scholarly journals Влияние холодового стресса на некоторые признаки простых гибридов кукурузы

2021 ◽  
Author(s):  
Оксана Клименко ◽  
Keyword(s):  
Early Development ◽  
Plant Development ◽  
Low Temperatures ◽  
First Generation ◽  
Male Gametophyte ◽  
Pollen Grain ◽  
Stress Factor ◽  
Condi Tions ◽  
Grain Diameter

The purpose of this study was to determine the heritability of certain traits under low temperatures both at the stage of early plant development and at the haploid level, while identifying potentially stress resistant and productive hybrids. 14 simple hybrids of the first generation were used as the initial materi-al. The variability of signs of early development of plants and male gametophyte under low temperatures was evaluated. The coefficients of heritability of maternal and paternal genotypes under stressful condi-tions are calculated. A reliable dependence of the variability of the "pollen grain diameter" trait on the interaction of parental genotypes with a stress factor is shown. Hybrids Mo17xN6, Mo17xW23, A285xRf7, XL12xN6, XL12xP101 were the best in terms of the characteristics studied in the experiment.

Molecular genetics of cell interactions in Arabidopsis

Development ◽  
1993 ◽  
Vol 119 (Supplement) ◽  
pp. 77-84
Author(s):  
Robert E. Pruitt ◽  
Martin Hülskamp ◽  
Steven D. Kopczak ◽  
Sara E. Ploense ◽  
Kay Schneitz
Keyword(s):  
Transgenic Plants ◽  
Plant Development ◽  
Molecular Level ◽  
Male Gametophyte ◽  
Expression Patterns ◽  
Positional Information ◽  
Pollen Grain ◽  
Receptor Protein ◽  
Cellular Interactions ◽  
Different Types

Many events in plant development are regulated by the interactions of neighboring cells. We are interested in determining what sorts of molecules act as signals and/or receptors in these interactions and how these mechanisms relate to those used in animals and fungi. We are presently working on two different types of systems to try to address this question. In one case we are starting at the molecular level and characterizing a family of receptor protein kinase genes which seem natural candidates for mediating cellular interactions. By analyzing the expression patterns of these genes as well as the phenotypes of transgenic plants bearing altered genes we hope to determine what roles these proteins play in plant development. In the second case we are starting from the organismic level and using genetics to identify genes essential to a whole range of cellular interactions which are required for proper male gametophyte development during reproduction. These interactions involve both recognition of the pollen grain to verify that it is from the correct species and also a transfer of positional information from the female to the male which first allows the pollen tube to determine the polarity of the stigmatic cell on which it has germinated and later provides 'guidance' for the elongating tube to find the ovule.

scholarly journals AtSYP71 Is Important for Plant Cell Wall Biosynthesis and Stress Adaptation.

2021 ◽  
Author(s):  
Xiaoyue Kou ◽  
Hailong Zhang ◽  
Xiaonan Zhao ◽  
Mingjing Wang ◽  
Guochen Qin ◽  
...  
Keyword(s):  
Cell Wall ◽  
Early Development ◽  
Plant Development ◽  
Plant Cell Wall ◽  
Cell Plate ◽  
Development Stage ◽  
Cell Wall Biosynthesis ◽  
Knockout Mutant ◽  
Wall Structures ◽  
Confocal Images

Abstract Background: SYP71, the plant-specific Qc-SNARE protein, is reported to regulate vesicle trafficking. SYP71 is localized on the ER, endosome, plasma membrane and cell plate, suggesting its multiple functions. Lotus SYP71 is essential for symbiotic nitrogen fixation in nodules. AtSYP71, GmSYP71 and OsSYP71 are implicated in plant resistance to pathogenesis. To date, SYP71 regulatory role on plant development remain unclear.Results: AtSYP71-knockout mutant atsyp71-4 was lethal at early development stage. Early development of AtSYP71-knockdown mutant atsyp71-2 was delayed, and stress response was also affected. Confocal images revealed that protein secretion was blocked in atsyp71-2. Transcriptomic analysis indicated that metabolism, response to environmental stimuli pathways and apoplast components were influenced in atsyp71-2. Moreover, the contents of lignin, cellulose and flavonoids as well as cell wall structures were also altered.Conclusion: Our findings suggested that AtSYP71 is essential for plant development. AtSYP71 probably regulates plant development, metabolism and environmental adaptation by affecting cell wall homeostasis via mediating secretion of materials and regulators required for cell wall biosynthesis and dynamics.

Reproduction Multitasking: The Male Gametophyte

2021 ◽  
Vol 72 (1) ◽  
Author(s):  
Said Hafidh ◽  
David Honys
Keyword(s):  
Male Gametophyte ◽  
Cell Communication ◽  
Embryo Sac ◽  
Pollen Grain ◽  
Wall Structure ◽  
Annual Review ◽  
Publication Date ◽  
Developmental Phase ◽  
Double Fertilization ◽  
Male Gametes

The gametophyte represents the sexual phase in the alternation of generations in plants; the other, nonsexual phase is the sporophyte. Here, we review the evolutionary origins of the male gametophyte among land plants and, in particular, its ontogenesis in flowering plants. The highly reduced male gametophyte of angiosperm plants is a two- or three-celled pollen grain. Its task is the production of two male gametes and their transport to the female gametophyte, the embryo sac, where double fertilization takes place. We describe two phases of pollen ontogenesis—a developmental phase leading to the differentiation of the male germline and the formation of a mature pollen grain and a functional phase representing the pollen tube growth, beginning with the landing of the pollen grain on the stigma and ending with double fertilization. We highlight recent advances in the complex regulatory mechanisms involved, including posttranscriptional regulation and transcript storage, intracellular metabolic signaling, pollen cell wall structure and synthesis, protein secretion, and phased cell–cell communication within the reproductive tissues. Expected final online publication date for the Annual Review of Plant Biology, Volume 72 is May 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

The influence of temperature on the succession of redial and cercarial generations of Fasciola gigantica in a snail host

Parasitology ◽  
1964 ◽  
Vol 54 (1) ◽  
pp. 59-65 ◽  
Author(s):  
J. A. Dinnik ◽  
N. N. Diknik
Keyword(s):  
Larval Development ◽  
Low Temperatures ◽  
First Generation ◽  
Cold Season ◽  
Snail Host ◽  
Fasciola Gigantica ◽  
Natural Conditions ◽  
Influence Of Temperature ◽  
Cercarial Production ◽  
Influence Of Temperature On

Experiments on the larval development of Fasciola gigantica carried out under natural conditions have shown that at temperatures of 16° C. or less the rediae did not produce cercariae. The first-generation rediae, developed from the sporocyst, and all the rediae of subsequent generations produced only daughter rediae and did not change over to the production of cercariae as long as the low temperatures of the cold season lasted.As soon as the cold season ended and the temperature of the water in the aquaria containing the infected snails rose to a mean maximum of 20° C. all the rediae switched from redial to cercarial production.

POLLEN GRAIN PRESERVATION AT LOW TEMPERATURES IN VALUABLE COMMERCIAL ROSE CULTIVARS

2015 ◽  
pp. 63-66 ◽  
Author(s):  
A. Giovannini ◽  
A. Macovei ◽  
M. Donà ◽  
A. Valassi ◽  
M. Caser ◽  
...  
Keyword(s):  
Low Temperatures ◽  
Pollen Grain

scholarly journals PHOTOPERIODIC CONTROL OF DEVELOPMENTAL GROWTH IN BEGONIA × TUBERHYBRIDA

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1144G-1144
Author(s):  
Meriam G. Karlsson ◽  
Jeffrey W. Werner
Keyword(s):  
Early Development ◽  
Plant Development ◽  
Root Development ◽  
Growth And Development ◽  
Average Rate ◽  
Day Length ◽  
Seedling Height ◽  
Long Day ◽  
Developmental Growth ◽  
Short Days

Plants of Begonia x tuberhybrida `NonStop Orange', `Clips Orange' and `Musical Orange' were exposed to 1, 2, 3 or 4 weeks of short days initiated at 4 stages of plant development (immediately upon germination, 5 weeks after germination, 10 weeks after germination and 15 weeks after germination). Prior to and succeeding short days, plants were exposed to a day length of 16 hours at 100 μmol·m-2s-1. Short days were 9 hours at an irradiance level of 180 μmol·m-2s-1 to give the same total daily irradiance (5.8 mol· m-2day-1) as long day conditions. The temperature was maintained at 21° ± 4°C during the day and 18° ± 2°C during night. The observed growth and development responses were similar among the studied cultivars. During the period of 4 to 8 weeks after germination, the seedling height increased at an average rate of 0.7 mm day-1 for plants grown under long days and 0.3 mm day-1 for short day plants. The photoperiodic conditions did not affect the number of emerging leaves. The root development was more proliferate on plants allowed to develop under long days compared to plants exposed to short days during early development.

scholarly journals ANALISIS KOMPARATIF TEGANGAN STATIK PADA FRAME GANESHA ELECTRIC VEHICLES 1.0 GENERASI 1 BERBASIS CONTINOUS VARIABLE TRANSMISSION (CVT) BERBANTUAN SOFTWARE ANSYS 14.5

2020 ◽  
Vol 4 (1) ◽  
Author(s):  
Kadek Budarma ◽  
Kadek Rihendra Dantes ◽  
Gede Widayana
Keyword(s):  
Electric Vehicles ◽  
Factor Of Safety ◽  
First Generation ◽  
Static Stress ◽  
Stress Factor ◽  
Von Mises Stress ◽  
Critical Area ◽  
Electricity System ◽  
Variable Transmission ◽  
Von Mises

Rangka (frame) merupakan salah satu komponen yang penting dari sepeda motor karena berfungsi sebagai penopang mesin, sistem suspensi dan sistem kelistrikan sehingga menjadi satu kesatuan yang membuat sepeda motor dapat berjalan. Untuk itu, dilakukan analisis tegangan statik pada frame Ganesha electric vehicles 1.0 Generasi 1 yang menggunakan frame Yamaha Nouvo dengan menggunakan software Ansys 14.5 dengan perbandingan pembebanan satu penumpang dan dua penumpang. Tujuan penelitian adalah untuk mengetahui distribusi tegangan serta daerah kritis yang terjadi pada frame. Setelah proses analisis dilakukan, didapatkan tegangan von mises maksimum untuk frame standart dengan satu penumpang sebesar 4,5884 x 107 N/m2 dan frame modifikasi sebesar 4,1374 x 107 N/m2. Untuk frame standart dengan dua penumpang sebesar 1,0324 x 108 N/m2 dan frame modifikasi sebesar 9,3092 x 107 N/m2. Faktor keamanan frame standart dengan satu penumpang sebesar 13,52 dan frame modifikasi sebesar 14,99. Untuk frame standart dengan dua penumpang sebesar 6,00 dan frame modifikasi sebesar 6,66.Kata Kunci : Frame, Analisis Tegangan Statik, Ansys 14.5, Tegangan Von Mises, Faktor Keamanan Frame is one of the important components of the motorcycle because it is functioned as the supporting unit of the machine, suspension system and electricity system to make the motorcycle runs as one complete unit. For that reason, the analysis of the static stress was conducted to the first generation of Ganesha electric vehicles 1.0, which uses the frame of Yamaha Nouvo through Ansys 14.5 software with the comparison of one person weight and two persons weight. The purpose of the research is to know the distribution of the stress and the critical area that occurs at the frame. After the analysis has been conducted, it was found that the stress of the maximum von mises for the standart frame with one weight was 4,5884 x 107 N/m2 and the modificated frame was 4,1374 x 107 N/m2, for standart frame with two weights was 1,0324 x 108 N/m2 and modificated frame was 9,3092 x 107 N/m2. The factor of safety with one weight was at the value 13,52 while the modificated one valued 14,99. For the standart frame with two weights the value was 6,00 while the modificated valued 6,66.keyword : Frame, The analysis of static stress, Ansys 14.5, Von Mises stress , Factor of safety

Genetics of the viability of pollen grain produced at low temperatures inLycopersicon Mill.

Euphytica ◽  
1995 ◽  
Vol 84 (2) ◽  
pp. 139-144 ◽  
Author(s):  
R. Fernández-Muñoz ◽  
J. J. González-Fernández ◽  
J. Cuartero
Keyword(s):  
Low Temperatures ◽  
Pollen Grain

Low temperatures during early development influence subsequent maternal and reproductive function in adult female mice

2006 ◽  
Vol 87 (2) ◽  
pp. 416-423 ◽  
Author(s):  
Zeynep Benderlioglu ◽  
Jenny Eish ◽  
Zachary M. Weil ◽  
Randy J. Nelson
Keyword(s):  
Early Development ◽  
Adult Female ◽  
Low Temperatures ◽  
Reproductive Function ◽  
Female Mice
Sign in / Sign up

Export Citation Format

Share Document