Callus induction and plant regeneration from anthers of Dendrocalamus latiflorus Munro |
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Authors: | Guirong Qiao Haiying Li Mingying Liu Jing Jiang Yafang Yin Ling Zhang Renying Zhuo |
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Affiliation: | 1. State Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry, Xiangshan Road, Beijing, 100091, China 2. Key Laboratory of Tree Genomics, The Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Fuyang, Zhejiang, 311400, China 3. The Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing, 100091, China
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Abstract: | Bamboo varieties are very difficult to improve by traditional breeding methods. Here, we established an efficient plant-regeneration system for Dendrocalamus latiflorus (tropical giant bamboo) by anther culture. Culture conditions, especially the plant growth regulators required for callus induction and shoot differentiation, were optimized by orthogonal design. M8 medium supplemented with 5.37 μΜ α-naphthaleneacetic acid (NAA), 1.33 μM?N 6 -benzyladenine (BA), 110.17 μM phenylacetic acid (PAA), and a pretreatment time of 3 d produced the highest rate (5.08?±?0.61%) of callus induction. The maximum shoot differentiation rate reached 28.3?±?4.29% in M8 medium supplemented with 2.32 μM kinetin (KT), 8.89 μM BA, 1.08 μM NAA, and 110.17 μM PAA. The results of the ploidy level test showed that most of the regenerated plants were dodecaploid (96/100), a few were hexaploid (3/100), and one was triploid (1/100). The average chlorophyll content of dodecaploid lines was significantly higher than that of hexaploid lines. The present study provides an innovative method for bamboo ploidy breeding and a useful method for genetic improvement. |
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