scholarly journals Physiological studies on the tabacco seedlings : I. The flowering reaction of the seedling grown by different environmental conditions in related to the exposure of low temperature.

1950 ◽  
Vol 19 (1-2) ◽  
pp. 152-156
Author(s):  
Y. Muraoka
Keyword(s):  
Low Temperature ◽  
Environmental Conditions ◽  
Physiological Studies

scholarly journals Procedures for evaluating the tolerance of cassava genotypes to postharvest physiological deterioration

2015 ◽  
Vol 50 (7) ◽  
pp. 562-570 ◽  
Author(s):  
Marcela Tonini Venturini ◽  
Vanderlei da Silva Santos ◽  
Eder Jorge de Oliveira
Keyword(s):  
Soil Moisture ◽  
High Temperature ◽  
Low Temperature ◽  
Environmental Conditions ◽  
Fungicide Treatment ◽  
High Soil Moisture ◽  
Root Position ◽  
Postharvest Physiological Deterioration ◽  
Significant Interference ◽  
Diagrammatic Scale

Abstract: The objective of this work was to define procedures to assess the tolerance of cassava genotypes to postharvest physiological deterioration (PPD) and to microbial deterioration (MD). Roots of six cassava genotypes were evaluated in two experiments, during storage under different environmental conditions: high temperature and low soil moisture; or low temperature and high soil moisture. Roots were treated or not with fungicide (carbendazim) before storage. Genotype reactions to MD and PPD were evaluated at 0, 2, 5, 10, 15, 20, and 30 days after harvest (DAH), in the proximal, medial, and distal parts of the roots. A diagrammatic scale was proposed to evaluate nonperipheral symptoms of PPD. Fungicide treatment and root position did not influence PPD expression; however, all factors had significant effect on MD severity. Genotypes differed as to their tolerance to PPD and MD. Both deterioration types were more pronounced during periods of higher humidity and lower temperatures. The fungicide treatment increased root shelf life by reducing MD severity up to 10 DAH. Whole roots showed low MD severity and high PPD expression up to 10 DAH, which enabled the assessment of PPD without significant interference of MD symptoms during this period.

scholarly journals Spring barley performances in the Pannonian zone

Genetika ◽  
2012 ◽  
Vol 44 (3) ◽  
pp. 499-512 ◽  
Author(s):  
Novo Przulj ◽  
Vojislava Momcilovic
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Genetic Variability ◽  
Plant Height ◽  
Water Deficit ◽  
Environmental Conditions ◽  
Spring Barley ◽  
Grain Filling ◽  
Growing Seasons ◽  
Grain Filling Period

Environmental conditions in the Pannonian zone can be characterized with moderate high temperature and partially water deficit during grain filling of spring barley, although low temperature and water deficit are possible also in period till anthesis. This study was conducted to evaluate the variation of the duration of the period from emergence to anthesis (VP), duration of grain filling period (GFP), plant height (PH), spikes number m-2 (SN), grains number spike-1 (GN), thousand grains weight (GW) and yield (YIL) in spring two-rowed barley in conditions of the Pannonian zone. All three factors; genotype, environment and the interaction GxY affected the studied traits. Average VP was 777 GDD, GFP 782 GDD, PH 78 cm, SN 523, GN 28.2, GW 43.2 g and YIL 6.26 t ha-1. Variation across varieties was higher than across growing seasons. Heritability varied from 0.66 for YIL to 0.94 for VP and GFP. This study confirmed that a sufficiently large genetic variability must be base for selecting appropriate varieties for the Pannonian zone conditions. In order to determine high yielding and quality barley extensive research in relation to breeding, variety choice for production and growing practice must be done.

scholarly journals The influence of geometrical parameters of the forming channel on the boundary value of the axial force in the agglomeration process of dry ice

2019 ◽  
Vol 254 ◽  
pp. 05001 ◽  
Author(s):  
Jan Górecki ◽  
Ireneusz Malujda ◽  
Dominik Wilczyński
Keyword(s):  
Carbon Dioxide ◽  
Low Temperature ◽  
Axial Force ◽  
Environmental Conditions ◽  
Main Parameter ◽  
Geometrical Parameters ◽  
Dry Ice ◽  
Agglomeration Process ◽  
Boundary Force

The article presents the results of study on the influence of geometrical parameters of the forming channels on axial force which is the main parameter of the agglomeration process of dry ice in the piston method. During research, the material was agglomerated utilizing different dies. The material is characterized by low temperature and sublimation under standard environmental conditions. The study focuses on determining the influence of geometrical parameters of the conical and cylindrical sections of the forming chamber which influence the value of yield stress in the carbon dioxide agglomeration process. The determination of the value of boundary force is the basis for formulating the construction assumptions which shall be the basis for designing and constructing the dry ice compaction and pelletization machine.

scholarly journals Production of Didymella rabiei Pseudothecia and Dispersal of Ascospores in a Mediterranean Climate

2005 ◽  
Vol 95 (11) ◽  
pp. 1279-1286 ◽  
Author(s):  
E. Gamliel-Atinsky ◽  
D. Shtienberg ◽  
H. Vintal ◽  
Y. Nitzni ◽  
A. Dinoor
Keyword(s):  
Low Temperature ◽  
Environmental Conditions ◽  
Low Temperatures ◽  
Mediterranean Climate ◽  
Temperature Requirement ◽  
Trap Plants ◽  
Series Of Experiments ◽  
The Mediterranean ◽  
Stem Segments

Temperature and wetness conditions required for development and maturation of Didymella rabiei pseudothecia were determined in a series of experiments conducted in controlled-environmental conditions. Initial stages of pseudothecium formation occurred at temperatures ranging from 5 to 15°C. Incubation at low temperatures was essential for subsequent pseudothecium maturation. This requirement was satisfied for chickpea stem segments incubated at 5 or 10°C for three consecutive weeks or during periods of 3 or 5 days, separated by periods at higher temperatures. Following the low-temperature requirement, subsequent pseudothecium development was independent of temperature in the range tested (5 to 20°C). Wetness was essential for pseudothecium production: pseudothecia formed and matured on stem segments maintained continuously wet but also on those exposed to periods of three or five wet days, separated by dry periods. The dispersal of D. rabiei ascospores was studied using chickpea plants as living traps in the field. Trap plants were infected mainly when exposed during rain but also in rainless periods. Results of this study enabled us to describe the developmental events leading to the production of the teleomorph stage and the dispersal of ascospores by D. rabiei in the Mediterranean climate of Israel.

scholarly journals Effects of Temperature, Light, and Rainfall on Superficial Scald Development in Apples

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 750E-750
Author(s):  
William J. Bramlage ◽  
Sarah A. Weis
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
New England ◽  
Environmental Conditions ◽  
Cool Temperature ◽  
Relative Importance ◽  
Light Conditions ◽  
Fruit Maturation ◽  
Superficial Scald ◽  
Effects Of Temperature

Preharvest environmental conditions apparently determine susceptibility of apples to postharvest scald development. Cool temperature, as hours below 10C, can greatly reduce susceptibility, but greater than 30C appears to enhance it. These effects appear to interact, because a high-temperature episode can cause loss of some low-temperature benefit. Shading of fruit increases their scald susceptibility and preharvest light conditions, along with preharvest rainfall, appear to be factors in scald susceptibility in New England. Fruit maturation reduces scald susceptibility. We are constructing models of contributions of these variables to scald susceptibility of fruit grown under different environmental conditions, and in this the relative importance of these variables is being evaluated.

scholarly journals Quality Deterioration of Commercial Bean (Phaseolus vulgaris) Seeds Stored under Contrasting Environmental Conditions in Sri Lanka

2020 ◽  
Vol 8 (1) ◽  
pp. 33-44
Author(s):  
R.A.I.S. Ariyarathna ◽  
S.L. Weerasena ◽  
C.K. Beneragama
Keyword(s):  
Sri Lanka ◽  
Low Temperature ◽  
Environmental Conditions ◽  
Seed Quality ◽  
Storage Period ◽  
Fluorescence Analysis ◽  
Quality Parameters ◽  
Full Potential ◽  
Ambient Conditions ◽  
Field Emergence

Bean is a popular vegetable grown in most parts of Sri Lanka. Farmers and home gardeners purchase seeds in packeted form retail outlets. However, quality problems are frequently reported, especially on low field germination. Quality parameters namely, percentage germination, field emergence, seedling length, vigour index and chlorophyll fluorescence analysis were used to determine the effect of different storage environmental conditions on seed longevity of two bean varieties during a two-year storage period, 2016 to 2018. Seeds in triple-laminated packets stored in four contrasting conditions; low temperature storage conditions (Tem. 5oC, 65% RH); three geo-environmental conditions namely, Gannoruwa (mid country wet zone), Kundasale (mid country intermediate zone), and Mahailuppallama (low country dry zone) showed varied behavior in seed quality parameters respective of the variety. It was apparent that germination test alone does not represent the full potential of field emergence. Results of the present study revealed that when field emergence and vigour are also taken in to account, both varieties of bean seeds can be stored under ambient conditions at Gannoruwa, Kundasale or MahaIlluppallama for a maximum period of 12 months, without compromising the seed quality. The seeds stored under low temperature conditions (i.e. 5 °C), maintained the seed germination over 75% for a period of 24 months.  

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