific Research Foundation for the Returned Oversea Chinese Scholars, State Education Ministry of China, Natural Science Foundation of Tianjin, China （No. 07JCYBJCI2400 and No. 07JCYBJCI2500） and National Key Basic Research Plan Proiect （No. 2007CB 106802）.

摘　　要：The cooperation effects of GA3, IAA and uniconazole-P were studied on the gravitropism and wood formation in Fraxinus mandshurica Rupr. var.japonica Maxim. Seedlings using traditional paraffin section technology. Our results are： （1） Gravitropism of stems was strongly inhibited only in B, whereas promoted significantly in D, E, F, H and I treatments; （2） Xylem formation was increased on both sides in H, I and J treatments and on the lower side in E and F which also show the synergistic effect; （3） On the radial direction, cell wall thickness was enhanced on the upper side, whereas decreased on the lower side in C, and was also significantly promoted on the upper in E, G, H, I and J treatments. On the tangential direction, cell wall thickness was increased on the lower side in E, H, I and J treatments respectively; （4） Gelatinous layer of wood fibers was observed on the upper side in all treatments. These results suggest that both GA3 and IAA affected negative gravitropism and wood formation significantly. However, appliedor unapplited-uniconazole-P does not affect G-layer formation, indicating GA does not play the key role on G-layer formation, and ratio of GA3/IAA or IAA may be more important in regulating G-layer formation.

关 键 词：Fraxinus mandshurica seedlings GA3 IAA  uniconazole-P interactions tension wood formation 

分 类 号：S663.1[农业科学—果树学] TS653.6[农业科学—园艺学]