An experimental study of hybridization and pollination in Salix (willow)

1974 ◽  
Vol 52 (7) ◽  
pp. 1613-1619 ◽  
Author(s):  
George W. Argus
Keyword(s):  
Experimental Study ◽  
Flowering Time ◽  
Field Experiments ◽  
Natural Hybridization ◽  
Pollen Competition ◽  
Insect Vectors ◽  
Synthetic Hybrids ◽  
The Cross ◽  
Experimental Crosses ◽  
Salix Discolor

Experimental crosses between Salix discolor, S. petiolaris, S. bebbiana, and S. lucida resulted in the synthetic hybrids S. discolor × petiolaris and S. bebbiana × petiolaris and their reciprocals. The cross S. bebbiana × discolor and all crosses involving S. lucida were unsuccessful. Field experiments on the mode of pollination of Salix revealed the presence of wind-borne pollen of S. discolor, S. petiolaris, and S. bebbiana, and seed was set by these species in the absence of insect vectors. They are suspected to be both entomophilous and anemophilous. Salix lucida did not set seeds under these conditions and it is hypothesized that it is fundamentally entomophilous. Evidence is presented that suggests that natural hybridization between S. discolor and S. petiolaris may be restricted by differences in flowering time and by pollen competition.

Experimental study on the cross-shear roll bending process

2021 ◽  
Author(s):  
Mengrou Lv ◽  
Lianhong Zhang ◽  
Baiyan He ◽  
Feiping Zhao ◽  
Senlin Li ◽  
...  
Keyword(s):  
Experimental Study ◽  
Roll Bending ◽  
Bending Process ◽  
The Cross

Design of a Brassica rapa core collection for association mapping studiesThis article is one of a selection of papers from the conference “Exploiting Genome-wide Association in Oilseed Brassicas: a model for genetic improvement of major OECD crops for sustainable farming”.

Genome ◽  
2010 ◽  
Vol 53 (11) ◽  
pp. 884-898 ◽  
Author(s):  
Jianjun Zhao ◽  
Anna Artemyeva ◽  
Dunia Pino Del Carpio ◽  
Ram Kumar Basnet ◽  
Ningwen Zhang ◽  
...  
Keyword(s):  
Association Mapping ◽  
Flowering Time ◽  
Brassica Rapa ◽  
Core Collection ◽  
Field Experiments ◽  
Research Centre ◽  
Candidate Gene Approach ◽  
Core Collections ◽  
Genome Wide ◽  
Using Data

A Brassica rapa collection of 239 accessions, based on two core collections representing different morphotypes from different geographical origins, is presented and its use for association mapping is illustrated for flowering time. We analyzed phenotypic variation of leaf and seed pod traits, plant architecture, and flowering time using data collected from three field experiments and evaluated the genetic diversity with a set of SSR markers. The Wageningen University and Research Centre (WUR) and the Vavilov Research Institute of Plant Industry (VIR) core collections had similar representations of most morphotypes, as illustrated by the phenotypic and genetic variation within these groups. The analysis of population structure revealed five subgroups in the collection, whereas previous studies of the WUR core collection indicated four subgroups; the fifth group identified consisted mainly of oil accessions from the VIR core collection, winter oils from Pakistan, and a number of other types. A very small group of summer oils is described, that is not related to other oil accessions. A candidate gene approach was chosen for association mapping of flowering time with a BrFLC1 biallelic CAPS marker and a BrFLC2 multiallelic SSR marker. The two markers were significantly associated with flowering time, but their effects were confined to certain morphotypes and (or) alleles. Based on these results, we discuss the optimal design for an association mapping population and the need to fix the heterogeneous accessions to facilitate phenotyping and genotyping.

Experimental study of the saturation and the cross-magnetizing phenomenon in saturated synchronous machines

1988 ◽  
Vol 3 (4) ◽  
pp. 815-823 ◽  
Author(s):  
A.M. El-Serafi ◽  
A.S. Abdallah ◽  
M.K. El-Sherbiny ◽  
E.H. Badawy
Keyword(s):  
Experimental Study ◽  
Synchronous Machines ◽  
The Cross

scholarly journals Epistatic gene control on the yield of tomato at medium elevation in the tropical agroecosystem

2019 ◽  
Vol 20 (7) ◽  
Author(s):  
FAJAR PRAKOSO MAWASID ◽  
MUHAMAD SYUKUR ◽  
TRIKOESOEMANINGTYAS TRIKOESOEMANINGTYAS
Keyword(s):  
Flowering Time ◽  
Genetic Model ◽  
Fruit Weight ◽  
Gene Control ◽  
Harvest Time ◽  
Fruit Length ◽  
The Cross ◽  
Tropical Agroecosystem ◽  
Duplicate Epistasis ◽  
Fruit Diameter

Abstract. Mawasid FP, Syukur M, Trikoesoemaningtyas. 2019. Epistatic gene control on the yield of tomato at medium elevation in the tropical agroecosystem. Biodiversitas 20: 1880-1886. Cultivation of tomatoes on the middle-low plain generally decreases the quantity and quality of the yield due to high-temperature stress. Increasing the size and weight of lowland tomatoes is needed to enhance national production. Information on the action and genetic model of target characters is needed in the preparation of the assembly program, especially for selection needs. This study aims to obtain genetic information and heritability of tomato yield characters, as a basis for assembling large tomato varieties for the lowlands. The study was conducted using six populations (P1, P2, F1, BCP1, BCP2, and F2) resulting from two different crosses of 99D x Tora (C-I) and 97D x Tora (C-II). The results show that the action of non-additive genes and non-allelic interactions has a large value, with duplicate epistasis being more dominant than complementary epistasis. Duplicate epistasis was found in the character of harvest time, fruit length, fruit diameter, fruit weight in cross I and flowering time, harvest time, fruit length, fruit diameter, and number of fruits in cross II, while complementary epistasis was found in flowering time, fruit weight per plant, number of fruits in cross I, and fruit weight, fruit weight per plant in cross II. Moderate to high heritability was found in the character of fruit length, fruit diameter, fruit weight, and fruit weight per plant. The values are higher in population from the cross I (99D x Tora) for each character, indicating that the cross I has a higher potential for genetic progress than cross II. Selection is recommended when the homozygosity has increased, using the Bulk method or Single Seed Decent. The two methods above can maintain variability in the next generation, so epistasis genes that control target characters are not drastically eliminated.

scholarly journals EXPERIMENTAL STUDY ON RC BEAM SPECIMENS WITH CFRP ROD/MESH EMBEDDED AND INCREASING THICKNESS OF THE CROSS SECTION

2020 ◽  
Vol 73 (1) ◽  
pp. 348-354
Author(s):  
Shohei UEMURA ◽  
Kiyoshi MURAKAMI ◽  
Ayumi SATOH ◽  
Seiichiro YAMAUCHI
Keyword(s):  
Experimental Study ◽  
Cross Section ◽  
Rc Beam ◽  
The Cross
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