M. Paramathma

Tamil Nadu Agricultural University

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K. T. Parthiban

Tamil Nadu Agricultural University

R. Sudhagar

Tamil Nadu Agricultural University

P. Srimathi

Tamil Nadu Agricultural University

C. Surendran

Tamil Nadu Agricultural University

P. Masilamani

Tamil Nadu Agricultural University

N. Gurunathan

Rajiv Gandhi University of Health Sciences

R. Sasikala

National College, Trichy

P. S. Devanand

Tamil Nadu Agricultural University

V. Subbulakshmi

Central Arid Zone Research Institute

P. Krishnan

Indian Agricultural Research Institute

Cooperative Institutions

Tamil Nadu Agricultural University

Forest Research Institute

Indian Council of Agricultural Research

Institute of Forest Genetics and Tree Breeding

Annamalai University

Planta

Vellore Institute of Technology University

Indian Institute of Oilseeds Research

Indian Agricultural Research Institute

Indian Institute of Soil and Water Conservation

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Clonal evaluation of Casuarina equisetifolia L. Johnson.

Ashok Kumar M. Paramathma M. D. Savio Vivek Acharya K. S. Verma

Casuarina equisetifolia

Casuarina

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First report of Lasiodiplodia theobromae (Pat.) Griffon & Maubl causing root rot and collar rot disease of physic nut (Jatropha curcas L.) in India

Australasian Plant Disease Notes (2009)

P. Latha V. Prakasam A. Kamalakannan C. Gopalakrishnan T. Raguchander

Lasiodiplodia theobromae

Collar rot

Jatropha curcas

Root rot

Dry rot

10.1071/dn09008

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Citations (22)

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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Ploidy Level and Basic Chromosome Number in Some Species of Jatropha L.

R. Sasikala M. Paramathma

The young developing inflorescence of ten species of the genus Jatropha and one interspecific hybrid between Jatropha curcas × Jatropha integerrima were fixed in Carnoy's fluid. Pollen mother cells were well stained with 2% acetocarmine. Eight species and one hybrid (J.curcas × J.integerrima) exhibited 11 bivalents and 2n =22 and x=11. But the other two species, J.villosa var. villosaand and J.villosa var. ramnadensis showed only 10 bivalents and 2n number of 20 chromosomes and x=10. The study concluded the occurrence of two kinds of haploid chromosome numbers of n =10 and n =11. Except Jatropha tanjorensis, cytological investigation in all species exhibited normal and complete pairing and bivalent formation in metaphase I with equal separation of chromosomes in anaphase indicating that the course of meiosis was normal. Jatropha tanjorensis did not exhibit normal course of meiosis and no proper count of chromosomes could be made. The present investigation revealed the existence of two basic chromosome numbers x = 5 and x = 6 in the genus Jatropha.

Jatropha

Jatropha curcas

Bivalent (engine)

Chromosome number

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Genetic diversity of Indian Jatropha species as revealed by morphological and ISSR markers

Journal of Crop Science and Biotechnology (2009)

V. Vijayanand N. Senthil S. Vellaikumar M. Paramathma

Jatropha curcas

10.1007/s12892-009-0081-0

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The Ramiah gene bank: a step-forward in agro-biodiversity conservation at TNAU.

Madras Agricultural Journal (2011)

A. J. Joel Sewa Ram K. Thiyagarajan M. Paramathma P. Murugesa Boopathi

Gene bank

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Citations (1)

Allelopathic compounds in Vitex negundo

Journal of Non Timber Forest Products (2002)

K. Sasikumar M. Paramathma K. T. Parthiban

Investigations carried out to identify the allelopathic compounds in the leaf leachates of Vitex negundo using paper and gas chromatography revealed the presence of r-coumaric, r-hydroxybenzoic, ferulic, vanillic and syringic acids besides catechol. The allelopathic influence of leachate was tested by petriplate bioassay and crops of blackgram, cowpea, greengram, horsegram and pigeonpea in pot culture under nursery conditions. Crop growth, root length, shoot length, nodule dry weight and nitrogenase activity were depressed in all test crops. Maximum reductions in growth, root length and shoot length were obtained with cowpea; nodule dry weight with greengram and nitrogenase activity with horsegram.

Allelopathy

Vitex negundo

Dry weight

10.54207/bsmps2000-2002-935096

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Studies on heterosis in six Eucalyptus species.

JOURNAL OF TROPICAL FOREST SCIENCE (1997)

M. Paramathma C. Surendran R. S. V.

PARAMATHMA, M., SURENDRAN, C. & VINAYA RAI, R.S. 1997. Studies on heterosis in six Eucalyptus species. Six species of Eucalyptus^ iz. E. alba, E. camaldulensis, E. microtheca, E. tereticornis, E. polycarpa and E. torelliana were subjected to a complete diallel mating. The cross between E. polycarpa and E. torelliana was characterised by post-fertilisation abortion. An evaluation of the remaining four parents and their 12 hybrids for heterosis among parents revealed E. alba and E. tereticornis to record higher than mean performance. Among the hybrids, those of E. alba x E. tereticornis registered highest heterosis for most characters.

Eucalyptus tereticornis

Mating design

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Effect of organic seed pelleting on seed storability and quality seedling production in biofuel tree species

Journal of Horticulture and Forestry (2013)

P. Srimathi N. Mariappan L. Sundaramoorthy M. Paramathma

Jatropha curcas and Pongamia pinnata are the promising biofuel species worldwide that contained 35 to 45% seed oil, respectively. Due to the reason of high oil content of these seeds are liable to getting easily deteriorated by fungal and insects during storage and that could hold the limitation of spreading through afforestation. To resolve this problem, the present study was carried out with J. curcas and P. pinnata seeds pelleted with leaf powders of Azadirachta indica, P. pinnata and Adhatoda vasica in order to study the effects of botanical pelleting storability and production of quality seedlings at nursery. This experiment was conducted at Department of Seed Science and Technology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, India during 2009 to 2010. The results revealed that J. curcas and P. pinnata seeds pelleted with pungam and neem leaf powder showed the maximum germination percentage and growth characters at nursery, respectively. From the study, it was also observed thatJatropha seeds pelleted with pungam leaf powder recorded 169% higher germination and P. pinnata seeds pelleted with A. indica leaf powder registered 92% higher germination than control after 9 months of storage. We conclude from this study that, botanical leaf powder seed pelleting not only improve the longevity of seeds through protecting the seeds from fungal and insect attack but also improve the seed and soil relationships through enriching the rhizosphere region of seed to produce better growth and development. Key words: Jatropha, pungam, leaf powder pelleting, seed storage, growth, development.

Pongamia

Jatropha curcas

Azadirachta

Jatropha

10.5897/jhf2013.0307

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Citations (8)

Genetic interactions in Eucalyptus species

Journal of Innovative Agriculture (2020)

M. Paramathma

Paramathma M.2020.Genetic interactions in Eucalyptus species.Journal of Innovative Agriculture.volume 7, issue 4, Pages 7-10. Six species of Eucalyptus viz., E. alba, E. camaldulensis, E. microtheca, E. tereticornis, E. polycarpa and E. torelliana, were subjected to full diallel mating. The cross between E. polycarpa and E. torelliana was characterised by post-fertilization abortion. An evaluation of the remaining four parents and 12 hybrids revealed that characters like height, DBH, leaf number and leaf breadth were free from epistatic interaction. For characters like internode length and leaf length, non-allelic interaction was manifest. The magnitude of dominant genes was high for most characters indicating the promise of heterosis breeding for these traits. Symmetrical distribution of positive and negative genes was inferred. The number of genes that control the characters was one for collar diameter and leaf length, two for height and internode length and three for leaf breadth. Narrow sense heritability was high for all the attributes, barring internode length.

Epistasis

Mating design

10.37446/jinagri/rsa/7.4.2020.7-10

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