EMS-induced cytomictic variability in safflower (<Emphasis Type="Italic">Carthamus tinctorius</Emphasis> L.) |
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Authors: | P Srivastava G Kumar |
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Institution: | (1) Department of Botany, Punjabi University, Patiala, 147002, Punjab, India |
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Abstract: | Seeds of safflower (Carthamus tinctorius L.) were subjected to three treatment durations (3, 5 and 7 h) of 0.5% Ethyl Methane Sulphonate (EMS). Microsporogenesis was carried out in the control as well as in the treated materials. EMS treated plants showed interesting feature of partial inter-meiocyte chromatin migration through channel formation, beak formation
or direct cell fusion. Another interesting feature noticed during the study was the fusion among tetrads due to wall dissolution.
The phenomenon of cytomixis was recorded at nearly all the stages of microsporogenesis connecting from a few to several meiocytes.
Other abnormalities such as laggards, precocious movement, bridge and non-disjunction of chromosomes were also recorded but
in very low frequencies. The phenomenon of cytomixis increased along with the increase in treatment duration of EMS. Cells with these types of cytomictic disturbances may probably result in uneven formation of gametes or zygote, heterogenous
sized pollen grains or even loss of fertility in future. |
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