By B. M. Johri (auth.), Professor Brij Mohan Johri (eds.)
A very long time in the past botany was once considered as the scientia amabilis, the pleasant technological know-how, eminently appropriate for leisured amateurs. on account that then, and especially during this century, it has grown vastly in its significance and in its intimate contacts with a variety of different disciplines of technological know-how, a few of which, like plant genetics and plant body structure, at one time certainly was integrated below the huge time period botany. however such topics have increased into significant clinical fields in their personal, botany, the mummy technology, maintains to take care of its imperative position: the reason for this is that it bargains with crops which represent probably the most important life-supporting platforms of this planet. in addition, interacting and profiting from advances made in different sciences, it has progressively advanced in a couple of parts. Experimental embryology of vascular vegetation is one such box the place superb advances were made lately. The time is consequently quite opportune for the ebook of an authoritative publication at the topic. it's very applicable that the booklet has been deliberate and edited by means of Professor B. M. Johri, certainly one of India's most efficient botanists, whose contributions in embryology, plant morphology and morphogenesis are the world over identified. He used to be heavily linked over a couple of years with Professor P. Maheshwari, the nice botanist and embryologist, to whom the publication is dedicated.
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Extra resources for Experimental Embryology of Vascular Plants
Example text
Experimental Embryology of Gymnosperms 33 salt medium lacking phytohormones. Cotyledon explants obtained from 1 to 3-week-old seedlings also produced adventitious buds when similar procedures were employed. Moreover, tissue subcultured three to four times at about 3-week intervals still retained a potential for bud formation. 1 mg/l BAP produced shoots from cotyledons (Winton and Verhagen 1977). 1 BAP-medium. After transfer of embryos or excised cotyledons to media without hormones, the vigorous shoots developed normally, but the small multiple shoots did not.
I). One type is found in cycads (Cycadales) and Ginkgo (Ginkgoales) in which a major departure from a more common gymnosperm pattern lies in the development of the microgametophyte. The pollen (immature microgametophyte), which is three-celled at the time of pollination, is drawn through the micropyle by the micropylar fluid and comes to lie in a cleft in the nucellus (the pollination chamber), where it slowly develops over a period of about 8-10 months into a mature microgametophyte containing, with one exception, two flagellated and motile male gametes.
But our understanding of genomic control over embryo activities is severely limited. We need to learn more about the expression of genetic potential of the plant embryo, and how it is influenced by the environment. Unfortunately, this is probably the most difficult aspect of embryogenesis to study, partly because the plant embryo is enclosed and in immediate contact with parental tissue and partly because, as pointed out earlier, the immediate environment contributes significantly to the development of the embryo.