본 연구는 저광 조사 저온 저장 중 광합성유효방사(PAR)내의 각 파장이 토마토 묘의 형태와 엽색 변화에 미치는 영향을 조사하기 위하여 실시되었다. 10±0.5℃의 온도와 피크 파장이 각각 405, 450, 505, 545, 600, 645, 680, 700nm의 발광다이오드로부터 조사된 3μmol m-2s-1의 광합성유효광량 자속밀도 조건에서 토마토 접목묘를 28일간 저장하였다. 405, 450, 505nm의 파장에서 저장된 묘의 잎은 다른 파장에서 저장된 잎에 비해 직립하는 경향을 보였으며, 특히 450과 505nm 파장에서 저장된 묘의 경우 엽축 생장이 억제되면서 콤팩트한 형태를 보였다. 파장의 변화에 따른 엽색의 규칙적인 변화는 저장 전후를 비교하여 관찰되지 않았으나, 405와 700nm 파장에서 저장된 묘는 엷은 녹색을 나타내었다. 저광 조사 저온 저장 중, 450~545nm 영역의 광조사는 토마토 묘의 직립을 유도하여 외관상 건강한 묘로 인정 받는데 기여할 것으로 기대된다.

The relationship between source leaf position and photo-assimilate translocation and distribution was characterized for tomato (Lycopersicon esculentum Mill) grown in the greenhouse. Three different positions of source leaf on the stem (first node above or below the first fruit cluster and 5th node above the first fruit cluster) were tested for their influence on 14CO2 assimilation and transfer to different parts of the plant. The leaves at the 5th node above the first fruit cluster transferred the highest (57%) proportion of C14 to other plant parts, followed by leaves home on the first node below the first fruit cluster (50%), and the first node above the first fruit cluster (39%). In all treatments, fruits served as the strongest sink for C14, followed by stem, leaf, and root tissues. The leaf home on the 5th node above the first fruit cluster transferred the largest amount of C14 to the second fruit cluster.

오이와 토마토의 발아에 미치는 전작물 잔유물(양배추, 무, 파, 상추)의 효과를 포트에서 시험하였다. 그결과 파가 발아를 가장 억제 시켰으며 무, 앙배추, 상추의 순이었다. 다만 오이의 경우 상추는 발아를 억제시키지 않았다. 채소잔유물의 오이, 토마토의 발아억제는 약 20일간 지속되었고 그 후에는 오히려 생육을 촉진시켰다. 촉진은 억제의 반대 순서로 파, 무, 양배추, 상추의 순이었다. 양배추, 무, 파, 상추의 추출물을 5, 10, 17, 23, 35, 50, 65%로 희석하여 오이와 토마토의 발아와 유근 신장에 미치는 시험을 실시한 바 저농도인 5, 10, 17, 23%에서는 모든 처리가 오이의 발아를 억제하지 않았다. 상추의 35, 50, 65% 처리구에서는 오이 발아가 이루어지지 않았다. 잎파는 65% 치리구에서만 오이의 발아억제현상이 보였다. 오이의 유근 신장은 다만 잎파의 경우에 저농도인 17, 23%에서 억제적이었다. 고농도에서는 양배추, 무 추출액 35% 제외하고는 모두 오이의 유근 신장을 억제하였다. 토마토는 저농도에서는 상추만 제외하고 억제현상이 없었으나 고농도인 35, 50, 65%에서는 발아억제 현상이 뚜렷하였다. 50%이상 구에서는 오이와 달리 전혀 발아가되지 않았다. 유관의 신장은토마토의 경우 파와 상추 추출물이 23%이상에서는 강하게 억제하였다. 이상의 결과로 미루어 채소류의 추출물도 오이보다 토마토의 발아 억제를 심하게 하고 고농도에서는 유근의 신장을 억제하였다.

Cherry tomato ‘TY Candy’ F₁ Hybrid was bred in Tomato Life Science and Research Institute from 2008 to 2014, which has indeterminate plant type, oblong fruit shape, average fruit weight 17 ~ 22 g and sugar content brix 8 ~ 9. Female line was selected and fixed with vigorous plant, firm fruit texture, Fusarium and Cladosporium resistance. Male line was selected and fixed with medium internode, deep leaf color, high brix, Yellow leaf curl virus and Nematode resistance. F₁ combination was made and pollinated in 2011 year, hybrid selection and sample seed production were progressed in 2012 year, farmers’ field trial was conducted at major tomato cultivation area and resulted good performance in 2013 ~ 2014. The distinctive characteristics of ‘TY Candy’ are higher yield, fruit quality and TYLCV, Nematode, Cladosporium etc. multi-disease resistance compared to existed varieties.

Leaf mold disease in tomato (Solanum lycopersicum) is caused by Cladosporium fulvum, a fungal leaf pathogen. One of effective ways to control leaf mold is to breed disease-resistant tomato cultivars. Cf-4 and Cf-9 resistance (R) genes encode proteins that carry a leucine rich repeat domain and are located in plasma membrane. They trigger hypersensitive response following recognition of corresponding Avr4 and Avr9 proteins of C. fulvum, respectively. Cf-4 and Cf-9 genes are originated from wild tomato species S. habrochaites and S. pimpinellifolium and have been introgressed into commercial tomato cultivars. These two highly homologous orthologs exist as a cluster with four highly homologous paralogs. Due to this reason, development of genetic markers to distinguish these two functional R genes from their orthologs and paralogs is difficult. In this study, we tried to develop single-nucleotide polymorphism (SNP) markers to select tomato cultivars carrying resistant Cf-9 genotype. The genomic sequences of resistant Cf-4 and Cf-9 alleles, susceptible cf-9 alleles, and their paralogs were obtained from the GenBank database, and two functional SNPs causing non-synonymous substitution were found among them. Based on two SNPs, the Cf-9_2-SNP-F/R primer set for high resolution melting (HRM) analysis was developed. HRM analysis with this primer set could successfully distinguish tomato cultivars carrying resistant Cf-9 allele among 30 commercial tomato cultivars, which were characterized with the gene-based marker. These indicate that the SNP marker developed in this study is useful to trace Cf-9 genotype efficiently in marker-assisted selection in tomato.

Tomato yellow leaf curl disease is a devastating disease of tomato (Solanum lycopersicum), which is caused by begomoviruses generally referred to as tomato yellow leaf curl virus (TYLCV). The breeding for TYLCV resistance has been based on the introgression of the Ty-3 resistance locus. Knowledge about the exact location of the Ty-3 on tomato chromosome 6 is needed to understand the genomic organization of the Ty-3 locus. In this study, we conducted a genetic analysis using a segregating population derived from a cross between resistant accession S. lycopersicum “A45” and susceptible accession S. lycopersicum “A39”. The F1 plants showed resistance to TYLCV and F1 was self-pollinated to produce F2 progeny. To screen the TYLCV resistance in 145 F2 plants, a leaf agroinfiltration method was used. F2 plants showed a classical Mendelian seregation (106 resistance : 39 susceptibility) for resistance to TYLCV respectively. SCAR and CAPS markers linked to the Ty-3 were tested for genotyping F2 plants and .genotyping and agroinfiltration results were cosegregated in the newly developed F2 population.

Powdery mildew and leaf mold were major diseases in organic cultured tomatoes. NaHC03 and KH2P04 were selected as control agents for controlling tomato powdery mildew. Control effect of the selected control agents was increased when they were tréated with oil-egg yolk mixtures (OEYO). Also four organic materials used commercially including copper hydroxide and sulfur showed high control effect more than 90% in green house. Also two organic matters, copper hydroxide and sulfur showed high control effect in farmer's field. When tomatoes were cultivated in plastic house installed wìth circulation fan, incidence of powdery mildew and leaf mold was reduced by 56% and 60%, respectively.