• A Pillai

      Articles written in Proceedings – Plant Sciences

    • Developmental anatomy of Ranales. III apical organisation and dormancy in roots

      K Y Kavathekar A Pillai

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      Root apical organisation inAnnona squamosa, Artabotrys odoratissimus,Polyalthia longifolia, Nigella sativa, Ranunculus sceleratus, Clematis triloba andMichelia champaca falls into two types: Type I—Annona,Artabotrys, Polyalthia,Michelia andNigella, show a common group of initials around which the derivatives differentiate into the root cap, epidermis, cortex and central cylinder. Type II—Ranunculus andClematis, show discrete initials for the plerome, periblem, dermocalyptrogen and columella. The arboreal species investigated show a common group of initials and the herbaceous ones (exceptNigella) discrete initials at the root apex. This may be of phylogenetic significance.

    • Developmental anatomy of some oil-yielding plants III. The seedling shoot apex

      Suresh C Goyal K Y Kavathekar S Satija A Pillai

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      Development of the shoot apex inSesamum indicum Linn, andEruca sativa Mill, was followed from the mature embryo to early reproductive stages. The shoot apex shows an age-related increase in size until the reproductive phase sets in. In both species, the epicotyl apex is flat with a single tunica layer covering a homogeneous corpus. InSesamum the 3-day old seedling apex shows the early stages in the establishment of cytohistological zonation in the corpus leading to well-established zonation in the dome-shaped 4-day old seedling apex. InEruca the maximal stage of the 3-day old seedling apex is a low dome and zonation in the corpus is well established in the 4-day old apex. Establishment of zonation seems to be related to the size of the apex in the first place and probably to the shape also as applied to particular species. The sequence of establishment of zones is, the peripheral zone first followed by the corpus mother cells and pith meristem zones almost simultaneously.

    • Seedling anatomy ofBrassica campestris L

      S Babber A Pillai

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      Vascular orientation of one week old seedling ofBrassica campestris Linn. has been studied. The studies rule out the possibility of splitting and torsion of xylem; instead there is a gradual inward shifting of the xylem differentiation pole. Unlike the existing reports,Brassica campestris Linn., in spite of having epigeal germination, shows the continuity of primary vasculature of root-hypocotyl-cotyledon in the first and second foliar node. The cotyledonary node is unilacunar two trace which supports Bailey’s suggestion of unilacunar double trace as a basic type.

    • Seedling anatomy of some Asclepiadaceae

      S Satija S C Goyal A Pillai

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      Two-day and eight-day old seedlings ofAsclepias curassavica, Calotropis procera andLeptadenia pyrotechnica were studied. The basipetally differentiating epicotylar vasculature and the root-hypocotyl-cotyledonary vasculature are ontogenetically separate units. The cotyledonary node is unilacunar two-trace and the foliar nodes, unilacunar one trace. The unilacunar two trace cotyledonary nodes in advanced families like Apocyanaceae and Asclepiadaceae seem phylogenetically significant.

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