scholarly journals Physiological and Morphological Responses of Hydroponically Grown Pear Rootstock Under Phosphorus Treatment

2021 ◽  
Vol 12 ◽  
Author(s):  
Guodong Chen ◽  
Yang Li ◽  
Cong Jin ◽  
Jizhong Wang ◽  
Li Wang ◽  
...  
Keyword(s):  
Photosynthetic Rate ◽  
Growth And Development ◽  
Growth Parameters ◽  
Normal Growth ◽  
Fruit Trees ◽  
Acid Synthesis ◽  
P Deficiency ◽  
P Fertilizer ◽  
Dark Green ◽  
Hydroponically Grown

Phosphorus (P) is an essential macronutrient for the growth and development of fruit trees, playing an important role in photosynthesis, nucleic acid synthesis, and enzyme activity regulation. The plasticity of plant phenotypic has been investigated in diverse species under conditions of P-deficiency or P-excess. Based on these researches, P level fluctuations in different species result in different characteristics of the response. Nevertheless, little is known about the response of pear seedling rootstock (Pyrus betulifolia Bunge) to the changing of P levels. To explore the effects of different levels of P on the growth of pear seedling rootstock, we performed the hydroponic assays to determine and analyze the biological indexes including growth parameters, photosynthetic rate, root and shoot morphological traits, and concentrations of macro- and micronutrients. The results show that either deficiency or excess of P inhibited the growth and development of pear seedling rootstock. Root growth (down 44.8%), photosynthetic rate (down 59.8%), and acid phosphatase (ACP) activity (down 44.4%) were inhibited under the P-deficiency conditions (0mM), compared with normal P conditions (1mM). On the other hand, dark green leaves, suppression of root elongation (down 18.8%), and photosynthetic rate (down 25%) were observed under regimes of excessive P, compared with normal P conditions (1mM). Furthermore, the root concentration of not only P, but also those of other mineral nutrients were affected by either P treatment. In brief, these results indicated that a careful choice of P fertilizer supply is crucial to ensuring normal growth and development of pear seedling rootstock.

Control of morphogenesis in the ethylene-requiring tomato mutant, diageotropica

1974 ◽  
Vol 52 (4) ◽  
pp. 735-741 ◽  
Author(s):  
R. W. Zobel
Keyword(s):  
Growth And Development ◽  
Single Gene ◽  
Normal Growth ◽  
Root Culture ◽  
Plant Morphology ◽  
Feedback Mechanism ◽  
Root Initiation ◽  
Low Concentrations ◽  
Endogenous Ethylene ◽  
Dark Green

Diageotropica (dgt) is a single gene mutant of tomato which requires extremely low concentrations of ethylene for normal growth and development. The morphology of the mutant is charactertized by diageotropic growth of both shoots and roots, thin stems without large secondary xylem vessels but with abnormally thick phloem fibers, dark green hyponastic leaf segments, primary and adventitious roots without lateral branching, and an open hypocotyl hook. Studies with the mutant indicate that plant morphology may be at least partly controlled developmentally by an endogenous ethylene–auxin feedback mechanism. The mutant's requirement for ethylene concentrations in the range of 0.005 μl/liter or less implies that higher concentrations may be supraoptimal in studies dealing with ethylene effects on plant growth and development in tomato. Results of grafting and excised root culture experiments combined with results of ethylene treatments indicate that a polarly transported substance, which controls lateral root initiation but not adventitious root initiation, is produced in the shoot in response to ethylene and transported to the roots. The dgt mutant should prove useful in investigations of ethylene and auxin control of morphogenesis.

scholarly journals EFFECT OF MINERAL DEFICIENCY ON MORPHOLOGICAL AND PHYSIOLOGICAL PARAMETERS AND ON SHOOT AND ROOT MINERAL PARTITIONING IN THREE SUNFLOWER VARIETIES / EFECTO DE LA FALTA DE ELEMENTOS MINERALAS SOBRE LOS PARAMENTROS MORFOLOGICOS Y FISIOLOGICOS Y REPARTICION DE ELEMENTOS MINERALES DE LA PARTE SOBRE EL SUELO Y DE LA RAIZ EN TRES VARIEDADES / INFLUENCE DE LA CARENCE D’ÉLÉMENTS MINÉRAUX SUR LES PARAMÈTRES MORPHOLOGIQUES ET PHYSIOLOGIQUES ET SUR LA DISTRIBUTION DES ÉLÉMENTS MINÉRAUX ENTRE LA PARTIE AÉRIENNE ET LA RACINE POUR TROIS SORTES DE TOURNESOL

Helia ◽  
2001 ◽  
Vol 24 (35) ◽  
pp. 135-148
Author(s):  
Mohammed El Midaoui ◽  
Ahmed Talouizte ◽  
Benbella Mohamed ◽  
Serieys Hervé ◽  
Ait Houssa Abdelhadi ◽  
...  
Keyword(s):  
Leaf Area ◽  
Dry Matter ◽  
Growth Parameters ◽  
Dry Weight ◽  
Mineral Deficiency ◽  
P Deficiency ◽  
Plant Parts ◽  
Shoot Dry Weight ◽  
K Deficiency ◽  
Matter Effect

SUMMARYAn experiment has been carried out in order to study the behaviour under mineral deficiency of three sunflower genotypes, a population variety (Oro 9) and two hybrids (Mirasol and Albena). Sunflower seedlings were submitted to five treatments: N deficiency (N0), P deficiency (P0), K deficiency (K0), N and K deficiency (N0K0) and a control. Plants were harvested when they reached 3-4 true pairs of leaves. Growth parameters measured (height, total leaf area, root length, root and shoot dry mater) were all significantly reduced by mineral deficiency. Leaf area was most reduced by N0 (-61%) and P0 (-56%). Total dry matter was most affected by N0 (-63%) and by N0K0 (-66%). Genotype comparisons showed that Oro 9 had the highest shoot dry matter while Albena had the lowest root dry matter. Effect of mineral deficiency on content and partitioning of N, P, K, Ca and Na was significant and varied according to treatments and among plant parts. Shoot dry weight was significantly correlated with root N content (r2=0.81) and root K content (r2=-0.61) for N0 and K0.

Application Research of Neural Expert System on Tree Growth Model

2014 ◽  
Vol 513-517 ◽  
pp. 3728-3731
Author(s):  
Wen Qing Zhang
Keyword(s):  
Expert System ◽  
Tree Growth ◽  
Growth And Development ◽  
Production Management ◽  
Environmental Control ◽  
Growth Parameters ◽  
Growth Models ◽  
Growth Management ◽  
Management Decision ◽  
Factors Affecting

In order to simulate growth and development process of tree, then provide services for production management and scientific research, all kinds of tree growth models are constructed. The paper firstly considers a variety of factors affecting the growth and development of tree, then studies artificial intelligence knowledge such as neural network and expert system, uses the neural expert system to solve the acquisition and management of tree growth parameters, and design and develop tree growth management and expert system based on growth models, the models combine morphogenesis model of tree and knowledge model to provide comprehensive environmental control and management decision-making. Practice has indicated that the growth models of tree can reflect the growth of trees under different physiological and ecological conditions, and visual effect is very good.

CONGENITAL SUCRASE-ISOMALTASE DEFICIENCY

PEDIATRICS ◽  
1972 ◽  
Vol 49 (6) ◽  
pp. 847-853
Author(s):  
I. Antonowicz ◽  
J. D. Lloyd-Still ◽  
K. T. Khaw ◽  
H. Shwachman
Keyword(s):  
Growth And Development ◽  
Clinical Presentation ◽  
Quantitative Estimation ◽  
Failure To Thrive ◽  
Normal Growth ◽  
Significant Rise ◽  
Small Intestinal Mucosa ◽  
Severe Diarrhea ◽  
Young Infants ◽  
Small Intestinal

Observations over a period of 6 years are reported on 10 children in whom the diagnosis of congenital sucrase isomaltase deficiency (SID) was confirmed by quantitative estimation of disaccharidase activity of the small intestinal mucosa. Repeat biopsies were performed on eight of the ten patients and showed no evidence that sucrase isomaltase activity is acquired. Sucrose tolerance tests (2 gm/kg) showed no significant rise in blood glucose in the seven patients in whom they were performed. This condition may appear in young infants with severe diarrhea resulting in a malabsorption syndrome and failure to thrive. It may also be manifest in a milder clinical presentation with bothersome diarrhea in spite of normal growth and development in the older infant or young child. The diagnosis in this latter group can be difficult, and is frequently missed.

Annona muricata (soursop).

2021 ◽  
Author(s):  
Marianne Jennifer Datiles ◽  
Pedro Acevedo-Rodríguez
Keyword(s):  
East Asia ◽  
Fruit Trees ◽  
The Philippines ◽  
Home Gardens ◽  
South East Asia ◽  
Annona Muricata ◽  
Old World ◽  
Evergreen Tree ◽  
Tropical America ◽  
Dark Green

Abstract A. muricata is a small evergreen tree up to 9 m tall. It is native to tropical America but is widely planted in home gardens in South-East Asia. In Brazil, several small commercial plantations are in operation (about 2000 hectares are planted) with more planned. It was one of the earliest fruit trees introduced to the old world, brought to the Philippines by the Spanish. It is valued chiefly for its edible fruits, which are large (> 1 kg), heart-shaped and dark green in colour. The flesh is tart, desirable for ice creams and drinks, fruit jellies and sweetcakes. In the Philippines, young fruits with seeds still soft are used as a vegetable.

Effect of dietary menhaden oil on normal growth and development and on ameliorating mucosal injury in rats

1991 ◽  
Vol 54 (2) ◽  
pp. 346-350 ◽  
Author(s):  
J A Vanderhoof ◽  
D J Blackwood ◽  
H Mohammadpour ◽  
J H Park
Keyword(s):  
Growth And Development ◽  
Normal Growth ◽  
Mucosal Injury ◽  
Menhaden Oil

scholarly journals Surgical cause of respiratory distress in a newborn

2021 ◽  
Vol 8 (9) ◽  
pp. 1629
Author(s):  
Vishnu Vardhan Reddy M. ◽  
Suguna Reddy C. ◽  
Yoga Nagendhar ◽  
Vardhini Sree D.
Keyword(s):  
Respiratory Distress ◽  
Growth And Development ◽  
Congenital Heart ◽  
Heart Diseases ◽  
Normal Growth ◽  
Surgical Excision ◽  
Term Infant ◽  
Congenital Heart Diseases ◽  
Common Causes ◽  
Lobar Emphysema

Common causes of respiratory distress in a term infant include transient tachypnoea of newborn, sepsis/congenital pneumonia and congenital heart diseases. Surgical causes of distress in a newborn are rare and should be considered when other causes have been ruled out. We report a case of an early term female neonate who developed respiratory distress immediately after birth which was gradually progressive and required respiratory support. On evaluation with chest radiography and CT, a diagnosis of congenital lobar emphysema (CLE) was made. Immediate surgical resection was planned and done on day 8 of life. Post operatively she had no respiratory distress and discharged within a week. Baby is now healthy with normal growth and development. Half of the cases of CLE are diagnosed within the first 6 months of life but very few cases present with respiratory distress since birth. Timely diagnosis and early surgical excision in neonates <2 months improve the outcome, as seen in our case.

scholarly journals The nutritional adequacy of plant-based diets

1999 ◽  
Vol 58 (2) ◽  
pp. 265-269 ◽  
Author(s):  
T. A. B. Sanders
Keyword(s):  
Growth And Development ◽  
Normal Growth ◽  
Vitamin B ◽  
Plant Origin ◽  
Nutritional Adequacy ◽  
Bioactive Substances ◽  
Vegetarian Diets

The nutritional adequacy of plant-based diets is discussed. Energy and protein intakes are similar for plant-based diets compared with those containing meat. Fe and vitamin B12 are the nutrients most likely to be found lacking in such diets. Bioactive substances present in foods of plant origin significantly influence the bioavailability of minerals and requirements for vitamins. Well-balanced vegetarian diets are able to support normal growth and development. It is concluded that meat is an optional rather than an essential constituent of human diets.

Improved Student Learning of Infant Growth and Development

PEDIATRICS ◽  
1978 ◽  
Vol 62 (5) ◽  
pp. 775-777
Author(s):  
Paula L. Stillman ◽  
Jane S. Ruggill ◽  
Darrell Sabers
Keyword(s):  
Medical Students ◽  
Growth And Development ◽  
Traditional Instruction ◽  
Normal Growth ◽  
Normal Infant ◽  
Healthy Children ◽  
Longitudinal Development ◽  
Comparison Groups ◽  
Experimental Group

All physicians who care for children require a knowledge of normal growth and development in order to detect and interpret abnormalities. Yet traditional instruction tends to focus on the ill child and rarely provides students the opportunity to follow up the cases of healthy children over a prolonged period of time. A new course was developed that enabled students to observe the longitudinal development of a normal infant from birth to age 16 months. At the completion of the course, a multiple-choice examination covering developmental concepts from birth to age 6 years was administered to the students who participated in this course (experimental group) and to two comparison Groups. The experimental group scored substantially higher than both comparison groups on items covering birth to age 18 months. The program offers an opportunity for medical students to observe the longitudinal development of a normal infant and appears complementary to other instructional methods.

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