EFFECT OF MICROPROPAGATION CONDITIONS ON ADVENTITIOUS BUDS FORMATION AND THE CIRCADIAN EXPRESSION OF THE ACO013229.1 GENE IN ANANAS COMOSUS

Ahmed, Manal; Abo El-Fadl, Reda; Suliman, Mohamed; Abd Elaziem, Tamer

doi:10.21608/ejdr.2022.101746.1088

EFFECT OF MICROPROPAGATION CONDITIONS ON ADVENTITIOUS BUDS FORMATION AND THE CIRCADIAN EXPRESSION OF THE ACO013229.1 GENE IN ANANAS COMOSUS

Document Type : Original Article

Authors

¹ Tissue Culture Unit, Department of Genetic Resources, Desert Research Center, Matareya, Cairo, Egypt

² Genetics and Cytology Unit, Department of Genetic Resources, Desert Research Center, Matareya, Cairo, Egypt

10.21608/ejdr.2022.101746.1088

Abstract

Smooth cayenne pineapple cultivar is considered the most suitable variety for the climatic conditions in Egypt, in addition to its distinctive flavor and ability for canning. To meet market demand, large quantities of plant materials are required, which cannot be obtained viatraditional breeding methods. As a result, an in vitrotechnique was designed to increase the multiplication rate, rooting, and acclimatization of this unique pineapple variety. Thidiazuron (TDZ) at 2.0 mg/l proved to be superior for direct organogenesis rate. Half strength Murashige and Skoog (MS) medium containing 1.0 mg/l indole-3-butyric acid (IBA) in combination with 0.5 mg/l naphthalene acetic acid (NAA) improved the numberand length of roots. Organogenesis has been accelerated from in vitroderived leaves and developed to healthy plantlets, which were acclimatized in the greenhouse. In order to investigate the effect of micropropagation on circadian rhythm, the circadian expression of Aco013229.1 was compared, which belongs to the MADS-box gene family, between the in vitro propagated plantlets and the in vivo-grown plants. The unaffected expression pattern of Aco013229.1 proposed that in vitro micropropagation did not affect the circadian cycling; hence, the CAM photosynthesis process was not interrupted. Moreover, the circadian expression of Aco013229.1 of the in vitroand in vivo-grown plants showed a similar pattern, strongly pointing at a stable circadian rhythm of the micropropagated plants and thus a well-maintained CAM photosynthesis. This gene family plays a significant role in a number of biological processes especially flowering.

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