Abstract
This study aims to explore the cutting propagation method of a novel variant on Taxus chinensis (Pilger) Rehd f. baokangsis (T. chinensis baokangsis). Different types of rooting powder and different concentrations were used to treat the cuttage seedlings of T. chinensis baokangsis, and then the external morphology and anatomical morphology of the roots were observed. The membership function evaluation method was used to evaluate the cutting effect. The physiological characteristics of T. chinensis baokangsis cuttings were studied by the correlation analysis of nutrient components and endogenous hormone content. The results showed that the T. chinensis baokangsis belonged to callus rooting type, and the adventitious roots differentiated at about 150 d. For rooting growth indexes, the optimal treatment was ABT-1+400 mg/L. The rooting rate of T. chinensis baokangsis was positively correlated with the content of soluble sugar, soluble starch, and IAA, while extremely significantly negatively correlated with MDA (P <0.01). Moreover, the rooting rate also was negatively correlated with ABA, ZR, and GA3, and significantly negatively correlated with GA3 (P <0.05). This study will provide some technical support and theoretical basis for the conservation and reproduction of T. chinensis baokangsis.
Highlights
Taxus chinensis (Pilger) Rehd f. baokangsis (T. chinensis baokangsis) is a new variant of Taxus chinensis var. mairei, which is monoecious in that fruit develops on male branches or male cone develop on female branches (Fei et al, 2019)
Observation of the external morphology during the process of cutting rooting of T. chinensis baokangsis The annular intumescence was observed at the incisions at the base of some cuttages at 60 d after cutting (Figure 1-A)
The ranking results of the weighted values of the membership functions as following: A1B1> A3B3> A3B2> A2B1> A3B1> A1B2> A1B3> CK1> A2B3> A2B2. These results indicated that the effect of different growth regulator treatments on the cutting propagation of T. chinensis baokangsis was different, and the optimal treatment for rooting growth index was A1B1 (D value 0.792), which is ABT-1+400 mg/L
Summary
Taxus chinensis (Pilger) Rehd f. baokangsis (T. chinensis baokangsis) is a new variant of Taxus chinensis var. mairei, which is monoecious in that fruit develops on male branches or male cone develop on female branches (Fei et al, 2019). Due to the low natural reproduction capacity of Taxus plants, the existing resources of T. chinensis baokangsis are scarce and rapid propagation is required (Li et al, 2011; Fei and Tang, 2018). The application of the plant growth regulator is a special method to promote the rooting of difficultrooted plants. Growth regulators can accelerate the growth and division of cuttage cells, and promote the flow of nutrients that can be directly available by plants to the base of cutting, and activate the cambium, and facilitate the generation of root primordia (Babaie et al, 2014; Zhang et al, 2017). Received in revised form: 10 Apr 2021. The journal will continue to appear quarterly, as before, with four annual numbers
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