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为探索竹类植物秆形生长机制,研究利用激素调控竹材纤维生长质量,采用不同质量浓度(0、20、40、60mg/L)赤霉素(GA_3)处理毛竹实生苗,观察并测定处理后新分蘖竹株数量、秆形及竹材纤维质量变化情况。结果表明:毛竹实生苗叶面喷施不同浓度GA3后,新分蘖竹株秆高、节间长和叶片数量均有极显著增加(P<0.01),20、40和60 mg/L GA_3处理实生苗新分蘖竹株秆高分别比对照(0 mg/L)增长0.56、1.19和1.21倍,平均节长度增加0.49、1.05和1.10倍,叶片数量增加35.61%、48.35%和38.68%;新分蘖竹株数量、单株节数和地径在处理与对照之间无显著差异。伴随秆形变化,新分蘖竹株竹材纤维质量也有所改变。20、40和60 mg/L GA_3处理,明显增加了新分蘖竹株竹材纤维细胞长度,分别比对照增加13.17%、20.68%和21.46%;但各处理对竹材纤维细胞的宽度作用不显著,从而使得处理后竹株竹材纤维的长宽比增加,有利于竹材纤维质量提升。另外发现,不同浓度GA_3处理对竹材纤维细胞的壁厚、腔径和纤维组织比量的影响不显著。分析认为,赤霉素处理能显著改善毛竹实生苗新分蘖竹株的竹材纤维质量,但对提高竹材纤维产量无显著作用。
In order to explore the stalk growth mechanism of bamboo plants, the hormone quality was used to control the bamboo fiber growth quality. The seedlings of bamboo plant were treated with GA 3 at different concentrations (0, 20, 40 and 60 mg / L) The number of new tillers, the number of stalks and the changes of bamboo fiber quality. The results showed that the leaf height, internode length and leaf number of new tillering bamboo increased significantly (P <0.01) after spraying GA3 at different concentrations on the foliage of bamboo seedlings, and the treatments of 20, 40 and 60 mg / L GA_3 Compared with the control (0 mg / L), the stalks height of seedling new tillers increased by 0.56, 1.19 and 1.21 times respectively, the average length of nodes increased by 0.49, 1.05 and 1.10 times, and the number of leaves increased by 35.61%, 48.35% and 38.68% There was no significant difference in the number of plants, the number of nodes per plant and the diameter of ground between treatment and control. With the change of stalk, bamboo fiber quality of new tillering bamboo also changed. 20, 40 and 60 mg / L GA_3 significantly increased the length of bamboo fiber of new tillering bamboo plants, which increased by 13.17%, 20.68% and 21.46% respectively compared with the control; however, the effect of each treatment on the width of bamboo fiber cells was not significant The bamboo fiber length-width ratio increases after treatment, which is in favor of bamboo fiber quality improvement. In addition, it was found that the effects of different concentrations of GA_3 on the wall thickness, cavity diameter and the ratio of fibrous tissue were not significant. The results showed that gibberellin treatment could significantly improve the bamboo fiber quality of the new tillering bamboo plantlets, but had no significant effect on the bamboo fiber production.