Vy H. T. Dang , Giang T. K. Le , Quyen H. M. Le , & Phong V. Nguyen *

* Correspondence: Nguyen Vu Phong (email: nvphong@hcmuaf.edu.vn)

Main Article Content

Abstract

Sweet potato (Ipomoea batatas) is a vital crop used for various purposes, including food, feed, and raw materials. However, its production in Vietnam is being adversely affected by climate change, including changes in rainfall patterns, droughts, and saltwater intrusion. To address these challenges, improving crop diversity is essential to enhance yield, nutritional content, and stress tolerance. This study investigated the effects of 60Co gamma-ray irradiation on shoot regeneration from sweet potato shoot tips and nodal segments, followed by the detection of mutations in newly regenerated shoots. The experimental procedures included optimizing the in vitro culture medium and assessing the impact of varying doses of gamma irradiation on survival, mutation formation, and subsequent recovery across generations. The Murashige and Skoog (MS) medium, supplemented with 2 mg/L 6-benzylaminopurine (BAP) and 0.2 mg/L indole-3-butyric acid (IBA), was found to be optimal for shoot regeneration. Gamma irradiation doses ranging from 0 to 90 Gy were applied. The results showed that the lethal dose 50 (LD50) was 59.3 Gy for nodal segments and 80 Gy for shoot tips. The highest regeneration and survival rates were observed at lower radiation doses (30 Gy), while a 50 Gy irradiation dose resulted in a morphological variation frequency of 8.97%, with the most diversified types of morphological variances. Numerous morphological variances including split leaves, chlorophyll loss, light leaf veins, wavy leaves, stems without apical meristems, and abnormal root proliferation, were observed at different rates after irradiation with 30, 50, or 70 Gy. Genetic analysis using Start Codon Targeted (SCoT) markers confirmed genetic differences between the variants and the mother plant, indicating the effectiveness of this approach in enhancing genetic diversity.

Keywords: Gamma Irradiation, Morphological Variation, Mutagenesis, SCoT, Sweet potato

Article Details

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