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Seedling Stage Drought-Induced Phenotypes and Drought-Responsive Genes in Diverse Cowpea Genotypes

^a Nematology Dep., Univ. of California, Riverside, CA 92521
^b Botany and Plant Sciences Dep., Univ. of California, Riverside, CA 92521.The work was funded in part by Bean/Cowpea Collaborative Research Support Program, USAID Grant no. GDG-G-00-02-00012-00. The opinions and recommendations herein are those of the authors and not necessarily those of USAID

View larger version (58K): [in this window] [in a new window]   Figure 1. (A–C) Survival scores (scale: 1, recovery from apical meristem; 0.5, recovery from basal meristem; 0, no recovery) and (D–F) recovery dry weights of 14 drought-stressed cowpea genotypes in three greenhouse experiments (A and D, Exp. 1; B and E, Exp. 2; C and F, Exp. 3). Bars are ±1 standard error. Survival scores are for two plants per replicate in A, therefore highest score can be 2 and lowest score can be 0.

View larger version (51K): [in this window] [in a new window]   Figure 2. Phenotype scores of (A) stem greenness, (B) field drought-induced senescence, (C) unifoliate senescence, (D) wilting, and (E) trifoliate abscission for 14 drought-stressed cowpea genotypes. Data were combined for three greenhouse experiments in A, C, D, and E and for two field experiments in B. Genotype 11979 is missing in B. Bars are ±1 standard error.

View larger version (121K): [in this window] [in a new window]   Figure 3. Representative phenotypes observed in 14 drought-stressed cowpea genotypes showing differences in (A) apical vs. (B) basal meristematic recovery 14 d after reintroduction of water; (C) maintenance of stem greenness vs. (D) stem yellowing 27 d after watering (DAW); (E) gradual unifoliate senescence (left) vs. no unifoliate senescence (right) and (F) gradual unifoliate senescence (left) vs. rapid unifoliate senescence (right) 14 DAW; (G) nonwilting vs. (H) severe wilting 14 DAW; (I) trifoliate abscission vs. (J) no trifoliate abscission 27 DAW; and (K) nodal anthocyanin accumulation vs. (L) no anthocyanin accumulation 16 DAW.