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Disruption of early seed developmental programs underlies abnormal seed formation in Brassica napus

ABSTRACT: Early seed development is critical for determining subsequent growth trajectories, seed size, and final yield. A proportion of seeds exhibit growth retardation during early development after pollination, and this early stage is critical for determining subsequent seed abortion and final yield in Brassica napus L. However, the mechanisms underlying the formation of these abnormal seeds remain largely unknown. We combined continuous phenotypic characterization with transcriptome profiling to investigate the developmental process and regulatory mechanisms underlying abnormal seed formation. The results showed that the size difference between abnormal and normal seeds was already established at 4 days after pollination (DAP). It is suggested that extensive disturbance in abnormal seeds at 4 DAP, accompanied by disruptions in key biological processes including endosperm development and phytohormone responses. Several candidate genes, including BnaCYP78A9 and BnaWRKY10, were highly expressed in normally developing seeds but were significantly downregulated in abnormal seeds, indicating that they may be associated with the regulation of early seed development. Our findings identify early seed developmental deviation as a key factor influencing seed abortion and yield in rapeseed, provide new insights into the basis of seed formation, and advance understanding of seed size regulation.

ORGANISM(S): Brassica napus

PROVIDER: GSE346773 | GEO | 2026/09/15

REPOSITORIES: GEO

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Project description:To better undersand the effects of drought stress on wheat developing seeds, the transcription profile of early developing wheat seeds under control and drought stress conditions were comparatively analyzed by using the Affymetrix wheat geneChip. Drought stress is a major yield-limiting factor for wheat. Wheat yields are particularly sensitive to drought stress during reproductive development. Early seed development stage is an important determinant of seed size, one of the yield components. We specifically examined the impact of drought stress imposed during postzygotic early seed development in wheat. We imposed a short-term drought stress on plants with day-old seeds and observed that even a short-duration drought stress significantly reduced the size of developing seeds as well as mature seeds. Drought stress delayed the developmental transition from syncytial to cellularized stage of endosperm. Coincident with reduced seed size and delayed endosperm development, a subset of genes associated with cytoskeleton organization was misregulated in developing seeds under drought-stressed. Several genes linked to hormone pathways were also differentially regulated in response to drought stress in early seeds. Notably, drought stress strongly repressed the expression of wheat storage protein genes such as gliadins, glutenins and avenins as early as 3 days after pollination. Our results provide new insights on how some of the early seed developmental events are impacted by water stress, and the underlying molecular pathways that can possibly impact both grain size and quality in wheat. Winter wheat cultivar Redland, PI 502907 (Triticum aestivum L.) was used for this study. Seedlings were vernalized at 4°C for 6 weeks and then transplanted to a one gallon pot of soil-sand mixture (3:1, v/v) and grown in a growth chamber under the following conditions: relative humidity, 50–70%; 16-h light/8-h dark photoperiod; 21°C daytime temperature and 18°C nights. Plants were watered regularly twice daily at the rate of 100ml/ per pot. Because, wheat has an asynchronous fertilization pattern for ovlues in the inflorescence, each floret needs to be specifically marked for timing the fertilization and stress induction. After spikes developed, unfertilized ovules were monitored and observed for the fertilization process. Closed wheat spikes with anthers outside were marked as fertilized. Drought stress was imposed 24h after the fertilization (HAF). Drought stress treatment was initiated by discontinuing watering on the drought treatment plants while control plants were regularly watered twice daily. Stress treatment was applied at 48 HAF and relieved at 96 HAF. The microarray study focuses on 24 HAF to 72 HAF in control and drought stress conditions. We started to impose drought stress 24HAF.

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Disruption of early seed developmental programs underlies abnormal seed formation in Brassica napus

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