Seed Germination, Seed Banks, and Reproductive Eco-physiology of Halophytes

Soil salinity hinders plant growth, causing ionic imbalance and osmotic stress, especially during seed germination. While studies on salt tolerance in vegetative growth are abundant, understanding salt stress mechanisms in germination remains limited. Halophytes, equipped with efficient salt-tolerance mechanisms, thrive in saline soils, demonstrating superior reproductive biology. Because of osmolyte buildup, ideal hormonal composition, and seed polymorphism, seeds harvested in saline environments have higher salt tolerance. Salinity has a beneficial effect on the reproductive growth of halophytes, increasing seed output, late flowering, flower count, and pollen viability. This improvement results from optimal nutrition, altered hormonal status, and regulated flowering genes. Identifying key genes in halophyte reproductive physiology for crop transformation holds promise for saline agriculture. Seed heteromorphism, reflecting morphological, dormancy, germination, and salt tolerance differences, provides opportunities for diverse crop improvements. The present understanding of important halophyte reproductive biology topics, including blooming time regulation, hormone regulation, pollen and another development, early germination, carbohydrate status, seed formation, seed bank, and seed polymorphism, is compiled in this review. This chapter explores the effects of salinity on halophyte delayed flowering, hormone roles, flower biology, flower germination, flowering, anther and pollen viability, flower biology, carbohydrate supply, seed heteromorphism, and survival strategies for annuals and perennials. With implications for ecological and agricultural practices, understanding these complexities provides extensive knowledge of how halophytes cope with soil salinity challenges during reproduction.