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Related Concept Videos

Hybrid Zones02:29

Hybrid Zones

21.8K
Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.
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Hybridization of Atomic Orbitals I03:24

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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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Hybridization of Atomic Orbitals II03:35

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sp3d and sp3d 2 Hybridization
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In-situ Hybridization02:31

In-situ Hybridization

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In situ hybridization (ISH) is a technique used to detect and localize specific DNA or RNA molecules in cells, tissue, or tissue sections using a labeled probe. The technique was first used in 1969 for the investigation of nucleic acids. It is currently an essential tool in scientific research and clinical settings, especially for diagnostic purposes.
Types of probes and labels
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IR Absorption Frequency: Hybridization01:21

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Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
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Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

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According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
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Determination of the Absorption, Translocation, and Distribution of Imidacloprid in Wheat
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Hybrid wheat: past, present and future.

Pushpendra Kumar Gupta1, Harindra Singh Balyan2, Vijay Gahlaut2,3

  • 1Department of Genetics and Plant Breeding, Ch. Charan Singh University, Meerut, 250001, India. pkgupta36@gmail.com.

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Summary

Hybrid wheat varieties offer improved yield and quality, overcoming past failures through advanced male sterility techniques and heterotic group development. Ongoing research aims to make hybrid wheat commercially viable, addressing cost challenges for widespread adoption.

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Area of Science:

  • Agricultural Science
  • Plant Breeding
  • Genetics

Background:

  • Hybrid varieties enhance yield and quality in crops, but success in self-pollinated cereals like wheat has been limited compared to hybrid rice.
  • Previous attempts at hybrid wheat faced challenges, hindering widespread adoption despite potential benefits.

Purpose of the Study:

  • To review the progress, challenges, and future prospects of hybrid wheat production.
  • To detail novel technologies for male sterility and hybrid seed production in wheat.
  • To discuss the importance of heterotic groups and cost-effective seed production strategies.

Main Methods:

  • Review of existing literature on hybrid wheat development.
  • Description of cytoplasmic male sterility (CMS), CHA, and transgenic approaches for male sterility.
  • Exploration of Hordeum chilense-based CMS, chromosomal systems, and various transgenic technologies (e.g., barnase-barstar, split-barnase).
  • Analysis of heterotic quantitative trait loci (QTL) discovery and genomic prediction for hybrid vigor.

Main Results:

  • New hybrid wheat varieties with desirable traits have been developed and marketed in Europe.
  • Advanced male sterility systems, including transgenic approaches, offer new avenues for hybrid seed production.
  • Understanding and utilizing heterotic groups are crucial for successful hybrid wheat breeding.
  • Cost-effective hybrid seed production remains a key challenge, particularly concerning seed rates.

Conclusions:

  • Despite past setbacks, hybrid wheat shows renewed promise due to technological advancements in male sterility and breeding strategies.
  • Continued research into heterotic patterns, cost reduction, and efficient seed production is essential for the commercial success of hybrid wheat.
  • The integration of novel genetic and breeding technologies is paving the way for a more productive future for hybrid wheat.