morphological features of aquatic plants

December 8, 2020

A macrophyte is a plant that grows in or near water and is either emergent, submergent, or floating. Unlike all of the case studies discussed above, this life-history transition tends to increase rather than decrease overall morphological complexity (Figs. Sakai, A. Additionally, a cytosol-localized malate dehydrogenase (CMDH4) protein has also been identified for its active participation in the regulation of Pb tolerance mechanisms (Yang et al., 2016b). Aquatic plants anchored in streams are under pressure from various constraints linked to the water flow and display strategies to prevent their damage or destruction. Differences are seen in rootability and flowering and can be seen in the same mature tree. Studies also have indicated that besides visual and gustatory cues, olfactory cues are associated with aphid preference and/or settling. Although these definitions would appear to be more-or-less synonymous, in current zoological usage they connote somewhat different things, the sense of which is hinted at in the etymology. The genetic modification or insertion of genes is related to the modification of plant morphology. ROSs increase in response to UV-B, as well as salicyclic acid and jasmonic acid, which may all affect the production of secondary metabolites. The prolonged arrestment of aphids on PLRV-infected plants may provide aphids with a longer acquisition access period, which in turn may aid in successful acquisition and inoculation of the virus. Research conducted on vector behavior as influenced by non-persistent viruses in the potato system and in other systems indicates that virus-infected plants may be arresting aphids for a short period of time to facilitate their spread (Mauck et al. The morphological characteristics of lucerne plants associated with grazing aptitude were studied. Flowering close to the base of a tree is absent or less profuse than flowering in the higher branches especially when a young tree first reaches flowering age. Electrical penetration graph (EPG) studies have shed more light on the effect of non-persistent virus infection on feeding behavior of colonizing and non-colonizing aphids. Hydrophytes have a waterproof and protective waxy coat on its surface which prevents them from decaying. 20(3):91–97. ), Sattler, R. 2019. ROS further activated plant signaling mechanisms and influenced the expression of antioxidative genes such as CuZn-SOD, GSH synthase (GS), GPX and that was accompanied by considerable changes in plant response to Pb stress. High-resolution AMS 14C dates around tephra horizons will establish these as time markers wherever the tephras are found, especially in marine cores. Such investigations are essential to assess their current status and to predict possible successional changes in aquatic plant communities (Schutten & Davy, 2000). At this scale, plant morphology overlaps with plant anatomy as a field of study. Elucidation of such rules was the goal of Geoffroy Saint-Hilaire (1818; in Russell, 1916) and the “transcendental” morphologists, and explored by Owen (e.g., 1848, 1849) in the context of “archetypes.” However, this fundamental interest in morphological rules of transformation is clearly evident in the modern structuralist movement (see Piaget, 1970; Rieppel, 1990), which, although it takes many forms, has at its core the notion that phenotypic hierarchies manifest emergent properties that certainly influence, if not dictate, directions of further phenotypic evolution (e.g., Russell, 1916; Whyte, 1965; Dullemeijer, 1974, 1980; Riedl, 1978; Lauder, 1982a; Ho and Saunders, 1979, 1984; Roth and Wake, 1985; Rieppel, 1986; Wagner, 1986; Wake and Larson, 1987; Wake and Roth, 1989; D. Wake, 1991; Smith, 1992; van der Weele, 1993; Schwenk, 1995, 2000; Amundson, 1996; Hall, 1996, 1998; Raff, 1996; Webster and Goodwin, 1996; Arthur, 1997; Wagner and Schwenk, 1999; Schwenk and Wagner, in preparation). By contrast, plants constantly produce new tissues and structures throughout their life from meristems[5] located at the tips of organs, or between mature tissues. Several species of seagrass are … (Fig. [18], Rolf Sattler has revised fundamental concepts of comparative morphology such as the concept of homology. The identification of the genes responsible for plant dwarfing, related to plant response to gibberellin, or affecting the formation of tillers and lateral branches carrying inflorescences has opened promising ways for yield improvement (Takeda et al., 2003; Sakamoto and Matsuoka, 2004). Likewise, no correlation between the nutrient status of the plants and … They seek instead a “rational,” predictive science of form based on rules of self-organization and organismal development (e.g., Ho and Saunders, 1979, 1984; Goodwin, 1989; Webster and Goodwin, 1996). Classification of plants based on water relation (Warming, 1990) (1). More modern representation studies are needed from all types of ecosystems, to aid in the interpretation of past macrofossil records. We assume that the responses of aquatic plants to fast-water flow are a manifestation of a trade-off consisting in either maximizing the resistance to … The detailed study of reproductive structures in plants led to the discovery of the alternation of generations, found in all plants and most algae, by the German botanist Wilhelm Hofmeister. The fecundity of M. persicae was greater on PVY-infected plants than on non-infected potato plants. Plant morphology can be an effective means by which plants influence and increase the microhabitat temperatures within which their tissues exist. This study evaluated photosynthesis in aquatic roots … Morphology “deals with the form of living organisms, and with relationships between their structures” (from the Greek stem morpho), whereas anatomy is “the science of the structure of the bodies of humans, animals, and plants” (derived from the Greek stems ana- and -tomy, meaning “repeated cutting”) (Oxford English Dictionary; Brown, 1993). In addition to its effects on secondary metabolites that are involved in UV shielding and stress protection, UV radiation also elicits increased accumulation of secondary metabolites that are involved in the defense against herbivores and pathogens. They have extensive air-spaces in their leaves, stems and roots. Acquisition and inoculation of a non-persistent virus are associated with subphases II-1 and II-3, respectively, of the potential drop that occurs during a stylet cell puncture (Powell et al. He emphasized that homology should also include partial homology and quantitative homology. Apart from the aforementioned hydropteridalean ferns (Raubeson et al. Volume 1. [33], Vegetative and reproductive characteristics. Apart from PDR12, a number of other transporter proteins such as ABC transporter of the mitochondria 3 (ATM3) (Kim et al., 2006; Jiang et al., 2017), acyl-CoA-binding protein (Xiao et al., 2008), and leucine-rich repeat2 (LRR2) (Zhu et al., 2013) have also been identified that contribute to Pb resistance by regulating the Pb transportation to the exterior of the cell. In contrast, M. persicae, the most efficient vector of PVY, started probing sooner on PVY-infected plants than on healthy plants. 2009). In fact, it is simply the timing of the KNOX gene expression!. For example, along a new branch the leaves may vary in a consistent pattern along the branch. A living plant always has embryonic tissues. In contrast, mutant lines with loss of PSE1 function showed enhanced sensitivity towards Pb stress. Anatomical features. From: Reference Module in Earth Systems and Environmental Sciences, 2019, Grazia M. Borrelli, ... Luigi Cattivelli, in Crop Physiology, 2009. At the largest scale is the study of plant growth habit, the overall architecture of a plant. Although aerial and rhizome production were stimulated by increased N supply, total root production did not differ significantly between treatments (Morris, 1982). Positive correlations between ecological shifts and parallel radical changes in phenotype. This discovery is one of the most important made in all of plant morphology, since it provides a common basis for understanding the life cycle of all plants. Mesophytes: plants … An increased expression of ATM3 in wild-type plant increased the tolerance to Pb stress and plants overexpressing ATM3 also showed resistance to Pb-induced oxidative stress, which was different from the wild-type plant (Kim et al., 2006). Morphology is the study of “form,” which can be generalized to all hierarchical levels, from organelle to whole organism. 1998, Srinivasan et al. This phenomenon is known as juvenility or heteroblasty. [30], Classical morphology, continuum morphology, and process morphology are highly relevant to plant evolution, especially the field of plant evolutionary biology (plant evo-devo) that tries to integrate plant morphology and plant molecular genetics. 1987. [21] A recent study conducted by Stalk Institute extracted coordinates corresponding to each plant's base and leaves in 3D space. Abhay Kumar, Majeti Narasimha Vara Prasad, in Transgenic Plant Technology for Remediation of Toxic Metals and Metalloids, 2019. Similar arguments can be made for iterative origins of tropical mangrove trees and of annual from perennial life histories among angiosperms. 1994) have identified approximately seven independent evolutionary origins of carnivory; some encompass only one mode of insect capture, but three modes occur in different members of the Droseraceae. Increasing UV-B exposure in field-grown plants not only increased the total essential oil and phenolics content but also decreased the amount of the possibly toxic beta-asarone (Kumari et al., 2009). Indeed, radical “process structuralists” (see Smith, 1992) go so far as to suggest that random variation, natural selection, and phylogenetic history (the tenets of Darwinism) are secondary players in the generation of hierarchically organized phenotypic diversity. The vegetative (somatic) structures of vascular plants include two major organ systems: (1) a shoot system, composed of stems and leaves, and (2) a root system. [17], The transition from early to late growth forms is referred to as 'vegetative phase change', As in the case of behavior, the effects induced by a persistent virus seem to positively influence the fitness of colonizing aphids. Other than known antioxidative genes or proteins, an unknown protein, encoded by PSE1 (Pb-sensitive1) gene, with an NC domain and that was localized in cytoplasm showed potential for Pb tolerance in A. thaliana since its expression increased during Pb stress (Fan et al., 2016). Individual plants appear to compete for surface space with their nearest neighbors (Clat-worthy and Harper, 1962). but there is some disagreement about terminology. In a multiproxy study, they provide an essential record of vegetation development either in a mire or bog, or in a lake ecosystem (lake plus its catchment). When water freezes in plants, the consequences for the plant depend very much on whether the freezing occurs intracellularly (within cells) or outside cells in intercellular (extracellular) spaces.

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