Effect of Sethoxydim Herbicide in the Leaf Anatomy and Physiology of Brachiaria Grass Under Water Stress

Abstract

Planta Daninha 2017; v35:e017162268 PEREIRA, M.R.R. Effect of sethoxydim herbicide in the leaf anatomy and physiology of brachiaria grass under water stress 1 151103- PD-2016 (9 páginas) PROVA GRÁFICA ). The assessed physiological and anatomicalal parameters were photosynthetic rate, stomatal conductance, transpiration, difference between leaf and room temperature, dry mass of plants, thickness of bulliform cells, adaxial and total epidermis. Under the conditions in which the experiment was conducted, it appears that Brachiaria grass leaves showed uniseriate epidermis, homogenous mesophyll, with radiated distribution of parenchymal cells around the vascular bundles. The adaxial epidermis presented bulliform cells; the vascular bundles are collateral and are present in different sizes. Water stress had a negative influence on herbicide effectiveness and decreased all physiological parameters. The application of the herbicide caused anatomical changes in plants with no water stress (-0.03 MPa), such as limitations in the growth of epidermic and bulliform cells, and in the total leaf thickness. However, in treatments with stress (-0.07 and -1.5 MPa), there were no differences in leaf anatomy, but an increase in the total thickness of leaves, probably as a result of the water stress conditions to which plants were submitted.. 03,5 MPa) Keywords: chemical control, effectiveness, Urochloa decumbens. RESUMO -O objetivo do presente trabalho foi analisar a anatomia foliar e o comportamento fisiológico de plantas de capim-braquiária (Urochloa decumbens) submetidas a diferentes condições hídricas e com a aplicação do herbicida sethoxydim. O delineamento experimental utilizado foi o inteiramente casualizado com quatro repetições, constituído de um fatorial 3 x 2, sendo a combinação de três manejos hídricos

The use of taxonomic studies to the identification of wetlands weeds

“…The study of anatomical characters has much importance in different types of systematic research work. The foliar epidermal studies are essential for delimitation, classification, and for arranging the evolutionary and phylogenetic difficulties which include interrelationship among the plant species (Munir et al, 2011;Pereira et al, 2017;. The foliar epidermal anatomy of plants is valuable in studying systematics and phylogenetic relationships of the taxa and it plays a significant role in the field of cytology (Bunawan et al, 2011;Khan et al, 2017;Lersten, Curtis, 1992).…”

Phytotoxicity and leaf anatomy of young coffee plants subjected to herbicides exclusively and in associations

“…The deleterious effects of the herbicides imazethapyr and sethoxydim are associated with their potential toxic effects, such as the ability to affect the metabolism of sugar, starch, lipids and photosynthesis, thus being able to influence the morphological characteristics of coffee trees (Pereira et al, 2017;Qian et al, 2015;Qian et al, 2013). Protoporphyrinogen oxidase (PPO) inhibiting herbicides contribute to the low translocation of the herbicides to the other parts of the plant (Frihauf;Stahlman;Al-Khatib, 2010;Grossmann et al, 2011) because of the damage caused to the leaf structure in a short period of time.…”