Fig. 1

Drought stress responses and variation among a panel of 18 cotton genotypes, including six from each three-cotton species G. hirsutum, G. barbadense, and G. arboreum. a Hierarchical Cluster and Dendrogram, genotypes are distributed in two major (G1 and G2) and four sub-groups (g1, g2, g3, and g4). b Graphs of cumulative drought stress response index (CDSRI) including cumulative drought stress response index of shoot traits (CDSRI-S) and root traits (CDSRI-R) for 18 genotypes of three cotton species. c groups. c & d Biplot (Principal component analysis) of drought stress response indices (DSRI) for morpho-physiological and early root growth traits at the seedling stage. Scatter-plot shows the distribution of identified drought tolerant (purple) and susceptible (orang) cotton genotypes. Here PH, plant height; ChC, chlorophyll contents; LN, leaf number; LA, leaf area; LT leaf temperature; LFW, leaf fresh weight; LDW, leaf dry weight; LDW, leaf turgid weight; RWC, relative water contents; RL, root length; ARA, analyzed region area; ARW analyzed region width; ARH, analyzed region height; SA surface area; LPA, root length per area; AD average diameter; RV, root volume; RH, root heigh; RN root number; RF root forks; RC root crosses; RW root weight and R/S, root to shoot ratio