scholarly journals Soybean (Glycine max) seed growth characteristics in response to light enrichment and shading

2011 ◽  
Vol 52 (No. 4) ◽  
pp. 178-185 ◽  
Author(s):  
X. Liu ◽  
S.J. Herbert ◽  
K. Baath ◽  
A.M. Hashemi
Keyword(s):  
Growth Rate ◽  
Glycine Max ◽  
Seed Size ◽  
Growth Rates ◽  
Dry Weight ◽  
Cell Number ◽  
Seed Filling ◽  
Light Reduction ◽  
Seed Growth ◽  
Cotyledon Cell

Seeds are the primary sinks for photosynthates during reproductive growth. Variation in light intercepted during and after seed initiation has been found a major environmental determinant of soybean [Glycine max(L.) Merrill] seed size. We investigated the influence of light enrichment and shading on seed growth rate, effective filling, cotyledon cell number, cell volume and endogenousABA concentrations of cotyledons/testas during seed filling of soybean. Evans, an indeterminate Group 0 soybean, was subjected to light reduction and enrichment treatments from the beginning of pod formation until final harvest for two years inMassachusetts. Higher rates of seed growth, greater seed dry weight, and higher cotyledon cell number were all observed with light enrichment. There was a reduction in seed growth rate and cotyledon cell number, along with a significant lowering of endogenousABA levels in testa and cotyledon with shade. The level ofABAin cotyledon during seed development was significantly correlated with seed growth rates only under shade treatments. Both the growth rates and seed filling duration were influenced by variation in light interception by the soybean canopy. The effects of varying light treatment on seed size, within one genotype, were most likely due to the differences in seed growth rate and cotyledon cell number.

Seed size and seed growth rate in relation to cotyledon cell volume and number in common bean

1997 ◽  
Vol 54 (2-3) ◽  
pp. 163-172 ◽  
Author(s):  
P.J. Sexton ◽  
K.J. Boote ◽  
J.W. White ◽  
C.M. Peterson
Keyword(s):  
Growth Rate ◽  
Common Bean ◽  
Cell Volume ◽  
Seed Size ◽  
Seed Growth ◽  
Cotyledon Cell

Relationships Between RNA–DNA Ratio, Prey Density, and Growth Rate in Atlantic Cod (Gadus morhua) Larvae

1979 ◽  
Vol 36 (12) ◽  
pp. 1497-1502 ◽  
Author(s):  
L. J. Buckley
Keyword(s):  
Growth Rate ◽  
Nutritional Status ◽  
Growth Rates ◽  
Prey Density ◽  
Gadus Morhua ◽  
Slow Growth ◽  
Atlantic Cod ◽  
Larval Fish ◽  
Dry Weight ◽  
Dna And Rna

The protein, DNA, and RNA content of larvae maintained at 1.0 plankter/mL increased at the rates of 9.3, 9.9, and 9.8% per day, respectively, for the 5 wk after hatching. Protein reserves of larvae held at 0 or 0.2 plankters/mL were depleted by 45 and 35%, respectively, prior to death 12–13 d after hatching. Starved larvae had similar protein concentrations (percent of dry weight), lower RNA concentrations, and higher DNA concentrations than fed larvae. Larvae held at higher plankton densities had higher RNA–DNA ratios and faster growth rates than larvae held at lower plankton densities. The RNA–DNA ratio was significantly correlated (P < 0.01) with the protein growth rate. The RNA–DNA ratio appears to be a useful index of nutritional status in larval Atlantic cod (Gadus morhua) and may be useful for determining if cod larvae were in a period of rapid or slow growth at the time of capture. Key words: RNA–DNA ratio, starvation, protein, nucleic acids, growth, larval fish, Atlantic cod

COMPARATIVE STUDIES OF NORTH AMERICAN AND EUROPEAN CULTURES OF THE ROOT ROT FUNGUS, FOMES ANNOSUS (FR.) COOKE

1955 ◽  
Vol 33 (5) ◽  
pp. 416-428 ◽  
Author(s):  
D. E. Etheridge
Keyword(s):  
Growth Rate ◽  
North American ◽  
Growth Rates ◽  
Root Rot ◽  
Linear Growth ◽  
Morphological Characteristics ◽  
Dry Weight ◽  
Cellulolytic Activity ◽  
Ph Optimum ◽  
Two Cultures

Cultures of Fames annosus originating in Europe could not be distinguished from those originating in North America either by colony appearance, growth rate, pH optimum, or cellulolytic activity. Three growth rate types on 2.5% malt agar were recognized and these are ascribed to individual variation rather than to host or geographical influences. Successive subculturing produced variants that fell into three growth classes. Half of the isolates displayed spontaneous, but reversible, changes in growth rate and colony appearance during subculturing and this is discussed from the standpoint of genetical and environmental influences. Cultures displaying different morphological characteristics and linear-growth rates differed little metabolically; each had a similar pH optimum ranging from 4.6 to 5.5, and each proved capable of altering the initial acidity of the medium to a reaction which was more suitable for growth. Two cultures were characterized by double pH optima at 4.6 and 5.5. Cultures having different linear-growth rates produced about the same dry-weight of mycelium on a cellulose substrate in a semisynthetic nutrient solution. On the basis of a statistical analysis of cellulose utilization by representative isolates it was impossible to distinguish between North American and European cultures.

Influence of Soybean Seed Size on Response to Atrazine

Weed Science ◽  
1970 ◽  
Vol 18 (1) ◽  
pp. 162-164 ◽  
Author(s):  
Robert N. Andersen
Keyword(s):  
Regression Analysis ◽  
Glycine Max ◽  
Seed Size ◽  
Selection Criterion ◽  
Soybean Seed ◽  
Dry Weight ◽  
Large Seed ◽  
Untreated Check ◽  
Initial Selection

In the greenhouse, we examined approximately 2,700 strains of soybeans [Glycine max (L.) Merr.] for response to 2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine (atrazine), a herbicide which inhibits photosynthesis. Duration of survival when grown in soil containing 0.84 kg/ha was the initial selection criterion. Strains thus selected as most tolerant and most susceptible were grown then for 3 to 3 ½ weeks in soil containing 0.45 kg/ha of atrazine. The dry weight of shoots expressed as a percentage of each strain's own untreated check was used to measure the strains' tolerance of atrazine. Tolerance, thus measured, generally increased as seed size increased. Regression analysis indicated that 80% of the variation in response was attributable to variation in seed size. We suggest the possibility of minimizing soybean injury from atrazine (and perhaps other herbicides) by planting large seed.

The development of barley grain: comparisons between cultivars for growth rate and α-amylase activity

1976 ◽  
Vol 86 (3) ◽  
pp. 603-608 ◽  
Author(s):  
T. J. Riggs ◽  
P. G. Gothard
Keyword(s):  
Growth Rate ◽  
Grain Growth ◽  
Growth Rates ◽  
Amylase Activity ◽  
Spring Barley ◽  
Dry Weight ◽  
Barley Grain ◽  
Absolute Level ◽  
Barley Cultivars ◽  
Days After Anthesis

SummaryGrains from ears of known anthesis time in seven spring barley cultivars were measured for dry weight and α-amylase activity at regular intervals during grain maturation. During the period 10–31 days after anthesis, dry weight increase of the grain was found to be substantially linear in all the cultivars. Comparisons between linear slopes fitted for this phase of growth were found to provide an objective means of comparing grain growth rates in different cultivars.α-Amylase activity per grain reached a peak in all except one cultivar at between 10 and 16 days after anthesis but declined rapidly during the linear phase of grain growth. α-Amylase activity per gram grain dry weight decreased exponentially during this period and transformation of the data to logarithms allowed a substantially linear fit to be made. Slopes for each of the cultivars were compared.Differences were found between cultivars in grain growth rates, total α-amylase activity and rates of fall of α-amylase activity per gram for the period 10–31 days after anthesis. No relationship could be found between grain growth rate and either the absolute level of α-amylase activity achieved in the grain or the rate of fall in activity during development.

scholarly journals Cotyledon Cells and Seed Growth Relationships in CO2-enriched Peanut1

1990 ◽  
Vol 17 (1) ◽  
pp. 4-6 ◽  
Author(s):  
F. J. M. Sung ◽  
J. J. Chen
Keyword(s):  
Cell Size ◽  
Seed Size ◽  
Co2 Enrichment ◽  
Dynamic Component ◽  
Factors Affecting ◽  
High Co2 ◽  
Arachis Hypogaea L ◽  
Seed Growth ◽  
Cotyledon Cell ◽  
Cotyledon Cells

Abstract Seed size is a dynamic component of seed yield. Factors affecting seed size in peanut (Arachis hypogaea L.) are not well defined. The objectives of this study were to investigate the effects of CO2 enrichment and timing of pod formation on cotyledon cell and seed growth in virginia-type peanut. The results indicated that the number of cotyledon cells was relatively constant across all the treatments. However, size of cotyledon cells and seed growth rate (SGR) increased in the pods developed in high CO2 conditions. Striking differences in both cell size and SGR also existed between early and late formed pods. Our data indicate that assimilate supplies strongly limit cotyledon cell size, and accordingly affect SGR and final seed size

Recurrent Selection for Seed Size in Soybean: II. Indirect Effects on Seed Growth Rate

Crop Science ◽  
1992 ◽  
Vol 32 (6) ◽  
pp. 1480-1483 ◽  
Author(s):  
Christopher N. Tinius ◽  
Joseph W. Burton ◽  
Thomas E. Carter
Keyword(s):  
Growth Rate ◽  
Seed Size ◽  
Indirect Effects ◽  
Recurrent Selection ◽  
Seed Growth ◽  
Selection For

Endogenous hormones in seed, leaf, and pod wall and their relationship to seed filling in soybeans

2010 ◽  
Vol 61 (2) ◽  
pp. 103 ◽  
Author(s):  
Bing Liu ◽  
Xiao-bing Liu ◽  
Cheng Wang ◽  
Jian Jin ◽  
S. J. Herbert
Keyword(s):  
Seed Size ◽  
Seed Quality ◽  
Endogenous Hormones ◽  
Filling Rate ◽  
Genetic Trait ◽  
Seed Filling ◽  
Seed Growth ◽  
Pod Wall ◽  
Two Peaks ◽  
Indole 3 Acetic Acid

In order to investigate the possible relationship between endogenous hormones and seed filling in soybeans, concentrations of abscisic acid (ABA), gibberellins (GA3), indole-3-acetic acid (IAA), and cytokinins (ZR) in seed, leaf, and pod wall were determined during seed filling of 3 soybean cultivars differing in seed size and quality. All cultivars were grown at 3 densities. The large-seeded cultivar had a strong and greater ability to accumulate photosynthate during seed filling. The genetic trait of seed size was fully expressed at low density. The large-seeded cultivar had a much higher ABA concentration in seed than the moderate and small-seeded cultivars before physiological maturity. ABA concentration in the large-seeded cultivar seed was 40% greater than that of the small-seeded cultivar at 30 days after flowering. Higher densities increased ABA concentrations in seeds. Two peaks of seed GA3 concentration were observed during seed filling. GA3 concentrations at all densities were similar. The peaks of IAA concentration in the 3 cultivars uniformly occurred at 50 days after flowering. The large-seeded cultivar had greater peak concentrations of GA3 and IAA in seed than the other cultivars, while the peak concentration of ZR was highest in the small-seeded cultivar. The concentrations of ABA in leaf increased with time while that of GA3 decreased. The large-seeded cultivar had higher ABA and IAA concentration in leaf while the small-seeded cultivar consistently had higher GA3 concentration in leaf. ZR was present in a smaller amount in the leaf, and was not detected in the pod wall. The large-seeded cultivar maintained higher IAA concentration in pod wall. ABA concentration in seed was positively correlated with seed-filling rate (P < 0.01, r = 0.85**, 0.92**, and 0.83** for large-, moderate- and small-seeded cultivars respectively).The concentration of GA3 in seed was significantly correlated with the seed-filling rate in large- and moderate-seeded cultivars (P < 0.01, r = 0.87**; P < 0.05, r = 0.63*), and no correlation was found for the small-seeded cultivar. There was no correlation between the concentrations of seed IAA, ZR, and seed-filling rate. There was a parallel relationship between seed growth and leaf/pod wall ABA concentration. Thus, ABA might offer a driving force for photosynthate phloem unloading in the seed coat. Lower concentration of ABA and GA3 in the leaf than in seed suggests that most of the two hormones is transported to seed. The mechanism of IAA in seed growth and GA3 concentration and its dynamic in seed quality need further investigation.

Dimension control in bacteria

1974 ◽  
Vol 20 (2) ◽  
pp. 231-236 ◽  
Author(s):  
Edward G. Sedgwick ◽  
Richard J. L. Paulton
Keyword(s):  
Growth Rate ◽  
Bacillus Subtilis ◽  
Cell Size ◽  
Growth Rates ◽  
Individual Cell ◽  
Cell Number ◽  
Cell Arrangement ◽  
Dimension Control ◽  
Constant Cell ◽  
The Individual

The effect of nutrition on the relation between growth rate and cell arrangement, cell size, and macro-molecular composition in Bacillus subtilis is described in comparison to earlier observations with other bacteria. Improvements in nutrition resulted in faster growth rates but, although the mass and size of the replicating unit (i.e. cell number/chain) also increased, there was no change in the mass or size of the individual cell. This constant cell size and variable cell arrangement in B. subtilis is in contrast to other bacteria and requires new proposals for the control of cell size and arrangement in different bacteria.

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