The role of LAM1 in dorsoventrality and lateral growth of the leaf blade was investigated in the 'bladeless' lam1 mutant of Nicotiana sylvestris and in periclinal chimeras with lam1 and wild-type (N. glauca) cell layers. Mutant lam1 primordia show normal dorsoventrality at emergence, but produce blade tissue that lacks dorsal cell types and fails to expand in the lateral plane. In leaves of a l...

We have isolated an auxin-regulated cDNA, parB, from the early stage of cultured tobacco mesophyll protoplasts. The expression of parB was observed during transition from G0 to the S phase of tobacco mesophyll protoplasts cultured in vitro. The predicted amino acid sequence of parB cDNA has 213 amino acid residues with a relative molecular weight of 23,965. Nucleotide sequence analysis revealed...

The acclimation responses of walnut leaf photosynthesis to the irradiance microclimate were investigated by characterizing the photosynthetic properties of the leaves sampled on young trees (Juglans nigraxregia) grown in simulated sun and shade environments, and within a mature walnut tree crown (Juglans regia) in the field. In the young trees, the CO(2) compensation point in the absence of mit...

Introduction A pathological condition not infrequently observed in leaves of orange trees as yellow, translucent, sunken areas, has been called "mesophyll collapse" by FAWCETT (6). Neither bacteria nor fungi seem to initiate this disorder of the leaves, though they may invade the weakened and collapsed tissues secondarily. The disorder has therefore been regarded as a physiological disturbance ...

Climate changes in Central Asia attract increasing attention to studies successions, ecosystem transformations and plant adaptation. Functional mechanisms of adaptation are related the leaf structure, first all, architecture carbon-assimilating tissues. We studied mesophyll structure Betula platyphylla Sukacz. from geographical regions southern part East Siberia Mongolia with different climate ...

Differentiated leaf cells of gramineous plants, among them the cereals with their immense importance for human nutrition, are considered extremely recalcitrant to, if not incapable of, reentering the cell cycle. This recalcitrance is related to the poor wound response of the monocots-in contrast to most dicots-and the difficulties encountered in monocot tissue culture. We report here the highly...

Mature maize leaf tissue (Zea mays L.) was immunolabeled using a pre-embedding protocol with specific antibodies for nitrate reductase and protein A-colloidal gold. Immunogold label was found exclusively in the cytoplasm of mesophyll cells; no reaction was detected in bundle sheath cells. Chloroplasts, which were sliced open during cryosectioning, had no labeling. Thus, it appears nitrate reduc...

Floral longevity (FL) is an important floral functional trait which critical for flowering plants. FL shows great diversity among angiosperms; however, there limited information on the mechanisms that influence differences in longevity, especially relationship between petal anatomical traits and longevity. We aimed to examine (1) relationships tree peony cultivars (2) characteristics of longer ...