Use of DArT molecular markers for QTL analysis of drought-stress responses in soybean. I. Phenotypic evaluation of traits

Abstract

Constant research efforts have been undertaken to create and adopt soybean varieties and farming practices that would lead to more drought-tolerant crops. Given that drought-tolerant crops are more stable in terms of price and supply, private genetic companies invest in those genetic materials with the biggest market opportunities. This begs the question: has there been any indication of improvements in drought-tolerance of crops? In this study, we focus on analyzing three soybean distinct relative maturity zones in the state of Missouri and determine if and in what direction is the drought tolerance of these crops changing over time.

Physiological responses and expression of VrDREB2A gene at different growth stages of mungbean (Vigna radiata L. Wilczek) under drought stress

“…plants were rewatered at 20 days after exposure to drought, which is the common duration of drought that plants can stand for. The common symptoms of plants exposed to drought are leaf wilting, rolling and even dropping, and wilting growing tips (Vu et al 2015). Therefore, the more remnant leaves on the plants, the more ability for plants to recover after re-watering.…”

High-Density DArT Markers and Phenotypic Characterization of Cowpea Accessions (Vigna unguiculata (L.) Walp)

“…Several DNA marker systems such as diversity array technology (DArT), restriction fragment length polymorphisms (RFLPs), random amplified polymorphic DNAs (RAPDs), amplified fragment length polymorphisms (AFLPs), single nucleotide polymorphisms (SNPs), and simple sequence repeats (SSRs) are available for genetic study in cowpea and other crop species [14][15][16]. ey offer numerous advantages over phenotype-0 alternatives as they are stable and detectable in all tissues of the plant at any growth stage.…”

“…DArT was first established in rice [17], and the technique has been applied to a range of other crops and fish species [18][19][20]. It has been recently used in combination with phenotypic characters to identify putative QTLs associated with drought stress-response traits in soybean hybrid populations [15]. Similarly, [19] used DArT in genetic dissection of yield associated traits in a cross between cowpea and yard-long bean.…”