The lack of understanding of the physiological mechanisms underlying drought sensitivity during germination

The gap

Evidence profile

Sourced from the future work and stated challenges and stated research gap and abstract of the source papers, classified as general, drawn from work published between 2024 and 2026, spanning 5 journals. Those papers have been cited 136 times in total.

Supporting evidence — 5 representative gaps

• Cotton Seed Germination Under the Main Abiotic Stress: Physiological Mechanisms, Molecular Responses, and Agronomic Strategies (2026) · Plants · doi

  Against a backdrop of accelerating climate change and increasingly frequent weather extremes, improving germination-stage tolerance is vital for securing uniform emergence, robust seedling establishment and final yield of cotton, the world’s dominant fiber crop. Insight into these mechanisms is indispensable for stabilizing global cotton supply and for easing competition between food and fiber for limited arable land. Germination is a critical stage at which cotton is severely affected by abiotic stress [164]. Salinity, drought and tem- perature extremes inhibit water uptake, disturb ABA/GA balance, trigger reactive oxygen species bursts, damage membrane integrity and function, disrupt energy metabolism and heighten vulnerability to pathogens, collectively reducing germination percentage and seedling quality. Nevertheless, cotton seeds have evolved both stress-specific and conver- gent protective strategies. Under salt stress the seed mobilizes osmotic adjustment, ion sequestration, antioxidant enzymes and ABA/GA signaling; quantitative trait loci and key regulators such as GhSnRK2.6 and GhCIPK6a have been identified. During drought, plastic root architecture, accumulation of compatible solutes, activation of antioxidant defense and transgenerational stress memory enhance survival, with GhADF1 and GhMPK7 emerging as important molecular nodes. Cold adaptation is closely linked to increased membrane- lipid unsaturation, elevated antioxidant capacity, hormonal re-balancing and maintained energy metabolism. Intriguingly, membrane lipid remodeling emerges as a convergent mechanism across cold and drought responses, reflecting shared biophysical constraints on cellular membrane integrity. This convergence suggests that lipid unsaturation pathways could serve as multi-stress breeding targets. By contrast, the physiological and molecular mechanisms of heat stress on cotton germination remain essentially uncharacterized, a gap that is particularly urgent given global warming trends. Mitigation strategies require hierarchical deployment. Traditional agronomic practices include mulching, which raises topsoil temperature by 2–4 ◦C but causes soil degradation and yield losses through residual plastic pollution, and precision irrigation scheduling that partially alleviates salt/drought stress. These measures manage the environment around the seeds but do not enhance the seed’s intrinsic capacity, rendering them vulnerable to climatic unpredictability and input cost inflation. Seed priming serves as an interim tech- nology, rapidly enhancing germination resilience through hydropriming, osmopriming, hormonal priming, or biopriming, yet its pleiotropic risks are underappreciated. Notably, these treatments impose temporary physiological adjustments rather than heritable adapta- tions, raising concerns about potential carryover effects on fiber development, boll retention, and reproductive-stage stress resilience. Furthermore, their efficacy and safety margins dep

  generalfuture work
  Keywords: stress germination cotton drought membrane stage fiber seed antioxidant lipid extremes seedling yield mechanisms global
• Exogenous melatonin induces salt and drought stress tolerance in rice by promoting plant growth and defense system (2024) · Scientific Reports · cited 124× · doi

  Salt and drought stress are major threats to crop yield stability. Climate change exacerbates these stress conditions. There is a need for effective strategies to improve crop yield stability under salt and drought stress conditions.

  generalstated challengesevidence 5/5
  Keywords: salt drought stress major threats crop yield stability
• Selenite alleviates PEG-induced drought stress during rice seed germination through antioxidant regulation and osmotic adjustment (2026) · Plant, Soil and Environment · doi

  The lack of understanding of the physiological mechanisms underlying drought sensitivity during germination. The need to investigate the effects of exogenous Se on PEG-induced osmotic stress during rice seed germination.

  generalstated research gapevidence 5/5
  Keywords: lack understanding physiological mechanisms underlying drought sensitivity during
• Exopolysaccharide is required by Paraburkholderia phytofirmans PsJN to confer drought-stress tolerance in pea (2024) · Frontiers in Microbiology · cited 12× · doi

  Drought is a major environmental stress that affects crop growth and productivity worldwide. Plants are constantly exposed to environmental stresses that limit their productivity. The role of EPS in PsJN to confer drought-stress tolerance in pea is unknown.

  generalstated challengesevidence 5/5
  Keywords: drought major environmental stress affects crop growth productivity
• Nanoclay- and alginate-based soil amendments preserve photosynthetic function, delay senescence, and reduce oxidative damage in drought-stressed wheat (2026) · Frontiers in Plant Science · doi

  Introduction Drought stress accelerates leaf senescence, disrupts photosynthetic function, and enhances oxidative damage in wheat, yet the extent to which soil amendments can mitigate these responses remains insufficiently understood.

  generalabstractevidence 4/5
  Keywords: introduction drought stress accelerates leaf senescence disrupts photosynthetic function enhances oxidative damage wheat extent soil

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