Drought Resistance Traits in Terms of the Passioura Water Model
peanut populations, in which a selection index approach utilizing T, WUE, and HI is assessing the value of these traits in a large-scale breeding program in India and Australia.144!
Although drought is commonly referred to as “prolonged water deficit” periods during a crop’s life, it is indeed a complex syndrome with various climate pressures operating together in infinite combinations, resulting in significant reductions in crop performance. Historically, options for managing agricultural drought have revolved around management techniques such as deep tillage, mulching, intercropping, etc. However, future options for drought management will increasingly be based on the genetic improvement of crops for targeted environments. With genetic options, matching phenology to water availability in target environments has proven to be highly a successful approach. Although our understanding of drought resistance mechanisms has improved significantly, it is essential to distinguish the traits linked to short-term responses from those which are important when integrated over longer time scales.
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