Meristems in the Movies: Live Imaging as a Tool for Decoding Intercellular Signaling in Shoot Apical Meristems

Tax, Frans E.; Durbak, Amanda

doi:10.1105/tpc.106.042572

Cited by 9 publications

(7 citation statements)

References 52 publications

(52 reference statements)

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“…Another well known hormone which participates in plant growth regulation and development is auxin, acting as a signal for cell division, cell elongation and cell differentiation. Auxin also plays a key role in regulating the leaf primordum at the indeterminate SAM and cell growth in the development of leaves (Kepinski 2006 ; Tax and Durbak 2006 ; Fujino et al 2008 ). In rice, NAL1 and NAL7 encode a putative trypsin-like serine/cysteine protease and a flavin-containing monooxygenase which displays sequence homology with YUCCA, respectively.…”

Section: Discussionmentioning

confidence: 99%

REL2, A Gene Encoding An Unknown Function Protein which Contains DUF630 and DUF632 Domains Controls Leaf Rolling in Rice

Yang

Miao

et al. 2016

Rice

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Section: Discussionmentioning

confidence: 99%

REL2, A Gene Encoding An Unknown Function Protein which Contains DUF630 and DUF632 Domains Controls Leaf Rolling in Rice

Yang

Miao

et al. 2016

Rice

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“…Boundaries of the SAM in buds were defined as done by Schnablová et al. () based on the principal growth directions (anticlinals and periclinals; Kwiatkowska and Nakielski, ), that is, as the apical part of the developing shoot tip above the youngest leaf primordium (e.g., Jacqmard et al., ; Tax and Durbak, ; Barton, , see fig. A, B).…”

Section: Methodsmentioning

confidence: 99%

Disentangling phylogenetic and functional components of shape variation among shoot apical meristems of a wide range of herbaceous angiosperms

Schnablová

Neustupa

Woodard

et al. 2019

American J of Botany

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Premise The shoot apical meristem (SAM) is the basic determinant of plant body organization, but interspecific variation in SAM shape and its relationship to stem and leaf morphological traits is not well known. Here we tested the hypothesis that different SAM shapes are associated with specific shoot traits of the plant body and examined the phylogenetic conservatism of these relationships. Methods We used geometric morphometrics of SAM outlines for a phylogenetically representative set of 110 herbaceous angiosperms and examined their relationship to a number of shoot traits. Results We found large variations in SAM shapes across angiosperm lineages, but covering only a subset of geometrically possible shapes. Part of this variation was allometric (due to SAM size), but the dominant shape variation (dome‐shaped vs. flat surface) was size‐independent and strongly phylogenetically conserved. SAM shapes were largely independent of their cell size and therefore of the number of cells involved. Different patterns in shape variation of outer and inner SAM boundaries were associated with stem thickness, leaf area, and leafiness of the stem. Conclusions The findings show that geometric interdependence of meristem zones gives rise to correlations among organ numbers, sizes, and their proportions. Phylogenetic conservatism in these correlations indicates conservatism in regulatory processes that underlie the correlations, or the individual traits, that give rise to plant architecture.

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“…Plant hormones aVect diverse developmental processes, e.g., seed germination, seed dormancy, and plant architecture. Auxin has been shown to act as a signal for cell division, cell elongation, and cell diVerentiation (reviewed in Kepinski 2006;Tax and Durbak 2006). Auxin critically regulates the leaf primordum at the indeterminate SAM and cell growth in leaf development.…”

Section: Introductionmentioning

confidence: 99%

NARROW LEAF 7 controls leaf shape mediated by auxin in rice

et al. 2008

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Elucidation of the genetic basis of the control of leaf shape could be of use in the manipulation of crop traits, leading to more stable and increased crop production. To improve our understanding of the process controlling leaf shape, we identified a mutant gene in rice that causes a significant decrease in the width of the leaf blade, termed narrow leaf 7 (nal7). This spontaneous mutation of nal7 occurred during the process of developing advanced back-crossed progeny derived from crosses of rice varieties with wild type leaf phenotype. While the mutation resulted in reduced leaf width, no significant morphological changes at the cellular level in leaves were observed, except in bulli-form cells. The NAL7 locus encodes a flavin-containing monooxygenase, which displays sequence homology with YUCCA. Inspection of a structural model of NAL7 suggests that the mutation results in an inactive enzyme. The IAA content in the nal7 mutant was altered compared with that of wild type. The nal7 mutant overexpressing NAL7 cDNA exhibited overgrowth and abnormal morphology of the root, which was likely to be due to auxin overproduction. These results indicate that NAL7 is involved in auxin biosynthesis.

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Meristems in the Movies: Live Imaging as a Tool for Decoding Intercellular Signaling in Shoot Apical Meristems

Cited by 9 publications

References 52 publications

REL2, A Gene Encoding An Unknown Function Protein which Contains DUF630 and DUF632 Domains Controls Leaf Rolling in Rice

REL2, A Gene Encoding An Unknown Function Protein which Contains DUF630 and DUF632 Domains Controls Leaf Rolling in Rice

Disentangling phylogenetic and functional components of shape variation among shoot apical meristems of a wide range of herbaceous angiosperms

NARROW LEAF 7 controls leaf shape mediated by auxin in rice

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