Molecular Aspects of Drought Tolerance in Pearl millet [(Pennisetum glaucum) L. (Br.)]
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Date
2017
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College of Agriculture, Swami Keshwanand Rajasthan Agricultural University
Abstract
Environmental stresses, such as drought, salinity, cold and heat cause
adverse effects on the plant growth and development. Drought stress, the
major constrain for crop productivity, is affecting 1/3 of arable land world-wide
and will probably increase in the on-going climate changes. Drought, being
the most important environmental stress, severely impairs plant growth and
development, limits plant production and the performance of crop plants, more
than any other environmental factor (Shao et al., 2009).
Drought impacts include growth, yield, membrane integrity, pigment
content, osmotic adjustment, water relations, and photosynthetic activity
(Benjamin and Nielsen, 2006; Praba et al., 2009). Drought stress is affected
by climatic, edaphic and agronomic factors. The susceptibility of plants to
drought stress varies in dependence of stress degree, different accompanying
stress factors, plant species, and their developmental stages (Demirevska et
al., 2009). Acclimation of plants to water deficit is the result of different events,
which lead to adaptive changes in plant growth and physio-biochemical
processes, such as changes in plant structure, growth rate, tissue osmotic
potential and antioxidant defenses (Duan et al., 2007).