光周期对穗花狐尾藻生长、开花与种子形成的影响

通过人工补光和遮光处理,初步研究了光周期对狐尾藻生长和开花的影响。研究发现:8h短日照条件不利于狐尾藻的生长和花序形成,导致狐尾藻不能正常开花和结实;与自然日照长度(平均日照14h)条件下相比,16h长光照条件可以增加植株的高度和分枝数,形成更大的生物量;但24h全光照条件对生长有抑制作用。长光照条件下,狐尾藻花序形成时间和开花时间均比自然条件下延迟,形成花序的数目也显著较自然条件下的少,但长光照条件下形成的种子比自然条件下形成的种子具有更高的萌发率。

Effect of different Photoperiods on Growth, Flowering and Seed Production of Myriophyllum spicatum L.

The effect of photoperiod on growth and flowering of Myriophyllum spicatum L.was probed by artificially increasing or decreasing light time.The seedlings were planted on water tanks and divided into four groups and subjected to different photoperiod treatment:(1) Control: natural photoperiod from May to September in Wuhan;(2) 8h short day treatment;(3) 16h long day treatment;(4) 24h full day treatment.It was found that 8h short-day photoperiod was not favorable to the growth and florence development.The florescence and flower bud formation,flowering time and the germination of seeds under different photoperiod were assessed by statistical analysis.The results demonstrated that under long term short-day,Myriophyllum could not form florescence and fruits.On the contrary,16h long-day photoperiod could increase the height,promote branching and increase biology mass.But 24h long-day treatment suppressed the growth compared to the natural photo-period condition which is average 13.5h.Under long-day photo-period,the florescence forming and flowering were postulated and the amounts of florescence were also reduced significantly.Interestingly,the seeds produced under long-day photoperiod had a higher germination rate.Our results provided ecological restoration with a new idea for obtaining the high quality seeds.