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Genetic System in Lathyrus aphaca L.

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Proceedings of the National Academy of Sciences, India Section B: Biological Sciences Aims and scope Submit manuscript

Abstract

Plants of L. aphaca belonging to ten wild populations of JK UT and its adjoining areas (India) were subjected to studies on their genetic system. This involved investigations on breeding and meiotic systems operative in the species. Floral structure and events of floral biology point towards the species being predominantly self-pollinated. However, results of manual pollination treatments show that the species also sets seed through cross pollination. This indicated that the species is both self and cross compatible. Meiotic studies in the male track revealed the presence of 7IIs at diakinesis and metaphase-I and 7:7 segregation at Anaphase-I in all populations. Apart from few abnormalities in the form of quadrivalents and hexavalents, the meiosis in male track was normal. In some pmcs, unusual count of 14IIs and their equal segregation at anaphase-I was also observed. However the percentage of cells exhibiting these irregularities and unusual count was quite low. As such, the species tends to generate variability in small amounts through both meiotic and breeding systems.

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One of the authors is thankful to University of Jammu for providing financial assistance in the form of University Research Scholarship (URS).

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  1. Department of Botany, University of Jammu, Jammu, J&K, 180006, India

    Noopur Sharma & Veenu Kaul

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  1. Noopur Sharma
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Significance Statement: All the plants of all the populations investigated uniformly had 7 perfect bivalents at diakinesis and metaphase-I which segregated normally into 7:7 and 7:7:7:7 at anaphases-I and II, respectively. It, therefore, strongly points towards the species being diploid and quite stable with 2n = 2x = 14. However, few abnormalities in the form of quadrivalents and hexavalents were observed for the first time in this species. Also 14IIs at metaphase-I and their normal segregation into 14:14 at anaphase-I was recorded in some pmcs of L. aphaca. It is quite possible that these pmcs are the source of diploid gametes which may further take part in fertilization and yield tetraploids having 2n = 4x = 28. Uniformity was also observed in the breeding system of this species. Predominant selfing with outcrossing in small installments contribute towards the variability in the gene pool of the germplasm.

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Sharma, N., Kaul, V. Genetic System in Lathyrus aphaca L.. Proc. Natl. Acad. Sci., India, Sect. B Biol. Sci. (2024). https://doi.org/10.1007/s40011-024-01611-6

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