Plant Tissue

Tissues The group of cells performing some collective function is called tissue. Tissues organize the body of plant for performing different function. Many types of tissues associate with each other to form tissue system. Vascular system is an example of tissue system. The tissues have following characteristics: Tissues are composed of many cells. These cells may be of one type ...

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SACCHAROMYCES-YEAST

YEAST Yeast are common in soil and on decay fruits. Yeasts are found in ails substrates which are rich in sugary substance. Yeast has great industrial importance. They are used in fermentation of sugar into alcohol. Yeasts are extensively used in bakeries and breweries. S’acc haromyces cerevisiae is commonly used yeast. Yeats extract is commercially used for vitamins synthesis. Yeasts ...

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ALTERNARIA

Occurrence AItemaria is a very common saprophytic fungus. It decomposes the dead part of the plants. A few species of Altemaria can attack on living tissues. Alternaria causes diseases in plants like early blight of potatoes and boll rots of cotton Vegetative structure The body of Alternaria is composed of branched, septate by Mae. Its colour is dark brown. The ...

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Secondary Growth of Root

The roots increase in thickness by the formation of secondary vascular tissues. The secondary vascular tissues are produced by the activity of the vascular cambium. It produces the secondary xylem towards the inner side and secondaryphloem towards the outer side. Secondary growth is common in  gymnosperms and dicotyledonous roots. But it is absent in herbaceous dicots and monocots. Vascular Cambium ...

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PHYLLACTINIA

Scientific classification Kingdom: Fungi Phylum: Ascomvcota Class: Leotionmetes Subclass: Leotiomvcetidae Order: Erysinhales Family: Ervsimhaceae Genus: Phyllactinia Occurrence There are number of species of genus Phyllactinia. P. dalbergiae is commonest species found growing on the leaves of Dalbergia sissou (shnharn). The specimens can be collected in abundance during the winter on the fallen leaves of shisham. This fungus is an obligate ...

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BASIDIOMYCOTA

USTILAGO (Smut) Occurrence Usti.ago is parasite on the grasses like wheat. It is commonly called smut. It attacks on the ovaries of grasses. Sometimes, it completely destoy the whole ears (wheat) and produces black powdery mass of spores. Ustilago tritici is common in Pakistan. It attacks on wheat. Usti’ago avenae attacks on oat. Ustilago nada attacks Or barely. UstPago zeae ...

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STEM STRUCTURE

The internal structure of the stem is more complex. Stem is differentiated into nodes and internodes. The leaves are inserted on the nodes. The arrangement of leaves on the ‘nodes has made the stem more complicated. Stem has three fundamental systems. These tissues systems are epidermis or dermal tissues, ground tissues and vascular tissues. In conifers and dicotyledonous plants the ...

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Puccinia

Occurrence Puccinia is large genus. It has several obligatory parasitic species.tritici is a parasite of wheat. It completes its life cycle in two different hosts: wheat and barely. Thus it is hetcrocious rust. It infects the stem of wheat and causes black or stem rust.   Life cycle The life cycle of Puccina is divided into five stages on the ...

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Phytochrome

Discovery of Phytochrome Phytochrome is a blue-green pigment involved in the perception of photoperiodic stimuli controlling flowering and other growth phenomenon such as seed germination, etc. The discovery of phytochrome was made during studies by Borthwick, Hendricks and their colleagues. They revealed that a pigment system is involved in the germination of lettuce (Lactuca sativa) seeds. They found that germination ...

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Agaricus Campestris

The members of this genus are commonly called mushrooms. Mushrooms grow on soil. They are abundantly found on soil with decry plant material and moisture. The specie ,4garietts campsites is very common. This species is edible. It is cult hated for commercial purposes. General structure The mature plant body is composed of two parts: vegetative mycelium and sporophores Vegetative mycelium: ...

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