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Type of Okra (Abelmoschus)And Its Nature of Resistance to Yellow Vein Mosaic Virus Disease

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Type of Okra (Abelmoschus)And Its Nature of Resistance to Yellow Vein Mosaic Virus Disease Cytologia 51: 753-756, 1986 Origin of 'Guineen' Type of Okra (Abelmoschus)and its Nature of Resistance to Yellow Vein Mosaic Virus Disease K. J. Madhusoodanan and M. A. Nazeer Indian Cardamom ResearchInstitute, Kailasanadu-685553, Kerala, India and Rubber Research Institute of India, Kottayam-686009, Kerala, India AcceptedJuly 27, 1985 The tender green fruit of okra (Abelmoschus esculentus) is prominent among the warmer region vegetables. In India, the high suceptibility of the plant to yellow vein mosaic disease spread by an insect vector Bemisia tabaci Genn. leads at times to a loss of about 94% of the crop (Shastry and Singh 1974), besides the fruit is also attacked by borer (Earias insulana). Hybridization with a 'Guineen' type of okra, an yellow vein mosaic resistant and pest immune species, followed by back-crossing and selection has already been taken up to incorporate the disease resistant genes while tenabling the palatability of A. esculentus fruit. For the success of such a rational crossing programme, a thorough understanding of the cytogenetic relation ships between the two types would be an indispensable prerequisite. It is also im portant from the phylogenetic stand-point. Materials and methods The 'Guineen' type (Fig. 1) used in the present study is an accession of okra introduced by the Division of Plant Introduction, I.A. R.I., New Delhi from Ghana which was initially considered as Abelmoschusmanihot but not confirmedas it closely resembles A. esculentusas well. The other one-'Soudanien' type (A. esculentus(L.) Moench; Fig. 2) is a race cultivated locally. The type names are as proposed by Siemonsma (1982). Both the types and their reciprocal hybrids were grown under uniform condi tions in the experimental plot. Meiotic studies were carried out by fixing the young fl ower buds in 1: 3 acetic alcohol mordanted with ferric acetate and squashed in 1% acetocarmine. Results The two types are highly compatible as all the crosses attempted were successful ensuing in good seed set. The F1 hybrids (Fig. 3) obstained reciprocally were in distinguishable from each other. Largely, the morphological characters of the hy brid were intermediate between those of the parents. But, they showed a prono unced vegetative vigor and increase in yield. Irrespective of open-pollination, selfing 754 K. J. Madhusoodanan and M. A. Nazeer Cytologia 51 or back-crossing the hybrid plants had a high fruit set. However, its pods were intermediate in size as well as in shape and contained only 2 to 3 seeds each (Fig. 4), while a few were seedless. Although a lot of seeds could be obtained, most of them were lustreless and deformed, presumably due to abortion of embyo, and were inviable. From the seedlings obtained, amphiploids were raised anticipating more fertilie forms. But it was of no practical value because of their gnarled vegetative parts. Figs. 1-6. 1-3, 'Guineen' type, 'Soudanien' type and its F, hybrid respectively. (Scale depicts 40cm. in 1st and 3rd while 25cm. in the 2nd.). 4, longitudinal as well as cross section of pod of A. esculentus (Left), F1 hybrid (middle) and 'Guineen' type. (right). 5, metaphase I, 6511+331 (F, hybrid of A. esculentus•~ 'Guineen' type). 6, polyad formation in the hybrid. At meiotic metaphase I while A. esculentus had 65 II, in the 'Guineen' type 9811 were discernible. The F, hybrid has 2n=163 chromosomes which showed atypical association of 65 bivalents and 33 univalents at meiotic metaphase I (Fig. 5). An aphase separation was invariably highly irregular and was conspicuous in having a number of laggards. Most of the cells formed polyads (Fig. 6) resulting in sterile pollen grains which considerably varied in size and staining property. None of the F1 plants at its juvenile stage exhibited any symptom of yellow vein mosaic disease. However, out of 25 plants grown to maturity 2 were infected by the virus at a later stage and in the succeeding generations more than half of the population was severely affected by the disease. Discussion Interspecific crossability is significant from the evolutionary and systematic stand 1986 'Guineen' type of Okra and Resistance to Virus Disease 755 point since it throws light on the phylogeny, or at least indicates the affinity existing between the species involved. From the crossing data it is apparent that there is no barrier to successful intercrossing between A. esculentus and the 'Guineen' type since none of the crosses failed to give hybrid seed. Unlike some earlier reports (Teshima 1933, Thakur 1976) in the present case as observed by Siemonsma (1982) the hybrids could be readily obtained reciprocally with no discrepancy regarding the direction of cross. Though several sources of resistance to yellow vein mosaic virus have been identified (Prem Nath 1970), an accentuated attention of okra breeders has been received by the 'Guineen' type since its introduction to India. It is irrefutably proved that both the introduced type and its hybrid with A. esculentus are symptom less carriers of the disease with some inbuilt genetic mechanism which did not allow multiplication of the virus fast enough to show up (Thakur 1976, Singh and Thakur 1979). So, it can be postulated that even if a disease resistant strain develops, there is high probability for it to loose this property due to some genetic and agroclimatic factors as it happened with 'Pusa Swami' (an A. esculentus variety reported earlier to be a symptomlesss carrier of the virus; vide Singh and Thakur 1979). The difference in chromosome number of the types which resulted in the for mation of as many as 31 to 35 univalents per cell in the hybrid disrupts the normal meiotic process and thereby virtually upsets its sexual mechanism. The ensuing high sterility of the F, and succeeding generation hybrids form the chief set back to any intended programme of transferring the genes responsible for disease and pest resistance to the high yielding cultivated varieties of okra, From the phylogenetic point of view the meiotic behaviour of the present hy brid is intriguing. The 'Drosera Scheme' of chromosome pairing in reciprocal hy brids indicates that the haploid complement contributed by A. esculentus is com pletely homologous with 65 chromosomes of the 'Guineen' type while the remaining 33 chromosomes which regularly appear as univalents showing nonhomology with A. esculentus complement. The latter genome may be related to A. manihot L. Medik (syn. H. manihot L.) with n=33 reported by Skovsted (1935) or with some other hitherto unidentified species with the same chromosome number (see Ford 1938). Thus, the 'Guineen' type appears to be an amphiploid comprising one genome of cultivated okra (A. esculentus) and the other belongs to some species with 33 gametic chromosomes. Crossability relations and meiotic behaviour of F, hybrid reported by Kuwada (1957) of the aforementioned two species may refer to a different cross because of difference in number of chromosomes of the parents as well as the dissimilar meiotic behaviour of its hybrid as compared to the present one. On the basis of phytogeographical studies Vavilov (1949-50) has suggested an Abyssinian origin for A. esculentus. Its wild form is reported from Sudan and a natural amphiploid has now come across from Ghana. The species is polyphyletic in origin, and Joshi and Hardas (1956) have pointed to its alloploid nature. Ac cording to them, the basic chromosome number of the genus is uncertain and the haploid numbers n=29 and 36 must themselves be polyploid. The present investi gation too conforms to the above contention. 756 K. J. Madhusoodanan and M. A. Nazeer Cytologia 51 Summary Successful intercrossing has been carried out between a 'Soudanien' and a 'Guineen' type of okra , of which the latter is reported to be immune to the yellow vein mosaic (YVM) virus disease. However, due to difference in chromosome numbers of the parents the hybrid exhibited abnormal meiosis leading to sterility and thereby hinders fruitful incrorporation of the disease resistant gene to the former. Phylogenetic relationship between them is discussed. Origin of 'Guineen' type through natural hybridization between A. esculentsus and A. manihot is suggested. Acknowledgements The authors thank Dr. T. N. Khoshoo, Ex-Director, National Botanical Re search Institute, Lucknow for encouragement and facilities, Dr. M. Pal for the material, Dr. D. Ohri for perusing the manuscript and Mr. T. K. Sharma for the illustrations. References Ford, C. E. 1938. A contribution to a cytogenetical survey of the Malvaceae. Genetica 20: 431 - 453. Joshi, A. B. and Hardas, M. W. 1956. Alloploid nature of okra, Abelmoschus esculentus (L.) Moench. Nature 178: 1190. Kuwada, H. 1957. Crossability in direct and reciprocal crosses between Hibiscus esculentus and H. manihot, and the morphology and meiosis in the Fl. Jap. J. Breed. 7: 93-102. Pal, B. P., Singh, H. B. and Swarup, V. 1952. Taxonomic relationship and breeding possibilities of species of Abelmoschus related to okra (A. esculentus). Bot. Gaz. 113: 456-464. Prem Nath. 1970. Problem oriented breeding projects in vegetable crops. Sabrao News 1. Mishima 2: 123-134. Shastry, K. S. M. and Singh, S. J. 1974. Effect of yellow vein mosaic virus infection on growth and yield of okra crop. Indian Phytopath. 27: 294-297. Siemonsma, J. S. 1982. West African okra-morphological and cytogenetical indications for the existence of a natural amphidiploid of Abelmoschus esculentus (L.) Moench and A. manihot (L.) Medicus. Euphytica 31: 241-252. Singh, M. and Thakur, M. R. 1979. Nature of resistance to yellow vein mosaic in Abelmoschus manihot ssp. manihot. Curr. Sci. 48: 164-165. Skovsted, A. 1935. Chromosome numbers in the Malvaceae I. Jour. Genet. 31: 236-296. Teshima, T. 1933. Genetical and cytological studies in an interspecific hybrid of H. esculentus L. and H.
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