BIODIVERSITY NOTE SEM 6
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Shilong view 2011
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Different Areas of the Root Absorb Different Minerals
Different Areas of the Root Absorb Different Minerals When diffusion is too slow to maintain high nutrient concentrations near the root, a nutrient depletion zone forms adjacent to the root surface. This zone extends from about 0.2 to 2 mm from the root surface depending on the mobility of the nutrient in the soil. Without growth, roots would rapidly deplete the soil adjacent to their surface Optimal nutrient acquisition therefore depends both on the capacity for nutrient uptake and on the ability of the system to grow into fresh soil. (a) Root absorption of calcium in barley appears to be restricted to the apical region. (b) Iron may be taken up either at the apical region, as in barley or over the entire root surface, as in corn. Potassium, nitrate, ammonium and phosphate can be (C)absorbed freely at all locations of the root surface but in corn the elongation zone has the maximum rates of potassium accumulation and nitrate absorption (d) In corn and rice, the root apex absorbs...
Genomic DNA and c-DNA Distinguish
Properties c-DNA Genomic DNA (i) Principle A fragment is a clone DNA of an active m-RNA generated by enzyme reverse transcriptase. The fragment of desired gene is directly obtain from the restriction digestion of genomic DNA. (ii) Use of primer When eukaryotic m-RNA is used as template the poly T oligonucleotide is conveniently used as primer. Either no primer is used or site specific primer is used. (iii) Utility in case of prokaryotic DNA The c-DNA is absolutely essential when the expression of an eukaryotic gene is required in a prokaryot. The prokaryotic genomes do not contain any inhtron. So, their genomic library is directly expressed in the expression vector in appropriate prokaqryotic host. ...
AGROFORESTRY IN INDIA
AGROFORESTRY IN INDIA Agroforestry can be defined as an economically based land use management system that is the integration of agriculture where trees are grown around the crops as a shelterbelt or among them. Agroforestry can combat climate change, sustains economic, social and environmental benefits for the people and also important for carbon sequestration. This article highlights agroforestry practices in India. They include the history, scope of agroforestry in India also the agrobiodiversity hotspots areas and practices in different regions. Introduction: Agroforestry is the combination of agriculture and forestry which is beneficial to soil erosion, soil fertility, biodiversity, economy of farmers and sustainability of nature. Agroforestry is a land use system where trees are grown with crops around or among them. India is predominantly agriculture-based country. More than 75 per cent Indian population lives in villages and they are dependent on agriculture,...