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Increased endogenous gibberellin level inhibits root growth of Pinus massoniana Lamb. plantlets during long-term subculture

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Abstract

In this study, we investigated the roles of the plant hormones indole-3-acetic acid (IAA) and gibberellin (GA) in regulating Pinus massoniana Lamb. plantlet regeneration during long-term in vitro subculture. Six generations (1st, 5th, 10th, 20th, 30th and 40th with 40 days for each transfer cycle) of subcultured shoots derived from mature and juvenile explants were characterised for their different rooting capacities. In the present experiment, shoots were subcultured on rooting medium containing indole-3-acetic acid (IAA), naphthaleneacetic acid (NAA) or gibberellin (GA) inhibitor (paclobutrazol, PBZ). In addition, high-performance liquid chromatography (HPLC) was used to analyse endogenous hormone levels in shoots developed on medium with low concentrations of NAA. The concentration of endogenous IAA was highest in the 20th generation shoots, which also exhibited the strongest rooting ability. However, the highest GA concentration was observed in the 40th generation shoots, which exhibited a poor rooting capacity. For shoots subcultured for 40 generations, incubation on rooting medium containing IAA caused an enhanced root number, shoot length and survival rate. This suggested that the effects of IAA on shoot and root formation were positive. PBZ promoted plantlet regeneration from in vitro cultures but impaired shoot elongation at high levels. Furthermore, PBZ improved performance of in vitro cultures after long-term (3 to 4 y) subculture. These results suggest the inhibitory role of a high endogenous GA level in plant regeneration and the use of appropriate levels of PBZ for plant regeneration of P. massoniana.

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Funding

This work was supported by the key programme of Guangxi Forestry Bureau under Grant [2016]13, the project of Scientific and Technological Plan from the Department of Science and Technology of Guangxi under Grants 2017GXNSFAA198037, AD17195078, 2018GXNSFDA281020, AA17204087-1, and 2016GXNSFBA380224, and the Natural Science Foundation of China under Grant 31960311 and 31360178.

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  1. Yin Wang & Ruiling Yao

    Present address: Guangxi Forestry Research Institute, Nanning, 530002, Guangxi, China

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    1. Yin Wang
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    Correspondence to Ruiling Yao.

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    Editor: Wenhao Dai

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    Wang, Y., Yao, R. Increased endogenous gibberellin level inhibits root growth of Pinus massoniana Lamb. plantlets during long-term subculture. In Vitro Cell.Dev.Biol.-Plant 56, 470–479 (2020). https://doi.org/10.1007/s11627-020-10067-y

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