Role of indehiscent pericarp in formation of soil seed bank in five cold desert Brassicaceae species

Lu, Juan; Tan, Dunyan; Baskin, Carol C.; Baskin, Jerry M.

doi:10.1007/s11258-017-0760-8

Cited by 14 publications

(14 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…First, inherent dormancy resides within the embryo and/or the surrounding structures, such as the seed cotyledon, endosperm and seed coat, in which the balance among abscisic acid, gibberellins and ethylene controls seed dormancy and germination [8–11]. Second, seed appendage-imposed dormancy is conferred by the biomechanical mechanism [7, 12, 13]. Most studies in seed accompany structures focus on the mechanical inhibition in germination [13–15] and the benefits in seed dispersal [14, 15].…”

Section: Introductionmentioning

confidence: 99%

“…Second, seed appendage-imposed dormancy is conferred by the biomechanical mechanism [7, 12, 13]. Most studies in seed accompany structures focus on the mechanical inhibition in germination [13–15] and the benefits in seed dispersal [14, 15]. However, as ecologists noted, physiological dormancy is the most common type in the seven major dormancy classes [16, 17].…”

Section: Introductionmentioning

confidence: 99%

“…As Koller [18] and Baskin and Baskin [16] suggested, the germination ecology of a species cannot be understood unless intact natural dispersal units (seed or fruit, or with accessory parts) are considered. Embryo covering layers such as the seed coat and/or an indehiscent appendage creates mechanical resistance to seed germination [12, 13, 19] and shifts the duration of soil seedbank [13]. This information is a vital gap because the diversity of morphological and biomechanical inherent structures within seeds/fruits is the result of different strategies for successful dispersal and appropriate germination [20–23].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

RETRACTED ARTICLE: The role of seed appendage in improving the adaptation of a species in definite seasons: a case study of Atriplex centralasiatica

et al. 2019

View full text Add to dashboard Cite

BackgroundAs a common accompanying dispersal structure, specialized seed appendages play a critical role in the successful germination and dispersal of many plants, and are regarded as an adaptation character for plants survival in diverse environments. However, little is known about how the appendages modulate the linkage between germination and environmental factors. Here, we tested the responses of germination to seasonal environmental signals (temperature and humidity) via seed appendages using Atriplex centralasiatica, which is widely distributed in salt marshlands with dry-cold winter in northern China. Three types of heteromorphic diaspores that differ in morphology of persistent bracteole and dormancy levels are produced in an individual plant of A. centralasiatica.ResultsExcept for the nondormant diaspore (type A, with a brown seed enclosed in a persistent bracteole), bracteoles regulated inner seed dormancy of the other two dormant diaspore types, i.e., type B (flat diaspore with a black inner seed) and type C (globular diaspore with a black inner seed). For types B and C, germination of bracteole-free seeds was higher than that of intact diaspores, and was limited severely when incubated in the bracteole-soaking solution. Dormancy was released at a low temperature (< 10 °C) and suitable humidity (5–15%) condition. Oppositely, high temperature and unfit humidity induced secondary dormancy via inhibitors released by bracteoles. Type C with deeper dormancy needed more stringent conditions for dormancy release and was easier for dormancy inducement than type B. The germination windows were broadened and the time needed for dormancy release decreased after the bracteole flushing for the two dormant types in the field condition.ConclusionsBracteoles determine the germination adaptation by bridging seeds and environmental signals and promising seedlings establishment only in proper seasons, which may also restrict species geographical distribution and shift species distributing ranges under the global climate change scenarios.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

RETRACTED ARTICLE: The role of seed appendage in improving the adaptation of a species in definite seasons: a case study of Atriplex centralasiatica

et al. 2019

View full text Add to dashboard Cite

show abstract

“…If the soil is too dry for seeds to germinate in autumn, germination is delayed until spring, at which time the soil is moist due to rain and/or meltwater from snow ( Wang et al 2006 ), and seeds germinate and plants behave as ephemerals ( Lu et al 2014 ). In years with a reasonable amount of rainfall in autumn, a portion of the seed population of an annual species germinates in autumn and another portion in spring ( Lu et al 2014 , 2017 ), i.e. the species behaves as a facultative winter annual.…”

Section: Introductionmentioning

confidence: 99%

Dormancy and germination of the trimorphic achenes of a cold desert annual: spreading the risk over time

Dong

Tan

et al. 2020

AoB PLANTS

View full text Add to dashboard Cite

Many studies have been done on the relationship between variation in morphology, degree of dormancy and dispersal ability of heterocarpic species with dimorphic diaspores. However, there are far fewer such studies on species that produce trimorphic diaspores. Our aim was to compare dormancy and germination of achenes from peripheral, intermediate and central positions in the capitulum of the diaspore-trimorphic cold desert annual Asteraceae species Heteracia szovitsii, an important component of plant communities in the cold deserts of NW China. Dormancy breaking/germination responses of the three achene morphs and of seeds isolated from the pericarp were tested in the laboratory using standard procedures, and seedling emergence phenology of the achene morphs was monitored under natural cold desert temperature conditions in an experimental garden with and without supplemental watering. Depth of dormancy of the three achene morphs was peripheral > intermediate > central. Seedlings from the three morphs emerged in spring and in autumn. Cumulative seedling emergence percentage from achenes during 47 months of burial was central > intermediate > peripheral. Central achene morphs emerged over a period of about 12 months after sowing, while intermediate and peripheral achene morphs did so for about 40 and 47 months, respectively. Thus, H. szovitsii exhibits a temporal dispersal strategy. No viable central or intermediate achene morphs were present after 16 and 40 months, respectively, but about 60 % of the nonemerged peripheral achenes morphs were viable after 47 months. Based on our results on diaspore dormancy and those of a previous study of diaspore spatial dispersal of H. szovitsii, we conclude that this species has a high-intermediate-low risk diaspore dispersal/dormancy strategy that likely increases the chances for population persistence over time and space.

show abstract

“…For instance, the pericarps of pea ( Pisum sativum ) possess nutritional and antioxidant compounds that were further enhanced by plant growth promoting microbes [ 12 ]. Several reports demonstrated the positive effect of the intact dispersal units on seed longevity and seedling establishment when compared to naked seeds [ 13 , 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

The Dead Can Nurture: Novel Insights into the Function of Dead Organs Enclosing Embryos

Raviv

Godwin

Granot

et al. 2018

IJMS

View full text Add to dashboard Cite

Plants have evolved a variety of dispersal units whereby the embryo is enclosed by various dead protective layers derived from maternal organs of the reproductive system including seed coats (integuments), pericarps (ovary wall, e.g., indehiscent dry fruits) as well as floral bracts (e.g., glumes) in grasses. Commonly, dead organs enclosing embryos (DOEEs) are assumed to provide a physical shield for embryo protection and means for dispersal in the ecosystem. In this review article, we highlight recent studies showing that DOEEs of various species across families also have the capability for long-term storage of various substances including active proteins (hydrolases and ROS detoxifying enzymes), nutrients and metabolites that have the potential to support the embryo during storage in the soil and assist in germination and seedling establishment. We discuss a possible role for DOEEs as natural coatings capable of “engineering” the seed microenvironment for the benefit of the embryo, the seedling and the growing plant.

show abstract

Role of indehiscent pericarp in formation of soil seed bank in five cold desert Brassicaceae species

Cited by 14 publications

References 22 publications

RETRACTED ARTICLE: The role of seed appendage in improving the adaptation of a species in definite seasons: a case study of Atriplex centralasiatica

RETRACTED ARTICLE: The role of seed appendage in improving the adaptation of a species in definite seasons: a case study of Atriplex centralasiatica

Dormancy and germination of the trimorphic achenes of a cold desert annual: spreading the risk over time

The Dead Can Nurture: Novel Insights into the Function of Dead Organs Enclosing Embryos

Contact Info

Product

Resources

About