• M S Sidhu

      Articles written in Proceedings – Plant Sciences

    • Cytology of woody members of Rosaceae

      V K Singhal B S Gill M S Sidhu

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      Meiotic counts have been made on 16 woody species of the family Rosaceae from Indian forests. Of these,Photinia notoniana (n=17),Rubus gardnerianus (n=28) andSorbus foliolosa (2n=68) are counted for the first time. Besides, the Indian populations ofChaenomeles japonica (n=17),Cotoneaster acuminata andEriobotrya japonica (n=17) are also worked out for the first time. Intraspecific polyploid cytotypes are recorded inPyrus communis (2x, 3x) andRosa leschendultiana (2x, 4x). On the basis of chromosomal associations, the tetraploid cytotypes ofSorbus foliolosa appears to be alloploid in nature whereas the triploid ofPyrus communis show autoploid behaviour. Variation in chromosome number and some pollen sterility in pollen mother cells of meiotically normal diploid individuals ofCotoneaster acuminata (n=17),Prunus domestica ssp.insititia (n=8) andRosa leschenaultiana (n=7) seems to be due to chromatin transfer during cytomixis.

    • Cytological explorations of Indian woody legumes

      V K Singhal B S Gill M S Sidhu

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      Cytological exploration of 47 woody leguminous species have been made from the forests of northern, central and southern India. Of these,Acacia canescens (n=13),Dichrostachys cinerea (n=26),Erythrina caffra (n=21),Millettia brandisiana (n=11),Mucuna hirsuta (n=11),Pahudia martabanica (n=12) andPhanera glauca (n=14) are explored for the first time. Additional and/or variable cytotypes are recorded inBauhinia acuminata (n=13) andProsopis glandulosa (n=28). Existence of B-chromosomes has been recorded inErythrina caffra (n=21+0−3B),Millettia brandisiana (n=11+0−2B),Pongamia pinnata (n=11+0−7B) andTamarindus indica (n=13+0−4B). Besides these cytomorphological variabilities, structural heterozygosity for translocations/inversions (Ougeinia oojeinensis, Pongamia pinnata, Saraca indica) and cytomixis (Caragana brevispina) are also existent.

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