Microarray analysis of late-season velvetleaf (Abutilon theophrasti) effect on corn

Abstract

Microarray analysis was used to identify changes in gene expression in corn leaves collected from plants at the V11-14 growth stage that resulted from competition with velvetleaf. The plants were grown in field plots under adequate N (addition of 220 kg N ha Ϫ1) and irrigation to minimize N and water stress. Consequently, only differences resulting from competition for micronutrients, light, and perhaps allelopathic stress were anticipated. Genes involved in carbon and nitrogen utilization, photosynthesis, growth and development, oxidative stress, signal transduction, responses to auxin and ethylene, and zinc transport were repressed in corn growing in competition with velvetleaf. Very few genes were induced because of competition with velvetleaf, and those that were provided little indication of the physiological response of corn. No differences were observed in genes responsive to water stress or sequestering/transporting micronutrients other than zinc, indicating that these stresses were not a major component of velvetleaf competition with corn at the developmental stage tested.

Rapid and early changes in morphology and gene expression in soya bean seedlings emerging in the presence of neighbouring weeds

“…This observation may also account for the conflicting reports of the impact of weeds on the global gene expression profile of crop plants (Horvath et al ., , ; Moriles et al ., ; Afifi & Swanton, ). Recently, Horvath et al .…”

“…() and Horvath et al . () reported downregulation of oxidative stress response genes at later stages of maize development in response to weed competition. The discrepancies in gene expression observed in previous studies and in the present study further stress the importance of analysing gene expression temporally as well as among different tissue types.…”

“…Several investigations into the genomic response of C3 plants to FR‐E light have indicated that genes involved in photosynthesis and oxidative stress are upregulated, whereas genes involved in pest and pathogen defence appear to be downregulated (Horvath et al ., , ; Geisler et al ., ). Changes in gene expression due to FR‐E light have been identified to occur as early as the two leaf tip (V2) stage of maize and third trifoliate (V3) stage of soya bean development (Horvath et al ., , ). Green‐Tracewicz et al .…”

RNAseq reveals weed‐induced PIF3‐like as a candidate target to manipulate weed stress response in soybean

“…Consistent with this association, GSEA also identified numerous ontologies associated with oxidative stress as being significant among genes upregulated by weed‐induced stress. Earlier transcriptomics studies on weed responses of corn to weed stress found the opposite response to oxidative stress responses following season‐long weed stress (Horvath et al ., ). However, studies on shade avoidance in maize seedlings indicated that H 2 O 2 production was stimulated by weed presence (Afifi & Swanton, ).…”

The genetics underlying natural variation of plant–plant interactions, a beloved but forgotten member of the family of biotic interactions

“…thaliana cause differential responses in light sensitivity (Filiault et al ., ). Three studies reported a down‐regulation of photosynthesis genes, all in presence of heterospecifics (Horvath et al ., ; Schmidt and Baldwin, ; Moriles et al ., ). A putative explanation relies on the permanent inhibition of photosynthesis that is induced when the focal plant is challenged in its early development by a neighbor plant, even if the focal plant overtops the neighbor plant later during its life cycle (Horvath et al ., ; Moriles et al ., ).…”