FURTHER OBSERVATIONS ON THE RELATIONSHIP BETWEEN WINTERHARDINESS IN ROSES AND THE ELECTRIC IMPEDANCE OF UNINJURED TISSUES

1970 ◽  
Vol 50 (4) ◽  
pp. 493-497 ◽  
Author(s):  
FELICITAS SVEJDA
Keyword(s):  
Plant Tissue ◽  
Woody Plant ◽  
Electric Impedance ◽  
Rosa Rugosa ◽  
Maternal Parent ◽  
Growing Period ◽  
The Relationship

The magnitude of the electric impedance of woody plant tissue was not found to be indicative of winterhardiness, when measured on uninjured tissues during the growing period. This was shown by comparing the impedances between (a) hardy Rosa rugosa cultivars and tender R. chinensis cultivars, (b) R. rugosa cultivars of different hardiness levels of different parentage, and (c) seedlings of different hardiness levels but with a common maternal parent. The disagreement of these results with results of other workers is discussed.Earlier findings which indicated that the magnitude of the electric impedance characterizes certain plant genotypes were confirmed.

INVESTIGATIONS ON THE RELATIONSHIP BETWEEN WINTERHARDINESS IN ROSES AND THE ELECTRIC IMPEDANCE MEASURED DURING THE GROWING PERIOD

1966 ◽  
Vol 46 (4) ◽  
pp. 441-448 ◽  
Author(s):  
Felicitas Svejda
Keyword(s):  
Air Temperature ◽  
Temperature Gradients ◽  
Regression Coefficients ◽  
Electric Impedance ◽  
Impedance Measurements ◽  
Growing Period ◽  
The Relationship

Differences were found in the electric impedance of rose cultivars and seedlings, measured periodically under greenhouse and field cultures. Generally, plants with the highest ranking means were also hardy, but the magnitude of the impedance was not strictly indicative of hardiness since hardy plants were found with relatively low impedances.Fluctuations in the weekly impedance measurements corresponded to the rise and fall of the air temperature. The impedance was negatively correlated to the temperature. Different impedance temperature regression coefficients were were found for different cultivars and seedlings. It is not known how these temperature gradients should be interpreted biologically, but it is assumed that they are significant for the adaptation of plants.

The relationship between crop yield (or mean plant weight) of lettuce and plant density, length of growing period, and initial plant weight

1976 ◽  
Vol 86 (1) ◽  
pp. 83-91 ◽  
Author(s):  
M. A. Scaife ◽  
D. Jones
Keyword(s):  
Time Course ◽  
Plant Density ◽  
Unit Area ◽  
Subterranean Clover ◽  
Plant Weight ◽  
Relative Growth ◽  
Growing Period ◽  
Lettuce Growth ◽  
Log Linear ◽  
The Relationship

SUMMARYLettuce obeys the Shinozaki–Kira relationship in which the reciprocal of plant weight is linearly related to plant density. The intercept (a) represents the reciprocal of the weight of an isolated plant and the slope (b) represents the reciprocal of yield/unit area at high densities (the ‘ceiling yield’). This work examines the time course of (a) and (b) in an ‘ideal environment’ in which water and nutrients are non-limiting, and the light/temperature regime is constant.Two pot experiments are described: the first showed that the growth of isolated lettuces follows a logistic expression, which can therefore be substituted for a–1 in the Shinozaki-Kira equation. It was then hypothesized that b–1, the ‘ceiling yield’ would be constant over time. This was confirmed by the second experiment, giving the equationw–1t = w–10 e1–kt × w–1max × bd,in which wt is mean plant weight at time t, w0 and wmax are the initial and final weights of isolated plants, k is the early relative growth rate of such plants, b–1 is the constant ceiling yield, and d is the plant density.Two examples of the use of the equation are given: one shows how it predicts the interaction between seed size and plant density within a species (subterranean clover): the other illustrates how it can be used to explain why lettuce growth appears to be log-linear against time whereas cereal growth is more nearly just linear.

INFLUENCE OF STRAIN AND SEX ON THE RELATIONSHIP OF PROTEIN TO ENERGY IN THE RATIONS OF GROWING AND FINISHING BACON PIGS

1959 ◽  
Vol 39 (1) ◽  
pp. 102-114 ◽  
Author(s):  
J. P. Bowland ◽  
R. T. Berg
Keyword(s):  
Feed Efficiency ◽  
Carcass Characteristics ◽  
Strain Differences ◽  
High Energy ◽  
Low Energy ◽  
High Protein ◽  
Growing Period ◽  
Strain Interaction ◽  
Relationship Of ◽  
The Relationship

Rations varying in energy (65 to 79 per cent TDN or 69 to 88 per cent apparent digestible energy) and protein (13 to 21 per cent) were studied in two experiments with 120 pigs of four strains. Rate of liveweight gain tended to be fastest in pigs fed high energy-high protein rations throughout. Males gained more rapidly than females, with strain differences being evident. Strain × sex interactions in rate of gain were present in both the growing and finishing period, with a ration × strain interaction present in the growing period. There was an indication that in the growing period pigs on high energy, particularly high energy-high protein rations ate more than pigs fed low energy rations. In the finishing period low energy rations were consumed at a higher rate than high energy rations with protein level having no influence on feed intake. In the growing period to 110 pounds, high protein rations resulted in improved feed efficiency as compared to medium protein rations, while in the finishing period to market weight high energy rations were more efficient than low energy rations. There was evidence that high protein alone or in combination with high energy rations also improved efficiency of feed utilization in the finishing period. Female pigs required less feed per pound gain than male pigs in the finishing period. High energy rations resulted in increased dressing percentage and generally inferior carcasses. There was an indication that high protein rations resulted in leaner carcasses. Carcass length was not influenced by ration. Carcasses from female pigs excelled those from male pigs in all factors measured except carcass length. Strain differences in carcass characteristics existed but no appreciable strain × ration interactions were noted.

scholarly journals Yellow Sap Contamination on Mangosteen (Garcinia mangostana L.) Fruit in Relation to Soil Calcium Contents and Plant Tissue

2021 ◽  
pp. 1-10
Author(s):  
. Martias ◽  
Titin Purnama ◽  
. Riska ◽  
. Affandi ◽  
Sri Yuliati ◽  
...  
Keyword(s):  
Plant Tissue ◽  
Sampling Method ◽  
Soil Samples ◽  
Site Location ◽  
Garcinia Mangostana ◽  
Fruit Flesh ◽  
Soil Calcium ◽  
West Sumatra ◽  
The Relationship ◽  
Leaf Part

Yellow sap contamination (YSC) is one of the mangosteen quality constrain in Indonesia. Calcium is the prominent nutrient that influence the incidence of yellow sap contamination. A research with objective to observe the relationship between incidence YSC and Ca availability in soil as well as plant tissue was done in ten locations in West Sumatra, Lampung and West Java provinces. Purposive random sampling method was used to determine the site locations. The plant and soil samples were collected from 10 sites and ten tree per sites. Correlation analysis was used to measure the relationship between incidence YSC and Ca content in fruit endocarp, mesocarp, peel, soil and leaf. The result showed that there was a variation of incidence YSC in site location with range of 8.7%−54.04%; 4.0−51.6%; and 17.7−78.6% for percentage of YSC in fruit flesh, segmentation and peel, respectively. Ca content in soil, endocarp, mesocarp and leaf were given significantly negative correlation toward incidence YSC in fruit flesh and segmentation. Ca content in leaf part correlates significantly to Ca availability in soil, endocarp and mesocarp. Ca content in leaf in the range of 1.40- 1.70% indicates YSC less than 10%.

scholarly journals Single nucleus analysis of Arabidopsis seeds reveals new cell types and imprinting dynamics

2020 ◽  
Author(s):  
Colette L. Picard ◽  
Rebecca A. Povilus ◽  
Ben P. Williams ◽  
Mary Gehring
Keyword(s):  
Cell Types ◽  
Cell Cycle Phase ◽  
Cycle Phase ◽  
Parental Conflict ◽  
Imprinted Genes ◽  
Maternal Tissue ◽  
Maternal Parent ◽  
Single Nucleus ◽  
Parental Bias ◽  
The Relationship

AbstractSeeds are the basis of agriculture, yet their full transcriptional complexity has remained unknown. Here, we employ single-nucleus RNA-sequencing to characterize developing Arabidopsis thaliana seeds, with a focus on endosperm. Endosperm, the site of gene imprinting in plants, mediates the relationship between the maternal parent and embryo. We identify new cell types in the chalazal endosperm region, which interfaces with maternal tissue for nutrient unloading. We further demonstrate that the extent of parental bias of maternally expressed imprinted genes varies with cell cycle phase, and that imprinting of paternally expressed imprinted genes is strongest in chalazal endosperm. These data indicate imprinting in endosperm is heterogeneous and suggest that parental conflict, which is proposed to drive the evolution of imprinting, is fiercest at the boundary between filial and maternal tissues.

INJURY TO ACTIVE METABOLISM IN WOODY PLANT TISSUE ASSESSED BY 86Rb (K ANALOGUE) UPTAKE AND ELECTRICAL CAPACITANCE TECHNIQUES

1989 ◽  
Vol 69 (4) ◽  
pp. 1273-1276
Author(s):  
DWAYNE ANDREWS ◽  
DAVID FENSOM
Keyword(s):  
Plant Tissue ◽  
Woody Plants ◽  
Woody Plant ◽  
Ion Uptake ◽  
Electrical Capacitance ◽  
Tissue Viability ◽  
Active Metabolism ◽  
Uptake Test

Using 86Rb as an analogue for K+, the uptake of K-ions in 15 mg during one hour in labelled KCl (1 mmolar) solution has been found to be very significantly different in tissue from living twigs of woody plants compared with that from dead twigs. This uptake test has been successfully applied to twigs and discriminates among living, damaged and killed tissue. A modification can assess damage to buds. Ion uptake results supplement the results of electrical cambial capacitance, measured at temperatures 10–25 °C.Key words: Tissue, viability, ion uptake

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