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Nīlgiri, India

Bhardwaj S.C.,Directorate of Wheat Research | Prashar M.,Directorate of Wheat Research | Kumar S.,Directorate of Wheat Research | Sharma Y.P.,Directorate of Wheat Research | And 2 more authors.
Cereal Research Communications | Year: 2010

Two new pathotypes of Puccinia triticina , 121R60-1 and 377R60-1 the latter virulent on Lr28 , are described for the first time. Both the pathotypes are designated as MHTTS as per North American system of pathotype identification. Pathotype 377R60-1 appears to be the result of a single step mutation for virulence to Lr28 in pathotype 121R60-1. Both pathotypes appear closely related to the most prevalent virulent pathotype 121R63-1(THTTS). The avirulence/virulence profile, resistance sources and their possible relationship with other pathotypes are discussed. Lr28 is now included as one of the differentials for the identification of leaf rust pathotypes. © 2010 Akadémiai Kiadó.

Raina A.P.,National Bureau of Plant Genetic Resources | Negi K.S.,Regional Station
Journal of Herbs, Spices and Medicinal Plants | Year: 2012

The chemical composition of essential oils of two species of Lavendula - Lavendula stoechas and L. angustifolia - from India was investigated by gas chromatography and gas chromatography/mass spectrometry. The essential oil yield from the flowering spikes were 0.86% in L. stoechas and 1.56% in L. angustifolia. Twenty-five components amounting to 96.7% of the oil were identified in L. stoechas, and 31 compounds were identified in L. angustifolia, representing 91.7% of the oil. The major compounds present in the oil of L. stoechas were camphor (52.1%), fenchone (12.0%), 1,8-cineole (9.7%), bornyl acetate (6.2%), camphene (3.3%), α-pinene (1.1%), and terpinen-4-ol (0.6%), and the oil of L. angustifolia exhibited linalool (23.6%), linalyl acetate (35.8%), α-terpinole (6.3%), lavendulyl acetate (4.8%), 1,8-cineole (1.5%), terpinen-4-ol (2.0%), β-caryophyllene (1.8%), camphor (1.4%), and borneol (1.4%). Results showed that the essential oils of these Lavendula sp. were rich in oxygenated monoterpenes ranging from 86.3% in L. stoechas to 82.6% in L. angustifolia and can be exploited for various applications. Copyright © Taylor & Francis Group, LLC.

Bharathi L.K.,Central Horticultural Experiment Station | Munshi A.D.,Indian Agricultural Research Institute | Behera T.K.,Indian Agricultural Research Institute | John K.J.,Regional Station | And 2 more authors.
Indian Journal of Genetics and Plant Breeding | Year: 2013

Analysis of morphological data for determining the genetic variation within seven Momordica species lead to the recognition of three groups. First group containing M. charantia and M. balsamina, was characterized by n = 11, annual, monoecious, non tuberous roots and muricate - tubercled fruit surface. The second group comprised of M. dioica, M. sahyadrica, M. subangulata subsp. renigera and M. cochinchinensis which was characterized by n = 14, perennial, dioecious, tuberous tap roots and echinate-soft papillate fruit surface. The third group contained a single species M. cymbalaria and was characterized by n = 9, perennial, monoecious, tuberous tap roots, and ribbed fruit surface. The species accommodated in group I and II were similar in nature of arils, male flowers, seed surface, symmetrical anthers, ripe fruit colour and nature of epicarp while Group III could be differentiated from other two groups in these characters. The range of intra-specific variation, particularly for fruit and seed characters, was high in all the species studied. At inter-specific level, wide variation was observed for all the quantitative traits studied. Extensive collection, characterization, evaluation for resistance to biotic/abiotic stresses and conservation of species diversity assumes great priority in crop improvement programmes of Momordica.

Bharathi L.K.,Indian Agricultural Research Institute | Vinod,Indian Agricultural Research Institute | Munshi A.D.,Indian Agricultural Research Institute | Behera T.K.,Indian Agricultural Research Institute | And 4 more authors.
Euphytica | Year: 2010

Teasle gourd [Momordica subangulata Blume subsp. renigera (G. Don) de Wilde, 2n = 56] exhibits morphological characters found in both M. dioica (2n = 28) and M. cochinchinensis (2n = 28). Morphological analysis of M. subangulata subsp. renigera suggests an allopolyploid origin. We present evidence elucidating the genomic relationships between M. dioica, M. cochinchinensis and M. subangulata subsp. renigera. A triploid M. dioica × M. subangulata subsp. renigera hybrid had an average of 12.76 bivalents, 13.84 univalents and 0.88 trivalents at metaphase I, while the M. cochinchinensis × M. subangulata subsp. renigera hybrid had an average of 13.08 bivalents, 12.96 univalents and 0.96 trivalents. F1 hybrids of the two diploid species (M. dioica × M. cochinchinensis) showed an average of 9.12 bivalents and 9.76 univalents, suggesting that the genomes of these species are only partially homologous. A higher number of bivalents in the triploid hybrids suggests that M. subangulata subsp. renigera is a segmental allopolyploid of M. dioica and M. cochinchinensis and that its genomes have diverged from the parental genomes. © 2010 Springer Science+Business Media B.V.

Bharathi L.K.,Central Horticultural Experiment Station | Singh H.S.,Central Horticultural Experiment Station | John K.J.,Regional Station
Genetic Resources and Crop Evolution | Year: 2014

A new synthetic species of Momordica (2n = 56) has been developed by crossing natural tetraploid Momordica subangulata subsp. renigera (2n = 56) with induced tetraploid Momordica dioica (2n = 4x = 56). The hybrid produces adventitious root tubers through which it perpetuates and propagates like its female parent and maintains its morphological characteristics in the progeny. The hybrid is naturally fertile and has the superior agronomic traits of both parents making it a good choice as a new vegetable crop. The new species is named Momordica × suboica Bharathi and described. © 2014 Springer Science+Business Media Dordrecht.

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