Lake Agmon, a small shallow water body (area 1.1 km2, mean depth <lm) was created in April 1994 as part of the Hula restoration project in the dried peat-soils of the Hula Valley. Until ca. 50 years ago, this area was covered with swamps, extending to the north of Lake Hula. We followed changes over time in the abundance and species composition of the algal populations in Lake Agmon over the initial 4 years that followed its creation, consolidated the existing information on the algal populations of the extinct Lake Hula, and compared the Lake Agmon algal populations with those reported from Lake Hula and with those present in Lake Rinneret. Altogether, 276 algal species were found in Lake Agmon, including 140 chlorophytes, 48 euglenophytes, 34 cyanophytes, 31 diatoms, 8 cryptophytes, 8 dinoflagellates, and 4 chrysophytes. A comprehensive species list for Lake Hula was also compiled, based on the limited published accounts. The similarities between the past and present algal communities in the Hula Valley were great: most diatom, dinoflagellate, chrysophyte, euglenophyte, and large chlorophyte and cyanophyte genera that are seen today in Lake Agmon were also reported from Lake Hula. However, the Hula list of genera was shorter than the Lake Agmon list in some particular categories. The lack of most of the nannoplanktonic Chlorococcales, and all cryptophytes and other small flagellates from the Hula list was attributed to different sampling and preservation methods in the early days; the absence of most filamentous cyanobacteria is considered a real difference, possibly resulting from the more eutrophic status of Lake Agmon. Notably, the dinoflagellate Peridinium gatunense, which blooms annually in Lake Kinneret downstream of the Hula Valley, was not recorded in Lake Hula and did not occur in Lake Agmon.
Utsa Pollingher, Tamar Zohary and Tatiana Fishbein
Harold J. Evans, Günter Eisbrenner, Michael A. Cantrell, Sterling A. Russell and F.J. Hanus
A brief discussion is presented of recent information concerning (a) factors influencing extent of N2, loss during N2 fixation by legumes; (b) electron carriers involved in the oxyhydrogen reaction of Rhizobium japonicum bacteroids; and (c) progress made in evaluating H2 recycling advantages. A major factor determining whether H2 is evolved from legume nodules is the presence of an active uptake hydrogenase which participates in the oxidation of H2 that is evolved as a by-product of the nitrogenase reaction. The extent of H2 evolution from the nitrogenase reaction is affected by those factors that influence the nitrogenase turnover rate. These include the supply of ATP and reductant and the ratio of the Fe protein to the MoFe protein component of nitrogenase. Oxidation of H2 in Rhizobium bacteroids is catalyzed by a series of enzymes located in bacteroid membranes. In addition to the hydrogenase per se, carriers so far shown to be involved in the process include cytochromes of the b and c types and possibly an ubiquinone. Evidence indicating that H2 recycling within N2-fixing organisms leads to physiological benefits that could result in potential increases in legume yields is summarized. Comparisons of Hup* and Hup− wild-type single strains, groups of Hup+ and Hup+ strains and non-revertible Hup− mutants with a Hup+ parent strain as inocula for legumes indicate that the Hup+ characteristic contributes to increased N2 fixation by legumes. We conclude, however, that the most critical evaluation of the direct benefit from H2 recycling to legumes will be derived from experiments in which a Hup+ parent strain, Hup− revertible mutants and Hup+ revertant strains derived from the Hup− mutants are compared as legume inoculants. R. japonicum strains of these types have been developed. The plasmid profiles in wild-type Hup+ and Hup− strains as well as in Hup− mutants and parent strain have been investigated.
Edited by Pieter Baas
Four review papers address (1) the hydraulic architecture of the earliest land plants, (2) the general phenomenon of axial conduit tapering in trees, (3) the hydraulic and biomechanical optimization in one of the most important plantation grown tree species, Norway Spruce, and (4) cellular and subcellular changes in the cambium in response to environmental factors. Three papers review or introduce new tools to observe the 3-D structure and functioning of wood, and novel tools for quantitative image analysis in tree ring series. Finally, five papers report original research on environmental effects on wood structure, including studies on plastic responses in European beech, effects of fire or late summer rains on Mediterranean Aleppo Pine, and the potential for using arctic shrubs or tropical deciduous trees in dendrochronological and climatological studies.
Reprinted from IAWA Journal 34 (4), 2013.
Jitendriya Panigrahi, Saikat Gantait and Illa C. Patel
of simultaneous production of vasicinone from in vitro and in-field plant parts of J. beddomei till date. The present study was conducted for simultaneous quantification of vasicinone production from both in-field and in vitro -grown plant parts of J. beddomei . Materials and methods Collection
J. Efrain Ramirez-Benitez, Ibis Vargas Paredes, Luis F. Cuevas Glory, Enrique Sauri Duch, Victor M. Moo Huchin, Sara Solis Pereira and Gabriel Lizama Uc
. Tsydendambaev et al. (2004) found relatively low content of C < 18 odd-numbered FFA’s in Pinus macrophylla extracts. Other odd-numbered FAs are very rarely found in plants, being present in trace amounts in waxes ( Isbell et al. 1996 ), seed oils ( Hilditch and Williams 1964 ), and phosphatidylserines
Henri N. Le Houérou
Houérou H.N. La végétation de la Tunisie steppique (avec références aux végétations analogues de l'Algérie, de Libye et du Maroc). Ann. Inst. Natl. Rech. Agron. Tunis. 1969 42 5 1 645 Le Houérou H.N. North Africa: present, past, future Arid Lands in Transition. Am. Ass. Adv. Sci., Washington Dregne H
Eli Ashkenazi, Yona Chen and Yoav Avni
of the Negev Highlands indicating the borders of the present study area. Previous research in the region has emphasized the high value of specific geological units, with outcrops creating large, relatively smooth slopes enabling efficient water-runoff values ( Yair 1983 ; Yair and Berkowicz 1989
An Analysis of their Distribution, Biogeography, Diversity and Conservation Status
Aljos Farjon and Denis Filer
An Atlas of the World's Conifers is the first ever atlas of all known conifer species. It is based on locality information of ca. 37,000 collected herbarium specimens held in scientific institutions. As well as providing natural distribution maps for each species, Farjon and Filer give the reader comprehensive insight into the biogeography, diversity and conservation status of conifers on all continents, dispelling the widely held view that they are primarily a northern boreal plant group. Conifer diversity is analysed and presented with a taxonomic and geographic perspective. Distribution patterns are interpreted using the latest information on continental drift, dispersal and phylogeny. The entire dataset supporting the Atlas can be consulted and verified online. These data can also be used for further research and are an invaluable resource for anyone working on conifer systematics, biogeography or conservation.
An Atlas of the World’s Conifers indicates the known distribution of all conifers including an analysis of their biogeography, diversity and conservation status.
Also available from Brill is Aljos Farjon’s A Handbook of the World's Conifers, published in 2010 (ISBN 978 90 04 17718 5) which is a 2017 Choice Magazine "Outstanding Academic Title".
Mast Ram Dhiman, Siddharth Moudgil, Chander Parkash, Raj Kumar, Sandeep Kumar, S.S. Sindhu and Arun Agarwal
In the present investigation a triploid lily species, Lilium lancifolium Thunb. (2n = 3x = 36), possessing several useful genetic characteristics such as profuse growth vigour, more bulbils formation and resistance to Fusarium wilt, was used as maternal parent. While Asiatic hybrid ‘Brunello’ (2n
Yogesh Kumar Tiwari and Sushil Kumar Yadav
which could be grown under relatively warmer environments. The objective of the present investigation was to assess the effect of high temperature stress on anti-oxidative stress metabolism during reproductive stage in maize and also to determine the variability in response in the four genotypes