How to write a historical background of plant
James concluded that "it is now widely accepted that Chlorophylla green-colored, magnesium -containing pigment is essential to this process; it is generally present in plant leavesand often in other plant parts as well.
De-novo organ initiation and formation under aseptic culture form a fascinating subject to study the effect of different factors on the morphogenetic patterns. South Africa is home to a range of lesser known and neglected plant fossils, called the glossopterids.
Measures to be taken for maintaining asepsis during tissue culture are: i. Jan Helmont — by experimental observation and calculation, noted that the increase in weight of a growing plant cannot be derived purely from the soil, and concluded it must relate to water uptake.
New finds South Africa has a huge potential for new fossil discoveries, with vast territories still waiting to be explored, yet very few researchers are studying fossil plants and insects.
At the largest scale is the study of plant growth habit, the overall architecture of a plant.
Roots allowed plants to grow taller and faster. In England, various herbals in either Latin or English were mainly compilations and translations of continental European works, of limited relevance to the British Isles. For e. The botanical gardens of the modern tradition were established in northern Italy, the first being at Pisa , founded by Luca Ghini — Micro propagation is the technique of in-vitro production of the clones of plants i. Petrified wood is often heavily silicified the organic material replaced by silicon dioxide , and the impregnated tissue is often preserved in fine detail. Callus cultures are useful in plant pathology as they act as an effective tool in the study of mechanism of disease resistance and susceptibility. Soma clonal variations are usually heritable for qualitative as well as quantitative characters of plants. The plant morphologist goes further, and discovers that the spines of cactus also share the same basic structure and development as leaves in other plants, and therefore cactus spines are homologous to leaves as well. Increasing complexity of the ancestrally simple sporophyte, including the eventual acquisition of photosynthetic cells, would free it from its dependence on a gametophyte, as seen in some hornworts Anthoceros , and eventually result in the sporophyte developing organs and vascular tissue, and becoming the dominant phase, as in the tracheophytes vascular plants. The genotypic modifications can also be possible. An effective vascular system was required in order to achieve greater heights. These two systems are common to nearly all vascular plants, and provide a unifying theme for the study of plant morphology.
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