Improved horticultural practices may help to reduce demand for wild cycads threatened by unsustainable collection. We determined the influences of leaf retention with or without anti-transpirants on the success and speed of adventitious root development of Zamia furfuracea L.f. and Zamia integrifolia L.f. stem cuttings. Root formation success for both species was greater than 95%. The experimental treatments did not influence the percentage success or the speed of root development for Z. furfuracea or Z. integrifolia. The ending dry weights of the stems, leaves, and roots were also not influenced by the experimental treatments. Our results indicated that adventitious root formation on stem cuttings of these two Zamia species was highly successful with or without retained leaves, and horticultural application of transpiration-reducing products on retained leaves did not improve success. Our findings add to the growing body of evidence that show how the horticulture nursery industry can meet horticultural demands in an effort to stop wild harvesting of threatened plants. Conservation of cycads as a group would benefit from more horticulture studies such as this, especially if the research includes threatened species.

中文翻译：

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含或不含抗蒸腾剂的两种 Zamia L. 种茎插条上的叶片保留不改善不定根的形成

改进园艺做法可能有助于减少对因不可持续采集而受到威胁的野生苏铁的需求。我们确定了使用或不使用抗蒸腾剂的叶片保留对 Zamia furfuracea Lf 和 Zamia integrifolia Lf 茎插条不定根发育的成功和速度的影响。两种物种的根形成成功率均大于 95%。实验处理不影响 Z. furfuracea 或 Z. integrifolia 的成功百分比或根发育速度。茎、叶和根的终末干重也不受试验处理的影响。我们的结果表明，无论有没有留叶，这两种 Zamia 物种的茎插条上的不定根形成都非常成功，减少蒸腾作用的产品在保留叶上的园艺应用并没有提高成功率。我们的发现增加了越来越多的证据，这些证据表明园艺苗圃业如何满足园艺需求，以努力阻止对受威胁植物的野生收获。将苏铁作为一个整体进行保护将受益于更多此类园艺研究，尤其是在研究包括受威胁物种的情况下。