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Water Stress Essay

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Abstract
Water stress is one of the challenging problems faced in agriculture. More often, crop growth and yield fails when exposed to it. The water requirement for growth and productivity is crop specific and the plants tend to develop own defense mechanism to combat the stress. It is highly imperative to study the response of plant to water stress in view of understanding their water requirement. The present study on growth and photosynthetic gas exchange characteristics in response to water stress in organically grown Solanum aethiopicum and Solanum macrocarpon was conducted under greenhouse condition employing four different levels of water 100% PC (pot capacity), 75% PC, 50% PC and 25% PC. The growth performance and photosynthetic gas exchange characteristics were significantly decreased with decrease in water level. However, S. aethiopicum reacted differently to the effected water levels. The normal performance of S. aethiopicum even at 50% PC at par with 75% PC points towards, high tolerance to water deficit conditions. Detail studies on crop physiology and the mechanism of drought tolerance in S. aethiopicum can be explored to establish more facts.
Additional key words: solanaceae family; drought stress; photosynthetic rate; water use efficiency; organic farming.
Introduction
Solanum …show more content…

Water scarcity imposes huge reductions in crop yield and is one of the greatest limitations to crop expansion. There is always a chance of increased aridity in future due to global climate change (IPCC, 2001).The effects of water stress, however, vary with plant species. Water being the critical factor for physiological function of the plant, present study was envisaged for assessing the performance of crops in terms of growth and photosynthetic activities at different levels of

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