Effects of N application methods on cotton yield and fertilizer N recovery efficiency in salinity fields with drip irrigation under mulch film using N tracing technique.

Introduction: Drip irrigation under mulch film promotes a non-uniform salinity distribution in salt fields. The effect of different N application methods on the growth and yield of cotton under drip irrigation under mulch film conditions in eastern coastal saline-alkaline soils in China remain remained unclear.

Methods: A randomized complete block design was used in the experiment.

C-terminally encoded peptides act as signals to increase cotton root nitrate uptake under nonuniform salinity.

Soil salinity is often heterogeneous in saline fields. Nonuniform root salinity increases nitrate uptake into cotton (Gossypium hirsutum) root portions exposed to low salinity, which may be regulated by root portions exposed to high salinity through a systemic long-distance signaling mechanism. However, the signals transmitted between shoots and roots and their precise molecular mechanisms for regulating nitrate uptake remain unknown.

Light induced shoot-sourced transcription factor HY5 regulates the nitrate uptake of cotton by shoot-to-root signal transport.

Elongated hypocotyls 5 (HY5) is a transcription factor that can be induced by illumination and promotes nitrate uptake in Arabidopsis. However, whether GhHY5 regulates nitrate uptake in cotton is unknown. In this study, the cotton seedlings growing in light and dark conditions were treated with N-labeled nutrient solution to study whether the GhHY5 regulates nitrate uptake in cotton.

Seeding depth and seeding rate regulate apical hook formation by inducing GhHLS1 expression via ethylene during cotton emergence.

Apical hook formation is essential for the emergence and stand establishment of cotton plants. Searching for agronomic measures to regulate apical hook formation and clarifying its mechanism are important for full stand establishment in cotton. In this study, cotton seeds were sown at varying seeding rates or depths in sand to determine if and how apical hook formation was regulated by seeding rates or depths.

Global gene expression in cotton (Gossypium hirsutum L.) leaves to waterlogging stress.

Cotton is sensitive to waterlogging stress, which usually results in stunted growth and yield loss. To date, the molecular mechanisms underlying the responses to waterlogging in cotton remain elusive. Cotton was grown in a rain-shelter and subjected to 0 (control)-, 10-, 15- and 20-d waterlogging at flowering stage.

[Effects of fertilization on cotton growth and nitrogen use efficiency under salinity stress].

Cotton (Gossypium hirsutum) was raised at different salinity levels (0, 0.15% and 0.30%) by irrigating with fresh- or sea-water.

Gene expression profiles deciphering leaf senescence variation between early- and late-senescence cotton lines.

Leaf senescence varies greatly among genotypes of cotton (Gossypium hirsutium L), possibly due to the different expression of senescence-related genes. To determine genes involved in leaf senescence, we performed genome-wide transcriptional profiling of the main-stem leaves of an early- (K1) and a late-senescence (K2) cotton line at 110 day after planting (DAP) using the Solexa technology. The profiling analysis indicated that 1132 genes were up-regulated and 455 genes down-regulated in K1 compared with K2 at 110 DAP.