Pangenesis: Graft-Hybrids
Pangenesis: Graft-Hybrids
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泛生：嫁接杂种
作者：
A. Bennett
在你的最后一期中，兰亚德先生对达尔文先生的泛生理论提出了反对意见，理由是把芽嫁接在不同物种的砧木上不会产生杂交后代。我不打算捍卫泛生论的学说，在我看来，它既无法证明也无法反驳。然而，众所周知的事实是，siock 确实影响接穗，反之亦然。亨弗雷教授在其《植物学基础课程》（马斯特博士版）中说：“园艺经验的事实表明，砧木对接穗存在一定的生理影响，例如，与嫁接在梨砧木上相比，在木瓜和枸杞上‘嫁接’时，梨的果实更小，颜色更浓，而且在山梣树上嫁接时，梨的果实更早。” Moiren 教授和其他人记录了 AbutJon 中从接穗到砧木的杂色传播的著名实例，这些实例被认为是传染病病例；但是，除了动物或植物的血液或其他“液体”受到来自另一个人的“宝石”或您所说的“宝石”的放射物的影响之外，传染理论是什么？同一位作者记录了一个实例，他认为该实例充分证实了通过将 C. purpureus 嫁接到 C. laburnum 上产生杂交 Cytisus Adami 的情况。
IN your last number Mr. Ranyard brings forward an objection to Mr. Darwin's theory of Pangenesis on the ground that the grafting of a bud on a stock of a different species does not produce a hybrid offspring. I am not about to defend the doctrine of Pangenesis, which appears to me incapable alike of proof and of disproof. It is, however, a well-known fact that the siock does affect the scion, and vice versâ. In Prof. Henfrey's “Elementary Course of Botany” (Dr. Masters's edition) he says, “A certain amount of physiological influence of the stock over the scion is shown to exist by such facts of horticultural experience as that the fruit of the pear is smaller and more highly coloured when ‘worked on’ the quince and medlar than when grafted on pear-stocks, and is earlier when worked on the mountain-ash.” The well-known instances of the communication of variegation from the scion to the stock in AbutJon, recorded by Prof. Moiren and others, are considered cases of contagious disease; but what is the theory ot contagion but that the blood or other “fluid” of an animal or plant is affected by emanations call them “gemmules” or what you will, from another individual? The same writer records an instance which he considers well authenticated of the production of the hybrid Cytisus Adami by the grafting of C. purpureus on C. laburnum.