K. Thiyagarajan

Borlaug Institute for South Asia

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Co-Authors

S. Manonmani

Tamil Nadu Agricultural University

Prashant Vikram

Shree Guru Gobind Singh Tricentenary University

Patrizia Galeffi

National Agency for New Technologies, Energy and Sustainable Economic Development

Cristina Cantale

National Agency for New Technologies, Energy and Sustainable Economic Development

R. Rabindran

Tamil Nadu Agricultural University

Velu Govindan

Centro Internacional de Mejoramiento de Maíz Y Trigo

Arianna Latini

National Agency for New Technologies, Energy and Sustainable Economic Development

S. Robin

Tamil Nadu Agricultural University

K. Amudha

R.M.D. Engineering College

T. S. Raveendran

Tamil Nadu Agricultural University

Cooperative Institutions

Tamil Nadu Agricultural University

Centro Internacional de Mejoramiento de Maíz Y Trigo

Indian Council of Agricultural Research

National Agency for New Technologies, Energy and Sustainable Economic Development

International Rice Research Institute

Indian Agricultural Research Institute

Indian Institute of Rice Research

Annamalai University

Bharath University

National Bureau of Plant Genetic Resources

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STUDIES ON CHARACTER ASSOCIATION AND PATH CO-EFFICIENT ANALYSIS IN COWPEA (Vigna unguiculata (L.) Walp.)

Madras Agricultural Journal (1989)

K. Thiyagarajan S. Rajasekaran

Seed yield in cowpea exhibited significant and positive association with days to maturity, plant height, number of branches, clusters and pods per plant, pod length and seeds per pod. However, days to 50 per cent flowering and 100 grain weight exhibited negative association with yield. The path analysis revealed that number of primary branches per plant, days to 50 per cent flowering and pods per plant had high positive direct effect on seed yield.

Path coefficient

10.29321/maj.10.a02021

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Physiological characterization of heat tolerant hybrids in rice (Oryza sativa L.).

ROMANIAN BIOTECHNOLOGICAL LETTERS (2018)

Doddabhimappa R. Gangapur K. Thiyagarajan Santoshkumar Magadum C. Vijaylakshmi

Oryza

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The Ramiah Gene Bank : A Step-Forward in Agro-Biodiversity Conservation at TNAU

Madras Agricultural Journal (2011)

JOHN JOEL A GANESH RAM S K. Thiyagarajan M. Paramathma MURUGESA BOOPATHI P

India is one of the richest countries for plant diversity with approximately 16,000 vascular plants, 5000 endemic species and 140 endemic genera. However, an estimated 3000-4000 plant species are being threatened to be on the verge of extinction, fixing India, one of the highest priorities for plant biodiversity conservation. In recent decades, India has increasingly recognized the importance of plant diversity in efforts to conserve and sustainably use its plant diversity. Conservation requires a sound scientific and technical basis and there are two methods viz., ex situ and in situ conservation which are equally important and should be regarded as complementary. In the process of ex situ conservation, the National Bureau of Plant Genetic Resources (NBPGR) possess 3,85,645 germplasm accessions of various agri- horticultural crops. Realising the need of ago biodiversity conservation, TNAU has created a gene bank facility named after the legendary rice breeder Dr. K. Ramiah, with the capacity to conserve more than 1,00,000 germplasm accession under medium term storage (MTS) and long term storage (LTS) conditions. Presently a total of 13,567 accessions of more than 21 species are deposited in the gene bank. These provide an important reserve of plant resources for sustainable economic and social development. Thus, TNAU's strategic and vision for conservation of plant diversity and sustainable use of plant resources in the 21 st century is of far-reaching significance for sustainable development of our economy and society.

Germ plasm

In situ conservation

Ex situ conservation

Genetic Resources

Accession

Plant Diversity

10.29321/maj.10.100228

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Factors influencing Agrobacterium-mediated genetic transformation efficiency in bread wheat (Triticum aestivum L.)

Indian Journal of Genetics and Plant Breeding (The) (2024)

K. Thiyagarajan Luis Miguel Noguera Mario Pacheco Velu Govindan Prashant Vikram

Assessment of the efficiency of Agrobacterium tumefaciens mediated transformation in four bread wheat varieties was focused and upon optimization of experiments done to obtain tangible results. The four varieties, Fielder, Navojoa, Baj and Kachu/saul, were transformed with optimized protocols and randomly selected from a selection medium amalgamated with phosphinothricin (Glufosinate). Initially, the variety Fielder has proceeded with 36 different concentrations of synthetic auxins 2,4-D and picloram as 36 treatments. The treatment 30 (48 μg of 2,4-D and 64 μg of picloram) has shown higher efficiency and is comparable in terms of the three traits studied. Additionally, antioxidants and growth regulators were adjusted to obtain better results towards reasonable transformation frequency. Additional varieties were also tested and selected against the selectable marker PPT based on the optimization for the variety Fielder. Selected genotypes were subjected for gusA or Bar gene PCR amplification. The result revealed the frequency of transgenesis in the range of 60 to 70% with the varieties studied. However, the whole experiment needs further repetitions for confirmatory results. Transgenic genotypes of the Fielder variety showed moderate to strong GUS expression in leaves, anthers, seeds, seed coats, and roots compared to non-transgenic control plant tissues. PPT leaf painting assay showed the lack of necrosis on the painted area of leaves in transgenic genotypes compared to the non-transgenic ones.

Glufosinate

Picloram

Transformation efficiency

10.31742/isgpb.84.1.5

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A High Yielding Dual Purpose Hybrid Sorghum CO 5 for Tamil Nadu

Madras Agricultural Journal (2012)

K Ganesamurthy D. Punitha S. D. Sivakumar P. Jayaprakash P. Veerabadhiran

A dual purpose sorghum hybrid TNSH 482 derived from the cross ICSA 51 x TNS 30, evolved with an objective to develop high yielding dual purpose hybrid with improved grain and stover yield besides resistant to shootfly and grain mould was released as TNAU sorghum hybrid CO 5. It is a medium tall, non-lodging and tan plant type hybrid which matures in 95 - 100 days and remains green even at maturity. The grains are creamy white in colour, borne on medium cylindrical and semi-loose ear heads. It recorded an average grain yield of 2769 Kg/ ha under rainfed which was 13.16 and 17.03 per cent increase over the checks, COH 4 and MSH 51 respectively while its mean grain yield was 4338 Kg/ha under irrigation which was 17.18 and 13.32 per cent increase over the checks, COH 4 and MSH 51 respectively. The mean stover yield was 7563 and 10548 Kg/ha under rainfed and irrigated situations respectively. The hybrid TNSH 482 is resistant to downy mildew and moderately resistant to shoot fly and grain mould disease.

Stover

Dual purpose

10.29321/maj.10.100109

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Fertility restoration behaviour of promising CMS lines in rice (Oryza sativa L.)

Indian Journal of Agricultural Research (2003)

D. Malarvizhi K. Thiyagarajan S. Manonmani P. Deepa Sankar

About 291, short, medium, long duration indica cultivars, japonica and IRRI restorers were crossed with six CMS lines derived from wild abortive cytoplasm viz., IR 58025 A, IR 68888A, IR 68897 A, IR 68281 A, IR 69616 A, PMS 3 A, to identify effective restorers and potential maintainers. Based on pollen/spikelet fertility, 30.4 per cent of the male parents were identified as effective restorers and 13.7 per cent of the male parents were identified as potential maintainers and the rest were grouped into partial restorers and partial maintainers. Thirteen hybrid combinations were identified as promising based on standard heterosis for yield ranging from 18.5 per cent to 40.0 per cent. The hybrid IR 58025 A/IR 60821-34-1-2 R recorded the highest standard heterosis of 40.0 per cent followed by IR 58025 A/IR 8666-30-3-1-4 R (39.5 per cent), IR 58025 MC 10 R (35.6 per cent), IR 69616 A/IRRI 3054 (29.6 per cent) and IR 68888 MR 4595-54-1 R (28.4 per cent).Indian Journal of Agricultural Research

Cytoplasmic male sterility

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New High Yielding Short Duration Pearl Millet Hybrid: TNAU Cumbu Hybrid CO 9

Madras Agricultural Journal (2012)

P. Sumathi A. R. Muthiah P. Veerabadhiran K. Thiyagarajan T. S. Raveendran

A high yielding and early maturing pearl millet hybrid, TNBH 0642 was developed from a cross between Cytoplasmic male sterile line ICMA93111 and a pollinator line PT 6029-30 at Department of millets, Centre for Plant Breeding and Genetics, Tamil Nadu Agricultural University, Coimbatore-3 during kharif 2005. It has been tested extensively in Tamil Nadu and in other states viz., Karnataka, Andhra Pradesh and Maharashtra, under MLT, ART, OFT and All India Co - ordinated programme for the past five years. The hybrid performed well both under rainfed and irrigated situations in Tamil Nadu. This hybrid is of medium in stature (160 -180 cm) and early in duration (matures in 75-80 days). It produces 4-6 productive tillers with candle shaped earhead. The size of the grain is bold and is greyish yellow in colour. The hybrid TNBH0642 is highly resistant to downy mildew under both normal and sick plot conditions. This new hybrid recorded a mean grain yield of 3728 kg / ha under irrigated conditions, which is about 30 and 24 percent increase over the checks X7 and NH 07 respectively. The mean grain yield under rainfed conditions is 2707 kg /ha which is 18 and 19 per cent increase over X7 and NH07 respectively. The iron content in the grain is high (8 mg / 100 g). It has acceptable cooking quality and has consumer preference due to its flavor, taste and keeping quality of the cooked preparations.

Kharif crop

Grain Quality

Tamil

Pennisetum

10.29321/maj.10.100005

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Genetics, fertility behaviour and molecular marker analysis of a new TGMS line, TS6, in rice

Plant Breeding (2004)

R. Latha K. Thiyagarajan S. Senthilvel

Abstract The thermosensitive genic male sterility (TGMS) system has great potential for revolutionizing hybrid rice production through simple, less expensive and more efficient seed production technology. For the successful utilization of this novel male sterility system, knowledge of the breeding and fertility behaviour of a TGMS line is essential. In this study, the fertility transformation behaviour, the critical fertility and sterility temperatures and the mode of inheritance of male sterility were studied for a new TGMS line, TS6, identified at Tamil Nadu Agricultural University, Coimbatore, India. The pollen and spikelet fertilities recorded on plants raised at fortnightly intervals revealed that this line was completely sterile for 78 consecutive days (35/22 to 32/23°C, maximum/minimum temperatures) and reverted to fertile when the temperature was 30/18°C. It remained fertile continuously for 69 days and the maximum pollen and spikelet fertilities recorded were 75 and 70%, respectively. The fertility was highly influenced by daily maximum temperature followed by average and minimum temperatures. It was not influenced by relative humidity, sunshine hours or photoperiod. The critical temperature inducing sterility and fertility was 26.7 and 25.5°C, respectively. The male sterility in TS6 was inherited as a monogenic recessive in the F 2 and BC 1 populations of TS6 × MRST9 as well as TS6 × IR68281B. Using bulked segregant analysis on an F 2 population of TS6 × MRST9, an RAPD marker, OPC05 2962 , was identified to be associated with TGMS in TS6.

Hybrid seed

10.1111/j.1439-0523.2004.00975.x

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Citations (7)

Identification of genomic regions associated with Ug99 adult plant resistance on wheat (Triticum aestivum L.)

Discover Life (2024)

Prashant Vikram Eric E. López-Vera Sridhar Bhavani K. Thiyagarajan Sukhwinder Singh

Identification

Stem rust

10.1007/s11084-024-09655-4

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Genetic dissection of value-added quality traits and agronomic parameters through genome-wide association mapping in bread wheat (T. aestivum L.)

Frontiers in Plant Science (2024)

Manish K. Vishwakarma Pradeep Kumar Bhati Uttam Kumar Ravi P. Singh Sundeep Kumar

Bread wheat ( T. aestivum) is one of the world’s most widely consumed cereals. Since micronutrient deficiencies are becoming more common among people who primarily depend upon cereal-based diets, a need for better-quality wheat varieties has been felt. An association panel of 154 T. aestivum lines was evaluated for the following quality traits: grain appearance (GA) score, grain hardness (GH), phenol reaction (PR) score, protein percent, sodium dodecyl sulfate (SDS) sedimentation value, and test weight (TWt). In addition, the panel was also phenotyped for grain yield and related traits such as days to heading, days to maturity, plant height, and thousand kernel weight for the year 2017–18 at the Borlaug Institute for South Asia (BISA) Ludhiana and Jabalpur sites. We performed a genome-wide association analysis on this panel using 18,351 genotyping-by-sequencing (GBS) markers to find marker-trait associations for quality and grain yield-related traits. We detected 55 single nucleotide polymorphism (SNP) marker trait associations (MTAs) for quality-related traits on chromosomes 7B (10), 1A (9), 2A (8), 3B (6), 2B (5), 7A (4), and 1B (3), with 3A, 4A, and 6D, having two and the rest, 4B, 5A, 5B, and 1D, having one each. Additionally, 20 SNP MTAs were detected for yield-related traits based on a field experiment conducted in Ludhiana on 7D (4) and 4D (3) chromosomes, while 44 SNP MTAs were reported for Jabalpur on chromosomes 2D (6), 7A (5), 2A (4), and 4A (4). Utilizing these loci in marker-assisted selection will benefit from further validation studies for these loci to improve hexaploid wheat for better yield and grain quality.

Genome-wide Association Study

Genetic Association

Association mapping

Value (mathematics)

10.3389/fpls.2024.1419227

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