Understanding Molecular Mechanisms of Seed Dormancy for Improved Germination in Traditional Leafy Vegetables: An Overview

Sohindji, Fernand S.; Sogbohossou, E. O. Dêêdi; Zohoungbogbo, Herbaud P. F.; Houdegbe, Aristide Carlos; Achigan‐Dako, Enoch G.

doi:10.3390/agronomy10010057

Cited by 22 publications

(25 citation statements)

References 179 publications

(178 reference statements)

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“…Phytohormones were involved in seed germination, particularly gibberellin (GA) and abscisic acid (ABA) [27][28][29], and it was confirmed that the combination of them had antagonistic effects on seed germination [30,31]. Gibberellin, which releases the dormancy of seeds, played a key role in promoting the rupture of testa [32,33].…”

Section: Plant Growth Regulators Regulation On Plant Seed Germinationmentioning

confidence: 94%

Practical Methods for Breaking Seed Dormancy in a Wild Ornamental Tulip Species Tulipa thianschanica Regel

Wei

Zhao

et al. 2020

Agronomy

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The innate physiological dormancy of Tulipa thianschanica seeds ensures its survival and regeneration in the natural environment. However, the low percentage of germination restricts the establishment of its population and commercial breeding. To develop effective ways to break dormancy and improve germination, some important factors of seed germination of T. thianschanica were tested, including temperature, gibberellin (GA3) and/or kinetin (KT), cold stratification and sowing depth. The percentage of germination was as high as 80.7% at a constant temperature of 4 °C, followed by 55.6% at a fluctuating temperature of 4/16 °C, and almost no seeds germinated at 16 °C, 20 °C and 16/20 °C. Treatment with exogenous GA3 significantly improved the germination of seeds, but KT had a slight effect on the germination of T. thianschanica seeds. The combined treatment of GA3 and KT was more effective at enhancing seed germination than any individual treatment, and the optimal hormone concentration for the germination of T. thianschanica seeds was 100 mg/L GA3 + 10 mg/L KT. In addition, it took at least 20 days of cold stratification to break the seed dormancy of T. thianschanica. The emergence of T. thianschanica seedlings was the highest with 82.4% at a sowing depth of 1.5 cm, and it decreased significantly at a depth of >3.0 cm. This study provides information on methods to break dormancy and promote the germination of T. thianschanica seeds.

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Section: Plant Growth Regulators Regulation On Plant Seed Germinationmentioning

confidence: 94%

Practical Methods for Breaking Seed Dormancy in a Wild Ornamental Tulip Species Tulipa thianschanica Regel

Wei

Zhao

et al. 2020

Agronomy

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“…The transition from different phases of germination is closely related to ROS signaling, hormonal and environmental changes including an important role of genes involved in the signaling cascade of ABA: ABI3 (ABA INSENSITIVE 3), ABI5 (ABA INSENSITIVE 5), gibberellins: RGL2 (REPRESSOR OF GA1-3 LIKE 2), and ethylene: EIN2 (ETHYLENE INSENSITIVE 2) [130].…”

Section: Seed Genes To Cope With Abiotic Stressmentioning

confidence: 99%

The Importance of Ion Homeostasis and Nutrient Status in Seed Development and Germination

et al. 2020

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Seed is the dissemination unit of plants initiating an important stage in the life cycle of plants. Seed development, comprising two phases: embryogenesis and seed maturation, may define the quality of sown seed, especially under abiotic stress. In this review we have focused on the recent advances in the molecular mechanisms underlying these complex processes and how they are controlled by distinct environmental factors regulating ion homeostasis into the seed tissues. The role of transporters affecting seed embryogenesis and first stages of germination as imbibition and subsequent radicle protrusion and extension were revised from a molecular point of view. Seed formation depends on the loading of nutrients from the maternal seed coat to the filial endosperm, a process of which the efflux is not clear and where different ions and transporters are involved. The clear interrelation between soil nutrients, presence of heavy metals and the ion capacity of penetration through the seed are discussed in terms of ion effect during different germination stages. Results concerning seed priming techniques used in the improvement of seed vigor and radicle emergence are shown, where the use of nutrients as a novel way of osmopriming to alleviate abiotic stress effects and improve seedlings yield is discussed. Novel approaches to know the re-translocation from source leaves to developing seeds are considered, as an essential mechanism to understand the biofortification process of certain grains in order to cope with nutrient deficiencies, especially in arid and semiarid areas. Finally, the role of new genes involved in hormone-dependent processes, oxidative response and water uptake into the seeds during their development or germination, have been described as plant mechanisms to deal with abiotic stresses.

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“…Since traditional leafy vegetables are an integral part of the African diet, the majority of these leafy vegetables (for example Bidens pilosa, Brassica carinata, Gynandropsis gynandra, Corchorus spp., Launaea taraxacifolia, Talinum triangulare, etc.) are not domesticated yet [27,28]. Some of the traditional leafy vegetables also exhibit seed dormancy.…”

Section: From Exploration To Crop Improvement: the Content And Covera...mentioning

confidence: 99%

“…Therefore, understanding the molecular mechanisms that underpin the seed dormancy is essential for devising a suitable breeding program. In this context, Sohindji and co-workers [28] used Gynandropsis gynandra as a model plant to elucidate the mechanisms of seed dormancy in traditional leafy vegetables and proposed suitable strategies for the molecular breeding of wild leafy vegetables with improved germination.…”

Section: From Exploration To Crop Improvement: the Content And Covera...mentioning

confidence: 99%

The Trilogy of Wild Crops, Traditional Agronomic Practices, and UN-Sustainable Development Goals

et al. 2020

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The world population is projected to become 10 billion by the end of this century. This growing population exerts tremendous pressure on our finite food resources. Unfortunately, the lion-share of the global calorie intake is reliant upon a handful of plant species like rice, wheat, maize, soybean and potato. Therefore, it is the need of the hour to expand our dietary reliance to nutritionally rich but neglected, underutilized and yet-to-be-used wild plants. Many wild plants are also having ethnomedicinal and biocultural significance. Owing to their ecosystem plasticity, they are adapted to diverse habitats including marginal, degraded and other disturbed soil systems. Due to these resilient attributes, they can be considered for large-scale cultivation. However, proper biotechnological interventions are important for (i) removing the negative traits (e.g., low yield, slow growth, antinutritional factors, etc.), (ii) improving the positive traits (e.g., nutritional quality, stress tolerance, etc.), as well as (iii) standardizing the mass multiplication and cultivation strategies of such species for various agro-climatic regions. Besides, learning the biocultural knowledge and traditional cultivation practices employed by the local people is also crucial for their exploitation. The Special Issue “Wild Crop Relatives and Associated Biocultural and Traditional Agronomic Practices for Food and Nutritional Security” was intended to showcase the potential wild crop varieties of nutritional significance and associated biocultural knowledge from the diverse agroecological regions of the world and also to formulate suitable policy frameworks for food and nutritional security. The novel recommendations brought by this Special Issue would serve as a stepping stone for utilizing wild and neglected crops as a supplemental food. Nevertheless, long-term cultivation trials under various agro-climatic conditions are utmost important for unlocking the real potential of these species.

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Understanding Molecular Mechanisms of Seed Dormancy for Improved Germination in Traditional Leafy Vegetables: An Overview

Cited by 22 publications

References 179 publications

Practical Methods for Breaking Seed Dormancy in a Wild Ornamental Tulip Species Tulipa thianschanica Regel

Practical Methods for Breaking Seed Dormancy in a Wild Ornamental Tulip Species Tulipa thianschanica Regel

The Importance of Ion Homeostasis and Nutrient Status in Seed Development and Germination

The Trilogy of Wild Crops, Traditional Agronomic Practices, and UN-Sustainable Development Goals

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