28⁃高芸苔素内酯对草坪种子萌发和幼苗生长的影响

Effects of 28-homobrassinolide on the turfgrass seed germination and seedling growth

摘要:

【目的】 明确不同浓度28-高芸苔素内酯对多年生黑麦草（Lolium perenne）和狗牙根（Cyn- odon dactylon）种子萌发及幼苗生长的影响。【方法】 通过盆栽和培养皿试验探究2种草坪草种子萌发率、根系形态结构、生物量等指标对28-高芸苔素内酯的响应。【结果】 狗牙根种子在4 000倍28-高芸苔·赤霉酸A3 水分散粒剂培养皿试验中表现较优，与对照清水相比，其发芽率、根系形态及生物量显著增加（P＜0.05）；在盆栽试验中，2 000倍28-高芸苔素内酯处理显著促进狗牙根幼苗生长和分枝（P＜ 0. 05）。多年生黑麦草在1 000倍28-高芸苔素内酯培养皿和盆栽试验中表现较优，与对照清水相比，其发芽率、根系形态及分蘖显著增加（P＜0.05）。【结论】 28-高芸苔素内酯能显著促进2种草坪草种子的萌发，并促进了幼苗的生长发育。本研究结果可为草坪草建植和养护管理提供一定的理论依据，可在园林绿化及运动场草坪中推广使用。

Abstract:

【Objective】 To investigate the effects of different concentrations of 28-homobrassinolide on seed germination and seedling growth of perennial ryegrass（Lolium perenne） and bermudagrass （Cynodondactylon）【Method】 The response of seed germination rate，root morphology and structure，and biomass in two turfgrass species was assessed using potand petri dish tests.【Result】The response to 28-homobrassinolide varied between grass species. In the Petri dish experiment，Bermudagrass seeds treated with 4 000 times dilution of 28-homobrassinolide? gibberellic acidA3 Water dispersible granules showed significant improvements in germination rate，root morphology and biomass compared to the control treatment （P＜0. 05）. In the pot experiments，the dilution of 2 000 times 28-ho- mobrassinolide significantly promoted seedling growth and branching （P＜0. 05）. For both Petri dish and pot experiments，the dilution of 1 000 times 28-homobrassinolide significantly promoted the germination rate，root morphology， and tillering of perennial ryegrass （P＜0. 05），compare to the control water treatment.【Conclusion】 Different concentrations of 28-homobrassinolide significantly promoted seed germination and seedling development in both perennial ryegrass and bermudagrass. The results of this study provide a theoretical foundation for the establishment，maintenance，and management of turfgrass，with potential application in landscaping and sports turf management.