Summary
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1.
The floral members arise as protuberances of the rachilla:—-the order of succession being—glumes, lemma, palea, stamens, lodicules and gynœcium.
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2.
The gynœcium consists of a monocarpellary ovary with a single terminal ovule and two styles.
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3.
There are two integuments, inner forming the micropyle and the outer incomplete; both are 2-layered. InPanicum both the integuments form the micropyle.
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4.
The archesporium comprises of a solitary, hypodermal cell, no parietal cells being formed.Setaria shows a peculiar hypertrophy of one of the epidermal apical cells.
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5.
Tetrad formation is linear; lowest megaspore forms the embryo-sac mother cell.
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6.
The mature embryo-sac is 8-nucleate and of the normal type in all the plants.
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7.
The egg-apparatus is typical, the egg cell is slightly larger than the synergids and elongates considerably after fertilization. It has a heavy deposit of starch grains. The polar nuclei are large and lie in close proximity to the egg where they fuse.
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8.
The antipodals are well developed—the forms varying in the four plants. InEleusine none of the 3 cells divide but become large and prominent; inPanicum they form a tissue of 6 uninucleate cells; inSetaria there are 3–5, 1–4 nucleate cells and inPennisetum there are 6 multinucleate cells.Eleusine has the passive type and the rest the aggressive type of antipodals.
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9.
Fertilization is porogamous and the sperm cell is spherical.
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10.
The primary endosperm nucleus undergoes free nuclear division without rest–wall formation commencing near the embryo first.
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11.
The zygote divides to form a three-celled proembryo, the two terminal ones of which divide and redivide to form the embryo and the basal one the suspensor. The embryo consists of a terminal cotyledon, the coleoptile enclosing the laterally situated stem apex and the coleorhiza enclosing the radicle with its root-cap.
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12.
Of the two integuments, the outer one disintegrates, the inner forming the seed coat; deposits occur in the surviving coat ofEleusine seed. Pericarp development same as recorded for wheat.
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Communicated by Prof. G. P. Majumdar,f.a.sc.
My grateful thanks are due to Dr. I. Banerji under whose personal care and guidance this work has been done.
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Khosla, S. Developmental morphology in some Indian millets. Proc. Indian Acad. Sci. 24, 207–224 (1946). https://doi.org/10.1007/BF03049885
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DOI: https://doi.org/10.1007/BF03049885