The hierarchy of chirality

Schulgasser, K.; Witztum, A.

doi:10.1016/j.jtbi.2004.05.012

Cited by 30 publications

(21 citation statements)

References 10 publications

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“…Helical growth in Arabidopsis was originally considered a phenomenon expressed only by whole organs (Furutani et al, 2000), but the tor2 phenotype and theoretical models suggest that in at least some helical growth mutants, the actual basis of helical growth may be the single cell (Schulgasser and Witztum, 2004;Buschmann et al, 2009;Eren et al, 2010;Wada, 2012). In this article, we show that even growing wild-type Arabidopsis trichome cells show helical microtubule arrays of consistent handedness ( Figure 2C).…”

Section: A Hidden Handedness In Arabidopsis Trichomessupporting

confidence: 51%

Actin-Dependent and -Independent Functions of Cortical Microtubules in the Differentiation ofArabidopsisLeaf Trichomes

et al. 2014

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Arabidopsis thaliana tortifolía2 carries a point mutation in a-tubulin 4 and shows aberrant cortical microtubule dynamics. The microtubule defect of tortifolia2 leads to overbranching and right-handed helical growth in the single-celled leaf trichomes. Here, we use tortifolia2 to further our understanding of microtubules in plant cell differentiation. Trichomes at the branching stage show an apical ring of cortical microtubules, and our analyses support that this ring is involved in marking the prospective branch site. tortifolia2 showed ectopic microtubule bundles at this stage, consistent with a function for microtubules in selecting new branch sites. Overbranching of tortifolia2 required the C-terminal binding protein/brefeldin A-ADP ribosylated substrate protein ANGUSTIFOLIA1, and our results indicate that the angustifolia1 mutant is hypersensitive to alterations in microtubule dynamics. To analyze whether actin and microtubules cooperate in the trichome cell expansion process, we generated double mutants of tortifolia2 with distorted1, a mutant that is defective in the actin-related ARP2/3 complex. The double mutant trichomes showed a complete loss of growth anisotropy, suggesting a genetic interaction of actin and microtubules. Green fluorescent protein labeling of F-actin or microtubules in tortifolia2 distorted1 double mutants indicated that F-actin enhances microtubule dynamics and enables reorientation. Together, our results suggest actin-dependent and -independent functions of cortical microtubules in trichome differentiation.

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Section: A Hidden Handedness In Arabidopsis Trichomessupporting

confidence: 51%

Actin-Dependent and -Independent Functions of Cortical Microtubules in the Differentiation ofArabidopsisLeaf Trichomes

et al. 2014

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“…1J) (Schulgasser and Witztum, 2004b), Persoonia (right-handed; Fig. 1L), and in leaves of the rosette species Chamaescilla spiralis, Asparagaceae (lefthanded; Fig.…”

Section: Flat Organsmentioning

confidence: 99%

Helical growth in plant organs: mechanisms and significance

Smyth

2016

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Many plants show some form of helical growth, such as the circular searching movements of growing stems and other organs (circumnutation), tendril coiling, leaf and bud reversal (resupination), petal arrangement (contortion) and leaf blade twisting. Recent genetic findings have revealed that such helical growth may be associated with helical arrays of cortical microtubules and of overlying cellulose microfibrils. An alternative mechanism of coiling that is based on differential contraction within a bilayer has also recently been identified and underlies at least some of these growth patterns. Here, I provide an overview of the genes and cellular processes that underlie helical patterning. I also discuss the diversity of helical growth patterns in plants, highlighting their potential adaptive significance and comparing them with helical growth patterns in animals.

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“…And chirality is one of the essential attributes of the nature (Schulgasser et al, 2004). A chiral molecule is a type of molecule that lacks an internal plane of symmetry and thus has a non-superposable mirror image.…”

Section: Chirality Of Pyrethroid Pesticidesmentioning

confidence: 99%