• M V Thombre

      Articles written in Proceedings – Plant Sciences

    • Cytological investigations in back-crosses and amphidiploids in Hibiscus (L.) species

      R C Patil M V Thombre

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      Cytological observations in amphidiploids of the F1sH.acetosella (2n=72) ×H. cannabinus (2n = 36) andH. radiatus (2n=72) ×H. cannabinus (2n=36) and backcrosses of these F1s withH. acetosella andH. cannabinus, showed highly irregular chromosomal behaviour. These meiotic irregularities are considered as the probable causes for different degrees of the sterility exhibited by these plants. Perenniality and branching habit, wilt resistance, high fibre yield, inH. acetosella andH. radiatus appeared to be due to factors present in its B genome. The possibilities of transferring these factors toH. cannabinus, the cultivated types have been explored.

    • Cytomorphological studies in x-ray induced glandless haploids inGossypium hirsutum L. (cotton)

      S S Mehetre M V Thombre

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      Six haploid plants were obtained in M2 generation of the 25 kr. x-ray irradiatedGossypium hirsutum L. cotton variety H.G. 108. The cytomorphological studies on these plants indicated highly irregular meiosis, giving on an average six bivalents, the range being 0–9. Unequal separation of chromosomes and chromatids at anaphase-I and II respectively led to formation of abnormal tetrads and pollens with high size variations leading to high pollen sterility. These plants were characterized by miniature stature, shorter stem and internodes, smaller leaves, flowers and stomata with fewer chloroplasts, male and female sterility and halving of chromosomes. The reduction in morphological characters was nearly in the proportion of 1∶2 as compared to their diploid counterparts.

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