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首页> 外文期刊>Journal of Arboriculture >Tree growth regulator effect on phototropism - its implication for utility forestry.
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Tree growth regulator effect on phototropism - its implication for utility forestry.

机译：树木生长调节剂对向光性的影响-对实用林业的意义。

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Pruning procedures such as V-trimming or side-trimming used by electric utilities in tree maintenance programmes result in asymmetrical light exposure within tree canopies, producing the potential for phototropic growth response. The tree growth regulators (TGRs) paclobutrazol and flurprimidol are used to reduce the rate of shoot regrowth following pruning. The mode of action involves complexing of the growth retardant with cytochrome P450-dependent enzymes in the metabolic pathway for gibberellins, plant hormones responsible for shoot elongation. Because cytochrome P450 also is a part of the blue light receptor system that controls phototropism, it was hypothesized that shoot growth, as well as phototropic curvature, would be reduced by paclobutrazol and flurprimidol. Effects of soil-applied (0, 0.5, 1, and 5 ppm) paclobutrazol and flurprimidol on shoot growth and phototropism of greenhouse-grown seedlings were found to vary among species. Neither shoot growth nor phototropic curvature in American sycamore (Platanus occidentalis) was reduced by treatment with the TGRs. In contrast, shoot growth of silver maple (Acer saccharinum) was reduced by all concentrations of both paclobutrazol and flurprimidol, whereas phototropic curvature was reduced only by flurprimidol. Phototropic curvature of etiolated zinnia (Zinnia elegans 'Scarlet') was reduced by both growth regulators.
机译：电力公司在树木维护计划中使用的V型修剪或侧面修剪等修剪程序会导致树木冠层内部出现不对称的曝光，从而产生光致生长响应的潜力。树木生长调节剂（TGR）多效唑和氟草胺用于减少修剪后枝条的再生长。作用方式涉及在赤霉素（负责芽伸长的植物激素）的代谢途径中，将生长抑制剂与细胞色素P450依赖性酶复合。由于细胞色素P450也是控制向光性的蓝光受体系统的一部分，因此推测多效唑和氟草定醇会减少芽的生长以及向光性弯曲。发现在土壤中（0、0.5、1和5 ppm）多效唑和氟草定醇对温室生长的苗的芽生长和向光性的影响因物种而异。通过TGRs处理，美国梧桐（Platanus occidentalis）的枝条生长和向光性弯曲均未降低。相反，所有浓度的多效唑和氟草定醇都降低了银枫（糖槭）的幼芽生长，而仅氟草定醇降低了光致弯曲。两种生长调节剂均能降低黄化百日草（百日草线虫“ Scarlet”）的光变曲率。

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