Stomata of corn (Zea mays L.) and sorghum (Sorghum bicolor L.) responded to changes in leaf water potential during the vegetative growth phase. During reproductive growth, leaf resistances were minimal and stomata were no longer sensitive to bulk leaf water status even when leaf water potentials approached -27 bars. Stomata of corn, cotton (Gossypium hirsutum L.), and sorghum appear to respond ...

1. GREGORY, F. G., F. L. MILTHROPE, H. L. PEARSE, and H. J. SPENCER. 1950. Experimental studies of the factors controlling transpiration. II. The relation between transpiration and leaf water content. Jour. Exp. Bot. 1: 15-28. 2. HAFEZ, M. G. A. 1958. Effects of rosemary and thyme oil vapors on the stomata of cherry laurel. Plant Physiol. 33: 181-185. 3. HAFEZ, M. G. A. and M. B. YOUNIS. 1960. ...

In leaves of barley (Hordeum vulgare), as previously found with oats (Avena sativa), a group of six antibiotics that interfere in different ways with the sequence DNA --> mRNA --> protein all delay senescence in the dark, acting to conserve chlorophyll (Chl) and protein and also to open the stomata. Among the active compounds is chloramphenicol, which had previously been reported to act only on...

Although changes in stomatal response to elevated doses of cadmium has already been observed several plants, few studies have focused on this phenomenon more detail. The effects different Cd2+ (50 and 100 mg.kg-1 soil) leaf area characteristics (number stomata, number epidermal cells, index size stomata) faba bean (Vicia L. cultivar Aštar) were studied after 15 days heavy metal treatment. No vi...

The topography and morpho-anatomical characteristics of floral nectaries the chemical analysis nectar have been studied in seven pear cultivars with different susceptibility to Erwinia amylovora. susceptible cultivar Williams, moderately resistant Bella di guigno, Poire de Cure low Alexander Lucas originated from Pyrus communis, while highly Chojuro Nijisseiki P. pyraster Kieffer as interspecie...

Stomata consist of two guard cells around a pore and act as turgor-operated valves for gas exchange. Arabidopsis stomata develop from one or more asymmetric divisions followed by the symmetric division of the guard mother cell. Stomatal number is partly a function of the availability of smaller epidermal cells that are competent to divide asymmetrically. Stomata are spaced apart from each other...

An attempt was made to explain the excessive wilting tendency of 3 tomato mutants, notabilis, flacca, and sitiens. The control varieties in which these mutations were induced are Rheinlands Ruhm for flacca and sitiens and Lukullus for notabilis. Although all 3 mutants are alleles of separated loci, they seem to react similarly to water stress. The mutants wilt faster than the control plants whe...

GPI-anchored proteins (GPI-APs) are essential for plant growth and development; knockout mutations in enzymes responsible for anchor biosynthesis or attachment are gametophyte or embryo lethal. In a genetic screen targeted to identify genes regulating stomata formation, we discovered a missense mutation in the Arabidopsis (Arabidopsis thaliana) homolog of GPI8/PIG-K, a Cys protease that transfe...

Stomatal pores surrounded by a pair of guard cells in the plant epidermis control gas exchange for photosynthesis in response to light, CO(2), and phytohormone abscisic acid. Phototropins (phot1 and phot2) are plant blue-light receptor kinases and mediate stomatal opening via activation of the plasma membrane H(+)-ATPase. However, the signaling mechanism from phototropins to the H(+)-ATPase has...