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Refining the method for eggplant microspore culture: effect of abscisic acid, epibrassinolide, polyethylene glycol, naphthaleneacetic acid, 6-benzylaminopurine and arabinogalactan proteins

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Abstract

Microspore embryogenesis is an inducible pathway interesting from basic and applied perspectives. For plant breeding, it is a powerful tool to produce doubled haploids, useful as pure lines. The most efficient way to produce them is through isolated microspore culture. In eggplant, one of the most important vegetable crops, this method is still poorly explored. So far, it is possible to produce doubled haploids, but not directly from embryos, because they are converted into calli early during their development. In this work we evaluated the effect of abscisic acid, epibrassinolide, polyethylene glycol, and arabinogalactans and arabinogalactan proteins, previously described as promoters of embryo induction and development in other species. When added individually to the standard protocol, all of them significantly increased induction of microspore embryogenesis and callus cell proliferation, producing more and larger calli. Particular combinations of them further improved the efficiency of the method. In particular, gum arabic containing arabinogalactans and arabinogalactan proteins allowed embryos to progress beyond the globular stage, constituting a significant improvement in order to achieve the desired direct induction of viable, germinating embryos. We also evaluated the effect of altering the concentration and relative ratio of naphthaleneacetic acid and 6-benzylaminopurine, used in the standard protocol. Significantly better results were obtained by reducing their concentration. Together, our results shed light on the morphogenic and regulatory roles of these substances on microspore embryogenesis, opening ways to further increase the efficiency of production of androgenic doubled haploids through microspore culture in eggplant.

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Acknowledgments

We acknowledge the staff of the COMAV greenhouses for their valuable help. Thanks are also due to Dr. Rosa Peiró for her valuable statistical advice. This work was supported by the following grants to JMSS: AGL2010-17895 from Spanish MICINN, ACOMP/2012/168 from Generalitat Valenciana, and PAID-05-11 1909 from Universitat Politècnica de València.

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  1. COMAV - Universitat Politècnica de València, CPI, Edificio 8E - Escalera I Camino de Vera, s/n, 46022, Valencia, Spain

    Patricia Corral-Martínez & Jose M. Seguí-Simarro

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  1. Patricia Corral-Martínez
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  2. Jose M. Seguí-Simarro
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Correspondence to Jose M. Seguí-Simarro.

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Corral-Martínez, P., Seguí-Simarro, J.M. Refining the method for eggplant microspore culture: effect of abscisic acid, epibrassinolide, polyethylene glycol, naphthaleneacetic acid, 6-benzylaminopurine and arabinogalactan proteins. Euphytica 195, 369–382 (2014). https://doi.org/10.1007/s10681-013-1001-4

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