Soybean physiology and gene expression during drought

Abstract

ABSTRACT. Soybean genotypes MG/BR46 (Conquista) and BR16, drought-tolerant and -sensitive, respectively, were compared in terms of morphophysiological and gene-expression responses to water stress during two stages of development. Gene-expression analysis showed differential responses in Gmdreb1a and Gmpip1b mRNA expression within 30 days of water-deficit initiation in MG/BR46 (Conquista) plants. Within 45 days of initiating stress, Gmp5cs and Gmpip1b had relatively higher expression. Initially, BR16 showed increased expression only for Gmdreb1a, and later (45 days) for Gmp5cs, Gmdefensin and Gmpip1b. Only BR16 presented down-regulated expression of genes, such as Gmp5cs and Gmpip1b, 30 days after the onset of moisture stress, and Gmgols after 45 days of stress. The faster perception of water stress in MG/BR46 (Conquista) and the better maintenance of up-regulated gene expression than in the sensitive BR16 genotype imply mechanisms by which the former is better adapted to tolerate moisture deficiency.

Genotypic variations in growth, yield and yield components of soybean genotypes under drought stress conditions

“…Water stress significantly reduced the total leaf area. Under stress, drought tolerant soybean cultivars exhibited a larger leaf area when compared with less tolerant cultivars (Moreira et al, 2010). Leaf area of ten soybean genotypes at different growth stages under non-stress and water stress environments showed significant differences (Table 3.).…”

Cloning and expression analysis of cysteine protease gene (MwCP) in Agropyron mongolicum Keng

“…Environmental stresses such as drought can greatly damage crop production (Stolf-Moreira et al, 2010). Several researchers have conducted systematic research on the morphological, physiological, and molecular characteristics of drought-resistant plants (Nassar et al, 2010;Reis et al, 2014).…”

Expression profiling of PAP3, BZIP, and P5CS genes in soybean underdrought stress conditions

“…Northern blot analysis revealed that NaCl stress caused a general induction of GmPAP3 expression in both roots and leaves of various cultivated (Glycine max) and wild (Glycine soja) soybean varieties (Liao et al, 2003). In another study, GmPAP3 gene expression was reported to have increased under drought stress in soybean (Zhu et al, 1998;Stolf-Moreira et al, 2010).…”