Advances in Germplasm Resources and Genetic Improvement of Tropical Crops

A special issue of Horticulturae (ISSN 2311-7524). This special issue belongs to the section "Genetics, Genomics, Breeding, and Biotechnology (G2B2)".

Deadline for manuscript submissions: 25 January 2025 | Viewed by 1783

Special Issue Editors


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Guest Editor
Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 572829, China
Interests: germplasm resources; breeding; biotechnology

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Guest Editor
College of Tropical Crops, Hainan University, Haikou 570228, China
Interests: coconut molecular breeding; coconut genomics; GWAS
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Special Issue Information

Dear Colleagues,

Tropical crops are important economic crops in more than 100 tropical countries around the world. Tropical horticultural crops, including tropical fruit trees, tropical unique vegetables, and tropical flowers, are important components of tropical crops. Germplasm resources are the genetic source for improving crops. The preservation method of germplasm resources has shifted from in situ preservation to facility preservation (germplasm bank, test-tube seedling bank, ultra-low temperature storage, germplasm nursery, DNA bank). In recent years, the accurate evaluation of collected germplasm resources using molecular biological techniques has become a research hotspot. The identification of phenotypic traits has shifted from single-environment, low-throughput, extensive identification to multi-year, multi-environment, focused traits, high-throughput, and accurate identification. With the rapid development of omics technology, intelligence, and information technology, reliable means have been provided for accurate and rapid exploration and application of important traits, and identification and evaluation have entered a new stage. At the same time, aiming at breeding objectives such as high yield, high quality, disease resistance, insect resistance, and stress resistance, a large number of excellent germplasm have been created through natural or artificial variation, artificial hybridization, seedling selection, induced mutation, distant hybridization, gene editing, and other techniques and methods. These achievements have laid a good foundation for tropical crop breeding. With the advancement of technology, the genetic improvement of tropical crops is shifting from molecular markers, whole genome selection, and transgenosis to multi-omics, big data, genome design, gene editing, synthetic biology, and artificial intelligence.

We welcome the submission of articles from the following areas:

  1. New progress in the preservation of germplasm resources;
  2. New strategies for germplasm resource innovation;
  3. Accurate evaluation of germplasm resources;
  4. New technologies and methods for genetic improvement of germplasm resources;
  5. Cultivation of new varieties.

Prof. Dr. Xintao Lei
Dr. Yong Xiao
Guest Editors

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Keywords

  • tropical horticultural crop
  • germplasm resources
  • new germplasm creation
  • accurate evaluation
  • genetic improvement

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Published Papers (2 papers)

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Research

11 pages, 1616 KiB  
Article
Temporary Immersion Culture: A Potential In Vitro Culture Method for the Clonal Propagation of Coconut
by Zhihua Mu, Zhiying Li, Amirhossein Bazrafshan, Sundaravelpandian Kalaipandian, Eveline Yee Yan Kong, Julianne Biddle, Naga Prafulla Chandrika Nulu and Steve Adkins
Horticulturae 2024, 10(9), 946; https://doi.org/10.3390/horticulturae10090946 - 5 Sep 2024
Viewed by 401
Abstract
As one of the most important members of the palm family, coconut (Cocos nucifera L.) currently faces a substantial gap between demand and production. Current plantings of this crop are aging, and these traditional varieties are susceptible to several devastating pests and [...] Read more.
As one of the most important members of the palm family, coconut (Cocos nucifera L.) currently faces a substantial gap between demand and production. Current plantings of this crop are aging, and these traditional varieties are susceptible to several devastating pests and diseases. Consequently, there is an urgent need to replant and expand coconut lands with new, genetically superior varieties. Such replanting cannot be met through the conventional method of seed nut planting, and tissue culture has emerged as a likely solution to address this problem. However, due to certain technical barriers, elevated costs, and a need for improved efficiency, the development of automated and highly efficient tissue culture techniques is yet to be developed. The present research explores the potential of an in vitro temporary immersion system (TIS) to improve the production of somatic embryogenic callus for plantlet regeneration. Results indicated that, in comparison to the conventional agar-based method used to produce coconut somatic embryogenic callus, the TIS method significantly enhanced embryogenic callus production. The optimal biomass of callus for inoculating the TIS was determined to be 0.2 g in each 900 mL vessel and the most favorable embryogenic developmental stage for employing TIS was the globular stage of embryo development. The most effective immersion time to give the highest yield of embryogenic callus was 5 min every 6 h. This foundational research demonstrates that a TIS step is likely to be important to rapidly produce, on a large scale, coconut plantlets to meet the escalating demand for materials for the replanting of coconut lands. Full article
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15 pages, 3384 KiB  
Article
Analysis of Combining Ability to Obtain Tropical Carrot Hybrids for Production Traits
by Fernanda Gabriela Teixeira Coelho, Gabriel Mascarenhas Maciel, Ana Carolina Silva Siquieroli, Camila Soares de Oliveira, Nádia Nardely Lacerda Durães Parrella, Amilton Ferreira da Silva, José Magno Queiroz Luz and Ana Paula Oliveira Nogueira
Horticulturae 2024, 10(5), 442; https://doi.org/10.3390/horticulturae10050442 - 26 Apr 2024
Viewed by 869
Abstract
Carrots (Daucus carota L.), a globally significant vegetable, lack extensive research on heterotic groups and diallel analysis to generate hybrid combinations. Thus, the objective of this study was to assess combining abilities and identify optimal carrot parents for producing hybrids suitable for [...] Read more.
Carrots (Daucus carota L.), a globally significant vegetable, lack extensive research on heterotic groups and diallel analysis to generate hybrid combinations. Thus, the objective of this study was to assess combining abilities and identify optimal carrot parents for producing hybrids suitable for tropical climates with elevated metabolite levels. Twenty carrot hybrids, ten parent plants, and three commercial cultivars were evaluated during the summers of 2020/2021 and 2021/2022. Agronomic evaluations were carried out and chlorophyll and carotenoid levels were determined, followed by a diallel analysis using Griffing’s Method III and GGE biplot analysis. There were significant general combining ability (GCA) effects for various agronomic traits, suggesting additive genetic effects. Based on GCA, cultivars 5, 4, and 2 were the most promising parents. Specific combining ability (SCA) revealed that hybrids 1 × 2 and 3 × 5 stood out in environment 1, whereas hybrids 1 × 5 and 5 × 3 performed well in environment 2. The GGE biplot analysis showed that hybrids 1 × 2 and 3 × 2 displayed larger average root diameters, belonged to the group with the best bolting percentages, and exhibited stability across environments. Moreover, hybrids 2 × 4, 3 × 1, 4 × 1, and 4 × 2 exhibited higher metabolite levels. These findings suggest the feasibility of obtaining superior hybrids tailored for the tropical carrot market. Full article
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