scholarly journals Factors Affecting Gerebera jamesonii Early Seedling Branching and Mortality

1996 ◽  
Vol 6 (1) ◽  
pp. 59-61
Author(s):  
Roar Moe ◽  
John E Erwin ◽  
Will Carlson
Keyword(s):  
Dry Weight ◽  
Seedling Development ◽  
Natural Light ◽  
Gerbera Jamesonii ◽  
Seedling Mortality ◽  
Factors Affecting ◽  
Early Seedling ◽  
Tree Leaf ◽  
Cotyledon Expansion

The role of irradiance and/or ethylene in inducing mortality and self-branching disorders in Gerbera jamesonii Bolus. seedlings was studied. Seedling mortality increased from 8% to 57% when seed was covered with vermiculite than left uncovered during germination. Supplemental lighting for 30 days after germination decreased seedling mortality and decreased the time to visible bud compared to seed germinated under natural light only. In subsequent experiments, seeds were germinated and then seedlings were water logged or sprayed with ethephon (0.69, 3.45, or 17.25 mM) at four different stages of seedling development. Half of the ethephon-treated seedlings were sprayed with silver thiosulfate (STS). Seedling mortality was greatest after cotyledon expansion but before expansion of the first tree leaf. The highest ethephon concentration caused reduced seedling dry weight after 42 days. Applying STS did not overcome self-branching or meristem necrosis.

RESPONSE OF ONION (Allium cepa) TO OXYFLUORFEN DURING EARLY SEEDLING DEVELOPMENT

1985 ◽  
Vol 65 (2) ◽  
pp. 357-362 ◽  
Author(s):  
W. C. AKEY ◽  
V. SOUZA MACHADO
Keyword(s):  
Allium Cepa ◽  
Dry Weight ◽  
Epicuticular Wax ◽  
Seedling Development ◽  
Allium Cepa L ◽  
Growth Room ◽  
Early Seedling ◽  
Growing Conditions ◽  
Relationship Of ◽  
Early Seedling Development

The response of onion (Allium cepa L.) to postemergence applications of oxyfluorfen during early seedling development was measured in growth room experiments. Tolerance to oxyfluorfen increased more than 70-fold from the late loop to the two fully developed leaf stage. Field and growth room experiments were also conducted to determine the relationship of spray retention and epicuticular wax on the tolerance of onion seedlings to the herbicide. In general, there was a progressive decrease in spray retention and a corresponding increase in epicuticular wax per unit dry weight as plant age increased. Spray retention in the field was approximately twice as great as in the growth room. The amount of epicuticular wax on the leaf surfaces of the onions was about equivalent under the two growing conditions. A significant decrease in epicuticular wax per unit dry weight between the late one-leaf and late two-leaf stages occurred under both field and growth room conditions, while tolerance to the herbicide continued to increase during the same period.Key words: Onions, oxyfluorfen, ED50, spray retention, epicuticular wax

scholarly journals Role of root UV-B sensing in Arabidopsis early seedling development

2008 ◽  
Vol 105 (52) ◽  
pp. 21039-21044 ◽  
Author(s):  
H. Tong ◽  
C. D. Leasure ◽  
X. Hou ◽  
G. Yuen ◽  
W. Briggs ◽  
...  
Keyword(s):  
Seedling Development ◽  
Early Seedling ◽  
Early Seedling Development

scholarly journals Spur Development of `Delicious' Apple as Influenced by Position, Wood Age, Strain, and Pruning

HortScience ◽  
1990 ◽  
Vol 25 (12) ◽  
pp. 1578-1581 ◽  
Author(s):  
Curt R. Rom ◽  
Bruce Barritt
Keyword(s):  
Leaf Area ◽  
Fruit Size ◽  
Dry Weight ◽  
Leaf Number ◽  
Tree Age ◽  
Factors Affecting ◽  
Area Reduction ◽  
Wood Age ◽  
Spur Length

The role of spur leaves in bud and fruit development on two spur-type `Delicious' apple strains (Malus domestica Borkh.) and factors affecting spur development were studied. Reducing spur leaf area on vegetative spurs in August reduced the number of spurs that flowered the following year but did not affect flower size. On spurs that did flower, leaf area reduction the previous year did not influence leaf number or area, but the bourse shoot leaf area was reduced. Spur bud diameter, leaf area, size, specific leaf weight (SLW), and leaf dry weight were larger on 2-year-old vegetative spurs than on 1- or 3-year-old spurs. Within each age section of a limb, spur leaf number, area, size, SLW, and bud diameter decreased from the apical to basal positions on the limb. Flower number did not vary within a limb section, but fruit set was lower on the most apical and basal spurs compared to midshoot spurs. Fruit size was largest at the apical end of each limb section and was smallest at basal positions. These relationships were not affected by strain, tree age, or orchard location. Summer pruning at 30 days after bloom tended to increase leaf number, area, size, and spur length compared to unpruned trees or pruning later in the season but did not influence spur bud diameter.

scholarly journals A Synthetic Peptide Encoded by a Random DNA Sequence Inhibits Discrete Red Light Responses

2019 ◽  
Author(s):  
Tautvydas Shuipys ◽  
Raquel F. Carvalho ◽  
Maureen A. Clancy ◽  
Zhilong Bao ◽  
Kevin M. Folta
Keyword(s):  
Dna Sequence ◽  
Dna Sequences ◽  
Synthetic Peptide ◽  
Red Light ◽  
Seedling Development ◽  
Light Responses ◽  
Random Peptide ◽  
Peptide Expression ◽  
Early Seedling ◽  
Cotyledon Expansion

AbstractWe have identified a synthetic peptide that interrupts discrete aspects of seedling development under red light. Previous reports have demonstrated that plants transformed with random DNA sequences produce synthetic peptides that affect plant biology. In this report one specific peptide is characterized that inhibits discrete aspects of red-light-mediated Arabidopsis thaliana development during photomorphogenesis. Seedlings expressing the PEP6-32 peptide presented longer hypocotyls and diminished cotyledon expansion when grown under red light. Other red-light-mediated seedling processes such as induction of Lhcb (cab) transcripts or loss of vertical growth remained unaffected. Long-term responses to red light in PEP6-32 expressing plants, such as repression of flowering time, did not show defects in red light signaling or integration. A synthesized peptide applied exogenously induced the long-hypocotyl phenotype under red light in non-transformed seedlings. The results indicate that the PEP6-32 peptide causes discrete cell expansion defects during early seedling development in red light, mimicking weak phyB alleles in some aspects of seedling photomorphogenesis. The findings demonstrate that new chemistries derived from random peptide expression can modulate specific facets of plant growth and development.One Sentence SummaryA plant line expressing random DNA sequence expresses a synthetic peptide that affects specific red-light responses in a developing seedling.

Effect of Temperature and Light Intensity Early in Ontogeny on Growth of Pinusresinosa Seedlings

1971 ◽  
Vol 1 (1) ◽  
pp. 57-65 ◽  
Author(s):  
T. T. Kozlowski ◽  
G. A. Borger
Keyword(s):  
Low Temperature ◽  
Light Intensity ◽  
Prolonged Exposure ◽  
Seedling Development ◽  
Effect Of Temperature ◽  
Low Light ◽  
Stage Of Development ◽  
Low Light Intensity ◽  
Early Seedling ◽  
Cotyledon Expansion

Low temperature or low light intensity following germination of Pinusresinosa seeds greatly suppressed subsequent seedling development, with cotyledon expansion inhibited more than root expansion. A strong influence of shoot environment early in ontogeny was demonstrated on initiation of all but a few early-formed primary needle primordia and on expansion of all primary needles, including those formed early. Low temperatures or low light intensities during the cotyledon stage of development prevented initiation of most of the normal complement of primary needles. However, when seedlings were placed in a favorable environment following prolonged exposure to low temperature or low light intensity, primordia of primary needles formed readily and subsequently expanded. Following seed germination, the young seedling is a system of competing carbohydrate sinks. Early development of the seedling is an integrated continuum with the source of growth requirements shifting during ontogeny, from megagametophytes to cotyledons, to primary needles, to secondary needles. The importance of cotyledons and primary needles to early seedling development is emphasized.

Role of ethylene crosstalk in seed germination and early seedling development: A review

2020 ◽  
Vol 151 ◽  
pp. 124-131 ◽  
Author(s):  
Golam Jalal Ahammed ◽  
Saikat Gantait ◽  
Monisha Mitra ◽  
Youxin Yang ◽  
Xin Li
Keyword(s):  
Seed Germination ◽  
Seedling Development ◽  
Early Seedling ◽  
Early Seedling Development
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