Diaspore dispersal ability and degree of dormancy in heteromorphic species of cold deserts of northwest China: A review

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

doi:10.1016/j.ppees.2014.02.004

Cited by 57 publications

(74 citation statements)

References 70 publications

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“…For sessile plants, a well-synchronized mechanism is required to defend themselves and their progeny (i.e., seeds) from natural antagonists throughout their life cycle. Several angiosperm families independently evolved heteromorphism as an adaptive life strategy, characterized by the production of two or more distinct fruit and seed morphs on individual plants, which differ in size, shape, colour, dispersal mechanism, dormancy, germination, and mucilage production (Baskin, Lu, Baskin, Tan, & Wang, 2014;Imbert, 2002;Lenser et al, 2016;Willis, Hall, Rubio de Casas, Wang, & Donohue, 2014). The existence of different fruit or seed morphs with distinct properties strategically provides high flexibility and a fitness advantage in terms of propagation (Evans & Dennehy, 2005;Philippi & Seger, 1989;Venable, 1985).…”

Section: Introductionmentioning

confidence: 99%

Two‐tier morpho‐chemical defence tactic inAethionemavia fruit morph plasticity and glucosinolates allocation in diaspores

Bhattacharya

Mayland-Quellhorst

Müller

et al. 2018

Plant Cell & Environment

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Fruit dimorphism and the production of glucosinolates (GSLs) are two specific life history traits found in the members of Brassicales, which aid to optimize seed dispersal and defence against antagonists, respectively. We hypothesized that the bipartite dispersal strategy demands a tight control over the production of fruit morphs with expectedly differential allocation of defensive anticipins (GSLs). In dimorphic Aethionema, herbivory by Plutella xylostella at a young stage triggered the production of more dehiscent (seeds released from fruit) than indehiscent fruit morphs (seeds enclosed within persistent pericarp) on the same plant upon maturity. Total GSL concentrations were highest in the mature seeds of dehiscent fruits from Aethionema arabicum and Aethionema saxatile among the different ontogenetic stages of the diaspores. Multivariate analyses of GSL profiles indicated significantly higher concentrations of specific indole GSLs in the diaspores, which require optimal defence after dispersal (i.e., seeds of dehiscent and fruit/pericarp of indehiscent fruit). Bioassays with a potentially coinhabitant fungus, Aspergillus quadrilineatus, support the distinct defensive potential of the diaspores corresponding to their GSL allocation. These findings indicate a two‐tier morpho‐chemical defence tactic of Aethionema via better protected fruit morphs and strategic provision of GSLs that optimize protection to the progeny for survival in nature.

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Section: Introductionmentioning

confidence: 99%

Two‐tier morpho‐chemical defence tactic inAethionemavia fruit morph plasticity and glucosinolates allocation in diaspores

Bhattacharya

Mayland-Quellhorst

Müller

et al. 2018

Plant Cell & Environment

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“…These differ in various properties, including fruit and seed size, shape, color, mechanisms of dispersal, dormancy, germination, and mucilage production upon imbibition (Takeno and Yamaguchi, 1991;Mandak and Pysek, 2001;Lu et al, 2010;Dubois and Cheptou, 2012;Baskin et al, 2014;Yang et al, 2015, and refs. therein).…”

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confidence: 99%

Developmental Control and Plasticity of Fruit and Seed Dimorphism in Aethionema arabicum

et al. 2016

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Understanding how plants cope with changing habitats is a timely and important topic in plant research. Phenotypic plasticity describes the capability of a genotype to produce different phenotypes when exposed to different environmental conditions. In contrast, the constant production of a set of distinct phenotypes by one genotype mediates bet hedging, a strategy that reduces the temporal variance in fitness at the expense of a lowered arithmetic mean fitness. Both phenomena are thought to represent important adaptation strategies to unstable environments. However, little is known about the underlying mechanisms of these phenomena, partly due to the lack of suitable model systems. We used phylogenetic and comparative analyses of fruit and seed anatomy, biomechanics, physiology, and environmental responses to study fruit and seed heteromorphism, a typical morphological basis of a bet-hedging strategy of plants, in the annual Brassicaceae species Aethionema arabicum. Our results indicate that heteromorphism evolved twice within the Aethionemeae, including once for the monophyletic annual Aethionema clade. The dimorphism of Ae. arabicum is associated with several anatomic, biomechanical, gene expression, and physiological differences between the fruit and seed morphs. However, fruit ratios and numbers change in response to different environmental conditions. Therefore, the life-history strategy of Ae. arabicum appears to be a blend of bet hedging and plasticity. Together with the available genomic resources, our results pave the way to use this species in future studies intended to unravel the molecular control of heteromorphism and plasticity.

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“…Seed mass variation is a type of heteromorphism, which represents a classic trade-off. Production of dimorphic or heteromorphic seeds by a single plant allows plants to decrease temporal variance in offspring success through bet-hedging [i.e., a strategy that reduced temporal variance in fitness at the expense of a lowered arithmetic mean fitness] [33][34][35], or rather, a blend of plasticity [i.e., a capacity of a genotype to produce different phenotypes when exposed to different…”

Section: Seed Sizementioning

confidence: 99%

Roles of the Environment in Plant Life-History Trade-offs

Liu¹,

Walck²,

El‐Kassaby³

2017

Advances in Seed Biology

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Variation in plant life-history and functional traits at between-and within-species levels has key ecological consequences, in which environmental settings impose strong selective pressures and play a vital role throughout life cycles. Our general notion for plant life-history strategies may be that, relative to tall, long-lived plants, short-lived species have features of small stature, small-seededness, rapid growth, and low seedling survival (k-versus r-selection). Rate of evolution may be an important agent of selection and annals evolve more rapidly than perennial congeners. These empirical observations prompt a suite of enticing questions, such as how do life-history traits interplay with functional trait at late stages of regeneration? what are the primary trade-offs in a cohort of key life-history traits that may have undergone stabilizing selection? and how do environmental filters differently affect adaptive trait variation in annuals and perennials? In this chapter, we intend to address aforementioned questions via assembling our updated knowledge with emphasis on seed mass and temporal and spatial dimensions of seed dispersal. Through such synthesis, we wish to raise awareness about life-history trade-offs and provide a holistic understanding of the extent to which climate change is likely to impact plant adaptation and eco-evolutionary trajectories of life-history phenotypes.

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Diaspore dispersal ability and degree of dormancy in heteromorphic species of cold deserts of northwest China: A review

Cited by 57 publications

References 70 publications

Two‐tier morpho‐chemical defence tactic inAethionemavia fruit morph plasticity and glucosinolates allocation in diaspores

Two‐tier morpho‐chemical defence tactic inAethionemavia fruit morph plasticity and glucosinolates allocation in diaspores

Developmental Control and Plasticity of Fruit and Seed Dimorphism in Aethionema arabicum

Roles of the Environment in Plant Life-History Trade-offs

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