Molecular Plant Breeding in Tomatoes

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: closed (31 July 2021) | Viewed by 6267

Special Issue Editor


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Guest Editor
Instituto de Biología Molecular y Celular de Plantas, Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Ingeniero Fausto Elio s/n. 46022 Valencia, Spain
Interests: plant breeding; agronomy; marker-assisted selection; molecular plant breeding; plant genetics; quantitative trait loci

Special Issue Information

Dear Colleagues,

Tomato is one of the most important species in the world, being widely cultivated and with great economic importance. The production of 182 million tons in 2018 represents a doubling in the last 20 years. The selection process carried out on tomatoes to increase their agronomic value has led to a reduction in genetic diversity in the cultivated varieties. Fortunately, tomato is rich in genetic resources, and breeding programs to address the problems that affect it are being carried out extensively. Furthermore, the tomato is also an important model system for plants and, especially, for the biology of the fleshy fruit.

Over the years, the goals of genetic breeding of tomatoes have targeted specific traits such as productivity, domestication, fruit quality, tolerance to pests and diseases, evolution, etc. Nowadays, it is additionally necessary to take into account the changing conditions due to climate change, with new challenges in adapting to new environmental conditions and to face new emerging diseases. All this has expanded the objectives of tomato improvement programs.

For this reason, the proposed Special Issue on “Molecular Plant Breeding in Tomatoes” aims to present advances in tomato breeding traditional and new objectives that involve facing the new global climatic conditions. I look forward to receiving your manuscripts and am eager to share your results with the research community.

Dr. María José Gonzalo Pascual
Guest Editor

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Keywords

  • Tomato breeding
  • Molecular breeding
  • Fruit quality
  • Domestication and evolution
  • Biotic stresses
  • Abiotic stresses

Published Papers (1 paper)

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Research

18 pages, 4616 KiB  
Article
Genetic Diversity Analysis of Tomato (Solanum lycopersicum L.) with Morphological, Cytological, and Molecular Markers under Heat Stress
by Ahmed B. EL-Mansy, Diaa Abd El-Moneim, Salha Mesfer ALshamrani, Fatmah Ahmed Safhi, Mohamed A. Abdein and Amira A. Ibrahim
Horticulturae 2021, 7(4), 65; https://doi.org/10.3390/horticulturae7040065 - 26 Mar 2021
Cited by 22 | Viewed by 5731
Abstract
Tomatoes are usually consumed daily in the human diet. High temperatures reduce the number of tomato yields per year. Heat stress has been considered one of the most prominent causes of alterations in morphological and molecular characteristics in crops that decrease normal growth, [...] Read more.
Tomatoes are usually consumed daily in the human diet. High temperatures reduce the number of tomato yields per year. Heat stress has been considered one of the most prominent causes of alterations in morphological and molecular characteristics in crops that decrease normal growth, production, and yield in diverse plants, including tomatoes (Solanum lycopersicum L.). In this study, we evaluated six tomato lines, namely G1, G2, G3, G4, G5, and G6, at morphological, molecular, and cytological levels under heat stress. The average results of two seasons (2018 and 2019) clarified that the G6, G1, and G2 lines recorded the highest flowering values, as well as some fruit and vegetative growth traits. Furthermore, G6 and G2 had the maximum number of fruits/plant, whereas G2 and G1 produced the highest yield/plant under high temperatures. The number of chromosomes in all lines was 2n = 24, except for G5, in which the number was 2n = 26, whereas chromosome sizes were small, ranging from 323.08 to 464.48 µm. The G1 cultivar was a symmetrical cultivar (primitive), having the highest total form percentage (TF%) and symmetry index (Syi) values and the minimum karyotype asymmetry index (ASK) value, whereas G4 was asymmetrical (advanced). Molecular marker analysis demonstrated that intersimple sequence repeat (ISSR) primers 49A, HB-14, 49A, 49B, and 89B presented the highest values for polymorphism percentage P%, marker index (MI), effective multiplex ratio (EMR), and polymorphism information content (PIC), respectively. In contrast, OP-A3, OP-B3, SCoT 2, and SCoT 12 primers showed the highest PIC, EMR, MI, P%, and resolving power (Rp) values across the studied random amplified polymorphic DNA (RAPD) and start codon-targeted (SCoT) primers. Moreover, ISSR revealed the highest number of unique specific markers (6), followed by RAPD (4) and SCoT (3) markers. Cluster analysis of combined cytological data and data relating to molecular marker attributes separated the G1, G2, and G3 lines into one group, whereas the other lines were clustered in another group. On the whole, the application of combined analysis using morphological, cytological, and molecular genetics techniques could be considered to provide suitable parameters for studying the evolution of the genetic divergence between the studied tomato lines. Full article
(This article belongs to the Special Issue Molecular Plant Breeding in Tomatoes)
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