Study on Seed Dormancy and Germination Characteristics of Portulaca pilosa

To improve understanding of Portulaca pilosa seed germination and lay technical foundation for seedling cultivation,this paper studies the characteristics of dormancy and germination of Portulaca pilosa seed. Research indicates that its primary seed dormancy period is about25 d,dormancy can be completely released by storage at room temperature for 30 d; the seed is positively photoblastic seed that can't sprout and can be induced into dormancy in low light conditions; the dormancy-released seed is more sensitive to light when compared with the freshly picked seed,and the germination peak arises 1 d earlier; Portulaca pilosa seed favorites humid conditions,and the higher the soil moisture,the higher the germination rate and germination energy of the seed. The dormancy-released seeds should be used for Portulaca pilosa seedling cultivation,and after the germination is accelerated for 2- 3 d in the light conditions,the seeds are sown on the soil surface,and covered with transparent plastic film to keep moisture and light,which is conducive to the emergence of seeds.

毛马齿苋种子休眠与萌芽特性研究

为提高对毛马齿苋种子萌芽的认识,研究其种子休眠和萌芽的特性,为其育苗栽培奠定技术基础。结果表明：毛马齿苋种子初生休眠期约25 d,室温存放30 d可完全解除休眠;种子为严格需光发芽种子,在弱光条件下不能萌芽,能被诱导进入休眠;解除休眠的种子比新采摘种子光敏性增强,萌芽高峰提前1 d;种子萌芽喜好高湿环境,土壤水分越高,种子的发芽率和发芽势就越高。毛马齿苋育苗宜采用解除休眠的种子,在光照条件下催芽2~3 d,播种于土表,采用透明塑料薄膜覆盖,严格保湿,保证光照,利于种子整齐出苗。

浸种和外源激素处理对毛马齿苋种子发芽的影响

为提高毛马齿苋种子播种出苗率,分析不同时间浸种以及采用GA3、NAA和6-BA 3种外源激素处理对其种子发芽的影响。结果表明:浸种处理没有提高毛马齿苋种子的发芽势和发芽率的效果;GA3、NAA和6-BA三种激素浸种处理均能提高毛马齿苋种子的发芽势和发芽率;最适宜的浸种浓度分别为GA330 mg/L、10~20 mg/L NAA或6-BA 30 mg/L。其中GA3有效浓度范围较宽泛,建议采用,但GA3处理不能解除该种子发芽的需光性。

多毛马齿苋在华南地区园林绿化中的应用

指出了华南地区园林绿化中存在屋顶裸露空间绿化色彩缺乏和品种配置的不足等问题,介绍了野生乡土植物多毛马齿苋的生长习性、生态分布状况、繁殖等特性,探讨了其作为园林绿化植物所具备的优点、适合种植的区域以及在轻型屋顶绿化应用中的潜在价值,为推广应用多毛马齿苋提供参考。