Mastodawn

EMS-Induced Meiotic Configurations in Corchorus capsularis L.: An Arcane Phenomenon of Secondary Associations among Bivalents - #jute #meiocytes #secondaryassociation #meioticindex #pollenfertility #Corchorus #EMS #Corchoruscapsularis - https://link.springer.com/article/10.3103/S0095452725030053

EMS-Induced Meiotic Configurations in Corchorus capsularis L.: An Arcane Phenomenon of Secondary Associations among Bivalents - Cytology and Genetics

Abstract The present report was a detailed observation of secondary association in meiocytes of Corchorus capsularis L. after the assessment of EMS-treated plants. Along with the cytogenetical assessment morphometric parameters, meiotic index (MI) and pollen fertility (%) were also recorded. Morphometric analysis was a preliminary parameter to identify distinct mutant plants from control plants. Tall, dwarf, and branching mutants were tagged in M1 and M2 generations, cytological analysis was carried out, and persistent secondary association was recorded. 10 different groups of secondary associations were frequently formed during prophase and metaphase I among bivalents. EMS, an alkylating agent was used as a mutagen and responsible for malfunctioning in chiasma formation between bivalents. Some other aberrations like stickiness were noted as a consequence of treatment and these aberrations influence the MI and pollen fertility. Aberrant sporads were formed viz. dyads, triads, and polyads with normal tetrads. Pollen fertility and MI declined in contrast to control as a result of a result of the mutagenic impact of EMS in all the mutant plants.

SpringerLink

Cytology and Genetics May 28, 2024

Consequence of Gamma Radiation Induced Cytomixis during Microsporogenesis in Fennel Plant (Foeniculum vulgare Mill.) - #cytomixis #Foeniculumvulgare #gammaradiation #pollenfertility #syncytes #Foeniculum - https://link.springer.com/article/10.3103/S0095452724010109

Consequence of Gamma Radiation Induced Cytomixis during Microsporogenesis in Fennel Plant (Foeniculum vulgare Mill.) - Cytology and Genetics

Fennel is considered as a very important spice crop with powerful therapeutic potential. An improvement in this valuable crop, selected physical mutagen (Gamma irradiation) on the seeds with five selective doses viz., 50, 100, 150, 200 and 250 Gy for break genetic consistency in narrow genetic base in Fennel crop, remunerative phenomenon of syncytes was seen in some cases, where complete chromatin was transmitted to the recipient PMC, that generates dimorphic pollen grain. Such pollen grain with varying genetic content plays a significant role in the emergence of intraspecific polyploidization of species. A curious biological process which is often observed in microsporogenesis of higher plants like, development of syncytes, cytomixis between plant cells and due to this the creation of big pollen has evolutionary relevance. The cytomictic behaviour of Foeniculum vulgare Mill. has been reported in this experiment.

SpringerLink