Photosynthate remobilization capacity from drought-adapted common bean (Phaseolus vulgaris L.) lines can improve yield potential of interspecific populations within the secondary gene pool

Shoot and Root Traits Contribute to Drought Resistance in Recombinant Inbred Lines of MD 23–24 × SEA 5 of Common Bean

“…The identification of genotypes with superior plant growth under both optimal and stress conditions, and the identification of traits to help to a better growth and use of resources would be important to increase genetic gains in breeding programs. In common bean, previous research showed that increase in CB production contributes to increase in grain yield under drought stress (Rosales-Serna et al, 2004; Muñoz-Perea et al, 2007; Klaedtke et al, 2012; Assefa et al, 2013; Beebe et al, 2013; Rao et al, 2013, 2016a; Polania et al, 2016a,c). It has also been reported that CB accumulation over time is sensitive to drought stress, as result of reduced transpiration and net photosynthesis (Klaedtke et al, 2012; Mir et al, 2012; Rosales et al, 2012; Rao et al, 2013; Polania et al, 2016a).…”

“…Pod partitioning index (PPI) has been reported as an useful index to determinate the remobilization from vegetative structures to pod production in common bean (Klaedtke et al, 2012; Assefa et al, 2013; Beebe et al, 2013, 2014; Rao et al, 2013, 2016a; Polania et al, 2016a). PPI can be overestimated because it was based on the CB-values at mid-pod filling growth stage with the assumption that this growth stage reflects the maximum vigor.…”

“…The contribution of remobilization of photoassimilates from vegetative structures to the pod and grain production for improving drought resistance has been reported either by estimating dry matter partitioning indices such as HI, PPI, and PHI (Hall, 2004; Rosales-Serna et al, 2004; Klaedtke et al, 2012; Rosales et al, 2012; Assefa et al, 2013; Rao et al, 2013, 2016a; Beebe et al, 2014; Rao, 2014; Polania et al, 2016a,c) or by quantifying starch and sugar accumulation and partitioning (Cuellar-Ortiz et al, 2008; Rosales et al, 2012; Andrade et al, 2016). Field evaluation in this study over three seasons under intermittent drought stress showed stronger correlation between PHI and GY confirming the contribution of mobilization of photosynthates from pod walls to grain (Table 1).…”

“…This penalty in GY per day could be markedly reduced or even completely eliminated through improved physiological efficiency of the plant through genetically improving the capacity of the plant to produce more seeds and especially together with the ability to have better filling of these seed under drought stress (i.e., greater sink strength). In common bean different field studies showed that early maturing genotypes with superior photosynthate remobilization ability can yield better under both drought and irrigated conditions (Klaedtke et al, 2012; Rao et al, 2013, 2016a; Beebe et al, 2014; Polania et al, 2016a,c). This improved physiological efficiency under drought stress was shown to be independent of yield potential and phenological plasticity (Polania et al, 2016c).…”

Improving adaptation to drought stress in white pea bean (Phaseolus vulgaris L.): Genotypic effects on grain yield, yield components and pod harvest index

“…Pod harvest index (PHI) reflects partitioning of photosynthates to grain under drought conditions (Klaedtke et al, 2012;Polania et al, 2016). reported that improving PHI could be the best way to improve common bean adaptions to drought.…”