Lateral root initiation and formation within the parental root meristem of Cucurbita pepo: is auxin a key player?

Ilina, Elena L.; Kiryushkin, A. S.; Semenova, Victoria A; Demchenko, N. P.; Pawlowski, Katharina; Demchenko, Kirill N.

doi:10.1093/aob/mcy052

Cited by 21 publications

(46 citation statements)

References 92 publications

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“…Other non-legume species are capable of activating cortical cell divisions, for example during lateral root development, but these do not proceed to form nodule primordia (McCully, 1975). This includes members of the Rosids related to actinorhizal species, e.g., C. pepo (Ilina et al, 2018) as well as legumes (Mathesius et al, 2000b; Herrbach et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

Nodulating Legumes Are Distinguished by a Sensitivity to Cytokinin in the Root Cortex Leading to Pseudonodule Development

2019

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Root nodule symbiosis (RNS) is a feature confined to a single clade of plants, the Fabids. Among Fabids capable of RNS, legumes form root cortex-based nodules in symbioses with rhizobia, while actinorhizal species form lateral root-based nodules with actinomycetes. Cytokinin has previously been shown to be sufficient for “pseudonodule” initiation in model legumes. Here, we tested whether this response correlates with the ability to nodulate across a range of plant species. We analyzed the formation of pseudonodules in 17 nodulating and non-nodulating legume species, and 11 non-legumes, including nodulating actinorhizal species, using light and fluorescence microscopy. Cytokinin-induced pseudonodules arising from cortical cell divisions occurred in all nodulating legume species, but not in any of the other species, including non-nodulating legumes. Pseudonodule formation was dependent on the CRE1 cytokinin receptor in Medicago truncatula. Inhibition of root growth by cytokinin occurred across plant groups, indicating that pseudonodule development is the result of a specific cortical cytokinin response unique to nodulating legumes. Lack of a cortical cytokinin response from the Arabidopsis thaliana cytokinin reporter TCSn::GFP supported this hypothesis. Our results suggest that the ability to form cortical cell-derived nodules was gained in nodulating legumes, and likely lost in non-nodulating legumes, due to a specific root cortical response to cytokinin.

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Section: Discussionmentioning

confidence: 99%

Nodulating Legumes Are Distinguished by a Sensitivity to Cytokinin in the Root Cortex Leading to Pseudonodule Development

2019

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“…This is commonly found in Fabaceae (Popham, 1955; Byrne et al, 1977) and Cucurbitaceae (Van Tieghem and Douliot, 1886; Dubrovsky, 1986a; Demchenko and Demchenko, 2001; Ilina et al, 2018), which form a massive CLS (Figure 4). Interestingly, the cortical and endodermal cells of the same files of the parent root that constitute the developing LRP participate in CLS formation and the cells outside the LRP of the same files do not divide (Dubrovsky, 1986a; Demchenko and Demchenko, 2001; Ilina et al, 2018). This endodermis continuity between the parent and lateral roots is not always maintained, and the CLS on the flanks can be destroyed before LR emergence, as in Z. mays (Clowes, 1978a).…”

Section: Parent Tissues Participating In Primordium Formationmentioning

confidence: 99%

Lateral Root Primordium Morphogenesis in Angiosperms

et al. 2019

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Morphogenetic processes are the basis of new organ formation. Lateral roots (LRs) are the building blocks of the root system. After LR initiation and before LR emergence, a new lateral root primordium (LRP) forms. During this period, the organization and functionality of the prospective LR is defined. Thus, proper LRP morphogenesis is a decisive process during root system formation. Most current studies on LRP morphogenesis have been performed in the model species Arabidopsis thaliana; little is known about this process in other angiosperms. To understand LRP morphogenesis from a wider perspective, we review both contemporary and earlier studies. The latter are largely forgotten, and we attempted to integrate them into present-day research. In particular, we consider in detail the participation of parent root tissue in LRP formation, cell proliferation and timing during LRP morphogenesis, and the hormonal and genetic regulation of LRP morphogenesis. Cell type identity acquisition and new stem cell establishement during LRP morphogenesis are also considered. Within each of these facets, unanswered or poorly understood questions are identified to help define future research in the field. Finally, we discuss emerging research avenues and new technologies that could be used to answer the remaining questions in studies of LRP morphogenesis.

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“…Ilina et al [71] analyzed lateral root initiation and formation within the parental root meristem in Cucurbita pepo. The auxin signaling-responsive promoter DR5 was used to visualise cellular auxin response maxima.…”

Section: Lateral Rootsmentioning

confidence: 99%

The botanical multiverse of Peter Barlow

Chaffey

Volkmann

Baluška

2019

Communicative & Integrative Biology

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Dr Peter Barlow, who died in 2017, was one of the most respected botanists and biologists of the latter half of the 20th Century. His interests covered a wide range of plant biological topics, e.g. root growth and development, plant cytoskeleton, effects of gravity, plant intelligence, pattern formation, and evolution of eukaryotic cells. Here we consider Peter’s numerous contributions to the: elucidation of plant patterns; understanding of root biology; role of the plant cytoskeleton in growth and development; influence of the Moon on terrestrial vegetation; Cell Body concept; and plant neurobiology. In so doing we attempt not only to provide an overview of Peter’s important work in many areas of plant biology, but also to place that work in the context of recent advances in plant and biological sciences.

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Lateral root initiation and formation within the parental root meristem of Cucurbita pepo: is auxin a key player?

Cited by 21 publications

References 92 publications

Nodulating Legumes Are Distinguished by a Sensitivity to Cytokinin in the Root Cortex Leading to Pseudonodule Development

Nodulating Legumes Are Distinguished by a Sensitivity to Cytokinin in the Root Cortex Leading to Pseudonodule Development

Lateral Root Primordium Morphogenesis in Angiosperms

The botanical multiverse of Peter Barlow

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