06%20Growth%20Development%201

06%20Growth%20Development%201 - Plant Growth and...

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Plant Growth and Development part 1 Objectives for today’s lecture Learn about primary growth How roots grow longer How plants become taller Learn where branches come from Learn about secondary growth How plant stems increase in diameter
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Plant Growth and Development Importance to horticulture Many horticultural practices are designed to manipulate growth and development of the plant Pruning and pinching Training Thinning The biological principles that underlie these procedures allows you to understand how they work
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before pruning after pruning Manipulating plant growth: Pruning Fruit trees are pruned to develop an efficient structure to bear fruit and to maximize interception of light
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Manipulating plant growth: Training Plants are trained for both decorative and practical reasons
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Manipulating plant growth: Shaping Trees and shrubs are shaped for commercial and aesthetic reasons Christmas trees Topiary
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Bonsai A fine example of controlling plant growth and development
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Growth and differentiation Growth a small cell getting larger one cell dividing to become many cells Differentiation a cell becoming specialized to perform a specific function
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division division Two processes at work in plant growth At the cellular level, two processes contribute to plant growth Cell division The source of new cells for growth of an organ or tissue
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enlargement Two processes at work in plant growth Cell enlargement An increase in the volume of a cell The combined effects of cell division and cell expansion lead to growth of plant organs and to the increase in size of a plant
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Followed by differentiation Cells develop specialized functions within an organ For example, differentiation of cells into specific components of the vascular system, such as xylem vessels, phloem sieve tubes or companion cells
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Growth of plant roots You might think that the root could elongate if growth took place at any one (or all) of these sites: Along the entire length of the root At the top of the root, at the junction between root and shoot At the apex or tip of the root But only one of these is correct
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