As a step to study the mechanism of the microbody transition (glyoxysomes to leaf peroxisomes) in pumpkin (Cucurbita sp. Amakuri Nankin) cotyledons, catalase was purified from glyoxysomes. The molecular weight of the purified catalase was determined to be 230,000 to 250,000 daltons. The enzyme was judged to consist of four identical pieces of the monomeric subunit with molecular weight of 55,00...

BACKGROUND In a large cropping area of northern Argentina, Sorghum halepense (Johnsongrass) has evolved towards glyphosate resistance. This study aimed to determine the molecular and biochemical basis conferring glyphosate resistance in this species. Experiments were conducted to assess target EPSPS gene sequences and (14)C-glyphosate leaf absorption and translocation to meristematic tissues. ...

The Fig (Ficus carica.L) is a woody perennial crop, cultivated worldwide in subtropical regions. Since, salinity is the main concern of fig industry, therefore, studying the pattern of ion absorption and accumulation contribute during the stress in different plant organs can lead understanding the mechanism of tolerance/sensitivity. So, during 2016-2017, seven fig cultivars (‘Sabzʼ, ‘Siyahʼ, ‘S...

abstract     evapotranspiration and plant water absorption reduce when exposed to water stress and this reduction results in an increase in leaf temperature. to determine the effect of water stress on leaf temperature and timing of irrigation using leaf temperature, a research was conducted on the research and education greenhouse production center of islamic azad university, isfahan branch (kh...

Zinc toxicity and Zn-Fe interactions were studied in corn (Zea mays L. var. Barbecue hybrid) grown in hydroponic culture. High Zn greatly reduced the root and shoot fresh weights; increasing Fe largely, but not completely, restored normal growth. Correlation analyses of root and leaf Zn and Fe contents suggested that Zn may interfere with the translocation of Fe; however, Zn toxicity was not as...

It has been known since Herlitzka's work in 1912 that it is possible to prepare colloidal solutions of chlorophyll by grinding plant tissue. Lubimenko (1927) found that some leaves (Funkia and Aspidistra genuses) gave on extraction with water clear stable green solutions which contained all the chlorophyll of the original leaf in combination with a protein. Other leaves gave extracts which cont...

The net photosynthetic rate, chlorophyll content, chlorophyll fluorescence and 820 nm transmission were investigated to explore the behavior of the photosynthetic apparatus, including light absorption, energy transformation and the photoactivities of photosystem II (PSII) and photosystem I (PSI) during senescence in the stay-green inbred line of maize (Zea mays) Q319 and the quick-leaf-senescen...

Modeling radiative transfer in canopies allows efficient use of remote sensing observations to quantify vegetation state variables and functioning. Canopy radiative transfer models use requires accurate description of leaf optical properties. Although widely used, the PROSPECT leaf optical properties model is based on simplifying assumptions that limit its performances. One of these assumptions...

In the process of photosynthesis as carried out by the higher plants, the leaf absorbs carbon dioxide from the air and transforms it into organic matter. This assimilation of carbon dioxide is accomplished through a number of intermediate steps and anly complete analysis of the mechanism of this process requires that the carboni be traced through these consecutive steps. Obviously the first ste...

The use of spectral response curves for estimating nitrogen (N) leaf concentrations generally has been found to be a challenging task for a variety of plant species. In this investigation, leaf N concentration and corresponding laboratory hyperspectral data were examined for two species of mangrove (Avicennia germinans, Rhizophora mangle) representing a variety of conditions (healthy, poor cond...