IX root development, cell divisions at the root tip are predominantly localized in the first few millimeters of the typical dicot seedling root. These divisions give rise to the cells which form the mature root structure. By differential enlargement and maturation processes these cells form the distinctive mature tissue systems of the primary root: the epidermis, cortex, endodermis, pericycle, ...

BACKGROUND AND AIMS Shoot-borne roots contribute to most of the nutrient uptake throughout the life cycle of maize (Zea mays). Compared with numerous studies with embryonic roots, detailed information on the phenotypic plasticity of shoot-borne roots in response to a heterogeneous nitrogen supply is scarce. The present study therefore provides a comprehensive profile of fine-scale plastic respo...

Calamus is a climbing palm marked by considerable internodal extension and limited stem-thickening growth, but with a surprisingly discontinuous axial vascular system. Stem bundles end blindly in a basipetal direction and are connected to each other only by narrow and late-developing transverse commissures. Vascular connection via leaf traces between stem and leaf is made over about nine plasto...

The biological effect of white fluorescent light exposure (emitted from an ordinary 30 Watt, 220V fluorescent bare lamp) on the anatomical architecture of Phaseolus vulgaris L.plants obtained from pre-treated seeds was obtained . Both soaked and dry seed lots were separately exposed to light source for 1, 2, 3 & 4 discontinuous periods of one hour with a break time of a complete hr. between eac...

Genotypic variability in vulnerability of leaf xylem to water-stress-induced cavitation was determined in four sugarcane (Saccharum sp.) clones using detached leaf segments in a hydraulic conductivity apparatus. Vulnerability curves were constructed by plotting the percentage of maximum conductivity versus leaf water potential (psi(I)) and fitting curves using a Weibull function. The psi(I) at ...

First-instar nymphs of periodical cicadas (Homoptera: Cicadidae: Magicicada) were introduced into a 500-cm plot in a relatively pure stand of loblolly pines and into an 1800-cm plot on a mowed grassy lawn to determine whether they could feed on pine and grass roots, respectively. Nymphs and their associated roots were excavated within a 2-year period after introduction. Serial root sections fro...

First-instar nymphs of periodical cicadas (Homoptera: Cicadidae: Magicicada) were introduced into a 500-cm plot in a relatively pure stand of loblolly pines and into an 1800-cm plot on a mowed grassy lawn to determine whether they could feed on pine and grass roots, respectively. Nymphs and their associated roots were excavated within a 2-year period after introduction. Serial root sections fro...

Arabinogalactan-proteins (AGPs) are a family of hydroxy-proline-rich glycoproteins implicated to function in plant growth and development. This report focuses on a novel, modular AGP found in tomato, LeAGP-1, which was predicted by DNA cloning and herein verified at the protein level as a major AGP component. LeAGP-1 was isolated from tomato suspension-cultured cells and verified to be an AGP b...