Chauhan Bhagirath Singh
The Centre for Plant Science, Queensland Alliance for Agriculture and Food Innovation (QAAFI), The University of Queensland, Toowoomba, Queensland 4350, Australia.
Sci Rep. 2016 May 13;6:26006. doi: 10.1038/srep26006.
Hibiscus tridactylites is a problematic broadleaf weed in many crops in Australia; however, very limited information is available on seed germination biology of Australian populations. Experiments were conducted to evaluate the effect of environmental factors on germination and emergence of H. tridactylites. Germination was stimulated by seed scarification, suggesting the inhibition of germination in this species is mainly due to the hard seed coat. Germination was not affected by light conditions, suggesting that seeds of this species are not photoblastic. Germination was higher at alternating day/night temperatures of 30/20 °C (74%) and 35/25 °C (69%) than at 25/15 °C (63%). Moderate salinity and water stress did not inhibit germination of H. tridactylites. Seedling emergence of H. tridactylites was highest (57%) for the seeds buried at a 2 cm depth in the soil; 18% of seedlings emerged from seeds buried at 8 cm but no seedlings emerged below this depth. Soil inversion by tillage to bury weed seeds below their maximum depth of emergence could serve an important tool for managing H. tridactylites.
三叶芙蓉是澳大利亚许多作物中一种棘手的阔叶杂草；然而，关于澳大利亚种群种子萌发生物学的信息非常有限。开展了实验以评估环境因素对三叶芙蓉萌发和出苗的影响。种子擦伤刺激了萌发，这表明该物种萌发的抑制主要归因于坚硬的种皮。萌发不受光照条件的影响，这表明该物种的种子不是需光种子。在30/20 °C（74%）和35/25 °C（69%）的昼夜交替温度下的萌发率高于25/15 °C（63%）时的萌发率。中等盐度和水分胁迫并未抑制三叶芙蓉的萌发。三叶芙蓉种子埋于土壤2厘米深度时的出苗率最高（57%）；埋于8厘米处的种子有18%出苗，但在此深度以下没有种子出苗。通过耕作进行土壤翻转，将杂草种子埋于其最大出苗深度以下，可能是管理三叶芙蓉的一项重要手段。
