Male and female meiosis evince differential patterns in chiasma formation: a case study of ornamental plant, Delphinium ajacis L.

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dc.contributor.authorKoul, K. K.en_US
dc.contributor.authorNAGPAL, Anjnaen_US
dc.contributor.authorNain, Kamalen_US
dc.date.accessioned2020-11-18T10:21:07Z
dc.date.available2020-11-18T10:21:07Z
dc.date.issued2020-05
dc.description.abstractChromosomal behaviour during megasporogenesis and microsporogenesis has been studied in ornamental Delphinium ajacis L. Meiosis in female sex cell initiates later than male. The floral buds which carry egg mother cell (EMC) at diplotene stage has pollen mother cells (PMCs) at tetrad stage of meiosis suggesting protandry. Although the 16 chromosomes formed regular eight bivalents in both the sex cells, they differed in overall chiasma frequency which was 32.95% higher in EMCs and found to be 18.52 ± 2.12 per cell. In PMCs, the average chiasma frequency recorded was 13.93 ± 1.40 per cell. Interestingly, this variation in chiasma frequency was largely confined to the two large bivalents which shared 42.61% chiasma per EMC. The use of Q–Q plot, Box plot and Whisker plot showed departure in the chiasma frequency distributions in EMCs and PMCs from the normal distribution pattern. The difference in chiasma frequency in the two sex cells was significant at all levels as indicated by the low P values of 3.094 9 10-11 obtained from nonparametric test, i.e. Wilcoxon rank-sum test. It is suggested that the two different mechanisms of recombination are operational in the two sex cells, and the sex differences of chiasma frequency could have arisen due to differential epigenetic modifications of the chromatin which pattern the double-strand breaks, and the position and frequency of crossing over visible as chiasmata.en_US
dc.identifier.affiliationsDepartment of Botany, Hindu College, University of Delhi, Delhi 110 007, Indiaen_US
dc.identifier.affiliationsDepartment of Botany, Ramjas College, University of Delhi, Delhi 110 007, Indiaen_US
dc.identifier.affiliationsDepartment of Statistics, Hindu College, University of Delhi, Delhi 110 007, Indiaen_US
dc.identifier.citationKoul K. K., Nagpal Anjna, Nain Kamal. Male and female meiosis evince differential patterns in chiasma formation: a case study of ornamental plant, Delphinium ajacis L.. Journal of Genetics. 2020 May; 99: 1-7en_US
dc.identifier.issn0022-1333
dc.identifier.issn0973-7731
dc.identifier.placeIndiaen_US
dc.identifier.urihttps://imsear.searo.who.int/handle/123456789/215522
dc.languageenen_US
dc.publisherIndian Academy of Sciencesen_US
dc.relation.volume99en_US
dc.source.urihttps://doi.org/10.1007/s12041-020-1179-xen_US
dc.subjectfemale meiosisen_US
dc.subjectprotandryen_US
dc.subjectchiasmataen_US
dc.subjectepigenetic modificationsen_US
dc.subjectDelphinium ajacisen_US
dc.titleMale and female meiosis evince differential patterns in chiasma formation: a case study of ornamental plant, Delphinium ajacis L.en_US
dc.typeJournal Articleen_US
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