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Syncytes during male meiosis resulting in 2n pollen grain formationin Lindelofia longiflora ***

Journal of Systematics and Evolution 2011年第5期49卷 406-410页

作者： Vijay Kumar SINGHAL Pawan Kumar RANA Puneet KUMAR Department of Botany Punjabi University

Lindelofia longiflora(Royle ex Benth.) ***(Cl.) Brand(Family:Boraginaceae) is investigated cytologically(n = 12) for the first time from the cold deserts of pangi valley,Chamba District(Himachal Pradesh) in *** report the formation of syncytes and 2n pollen grains in the *** meiosis,the majority of the pollen mother cells(PMCs) exhibited 12 bivalents,equal segregation of chromosomes during anaphases,regular tetrads,and normal-sized pollen grain ***,two proximate PMCs fused during the early stages of prophase-I and resulted in the formation of *** frequency of syncytes in the accession is rather low,at 25 out of 1866(1.33%).Such syncyte PMCs are detectable during meiosis due to their larger size compared to typical *** syncytes or polyploid cells showed normal 24 bivalents and depicted perfectly regular meiotic *** the products of such PMCs yield 2n or larger sized pollen grains that are almost double the size of typical normal or n pollen *** origin of syncytes as a consequence of the fusion of meiocytes during the early stages of meiosis-I could be attributed to low temperature stress conditions prevailing in the pangi valley,where temperature during May and June dip to below freezing,the time the plants enters the reproductive/flowering bud *** is possible that such apparently fertile 2n pollen grains originating from syncytes might play a role in the origin of intraspecific polyploids in the species.

关键词： bivalents cold deserts low temperature stress pangi valley PMCs pollen grains.

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Enumeration of Family Fabaceae from Sechu Tuan Nalla Wildlife Sanctuary,Chamba District,Himachal Pradesh(India)

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Journal of Botanical Research 2022年第2期4卷 29-35页

作者： P.K.Deroliya Harminder Singh Puneet Kumar S.K.Singh Botanical Survey of India Northern Regional Centre192-Kaulagarh RoadDehradunUttarakhand248195India Botanical Survey of India Eastern Regional CentreShillongMeghalaya 793003India

An account of 20 species under 11 genera of the family Fabaceae is presented based upon a thorough study of the collected specimens and field surveys in this paper from Sechu Tuan Nalla Wildlife Sanctuary,Chamba district,Himachal *** these,five taxa are reported first time from the Chamba district of the *** updated nomenclature of the species,local name if any,a brief description of the plant,flowering and fruiting period,distribution in the study area,habitat and ecology and specimen examined have been provided.

关键词： Himalaya pangi valley Astragalus

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