HOME >> BIOLOGY >> NEWS
Factors affecting kernel yield in maize

1-4 genes, were investigated by examining the impact of knock-out mutations on kernel yield. GS gene expression was impaired in the mutants, resulting in reduced levels of GS1 protein and activity. The gln1-4 phenotype displayed reduced kernel size whereas gln1-3 had reduced kernel number, and both phenotypes were evident in the gln1-3 gln1-4 double mutant. Shoot biomass production at maturity was not affected in either the single mutants or double mutants, suggesting that both gene products play a specific role in grain production. Levels of asparagine increased in the leaves of the mutants during grain filling, most likely as a mechanism for circumventing toxic ammonium buildup resulting from abnormally low GS1 activity. Phloem sap analysis revealed that, unlike glutamine, asparagine is not efficiently transported to developing maize kernels, which could account for the reduced kernel production in the mutants. Constitutive overexpression of Gln1-3 in maize leaves resulted in a 30% increase in kernel number relative to wild type, providing further evidence that GS1 plays a major role in kernel yield.

Some of the major cereals, such as maize, sorghum, and sugar cane, exhibit C4 photosynthesis, which enhances the efficiency of photosynthesis at high temperature (most C4 plants originated in tropical climates). In standard C3 photosynthesis (present in rice, wheat, and most temperate crop plants), CO2 entering the leaf is converted to a 3-carbon compound via the C3 pathway, utilizing energy derived from the light reactions of photosynthesis. In plants that have C4 photosynthesis, the C3 pathway enzymes are localized in specialized bundle sheath cells which surround the vascular tissue in the interior of the leaf. CO2 entering mesophyll cells at the leaf surface initially is converted to a 4-carbon compound, which is shuttled into the bundle sheath cells and then decarboxylated to release CO2. CO2 released into bundle sheath cells then enters the standard
'"/>

Contact: Nancy Eckardt
neckardt@aspb.org
970-495-9918
American Society of Plant Biologists
6-Dec-2006


Page: 1 2 3

Related biology news :

1. Impressive new Impact Factors for BioMed Centrals open-access journals
2. Creating new life forms that may help eradicate cancer affecting women
3. Kansas State study finds new vaccine effective against deadly viral disease affecting swine
4. UMass Lowell research shows benefits of apple juice on neurotransmitter affecting memory
5. CHAVI announces international search for genes affecting HIV response
6. More than drought affecting wheat yields
7. Lost forest yields several new species
8. Natures secrets yield new adhesive material
9. Sequencing method yields fuller picture
10. Modified mushrooms may yield human drugs
11. St. Jude study yields secrets of chromosome movement

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Factors affecting kernel yield maize

(Date:10/29/2014)... of its kind to date, researchers have used DNA ... risk for autism. Joseph Buxbaum, Ph.D., Icahn School of ... Ph.D., Broad Institute of Harvard and MIT, and their ... children, parents and unrelated people. They identified changes in ... risk for autism spectrum disorder (ASD) – a jump ...
(Date:10/29/2014)... and environmental, have been blamed for increasing the ... as a family history of schizophrenia, are widely ... gondii , a parasite transmitted by soil, undercooked ... skepticism. , A new study by Gary Smith, ... University of Pennsylvania,s School of Veterinary Medicine, used ...
(Date:10/29/2014)... Researching the safety of nanoparticles is all the rage. ... topic, examining the question of whether titanium dioxide nanoparticles ... into the body, whether carbon nanotubes from electronic products ... to be or whether nanoparticles in food can get ... Public interest is great, research funds are flowing – ...
Breaking Biology News(10 mins):Penn vet professor investigates parasite-schizophrenia connection 2Penn vet professor investigates parasite-schizophrenia connection 3Nanosafety research: The quest for the gold standard 2Nanosafety research: The quest for the gold standard 3
(Date:10/30/2014)... , Oct. 30, 2014  Regado Biosciences, Inc. ... will hold a conference call and live audio webcast ... to discuss its third quarter 2014 financial results. ... call by dialing (888) 347-1165 for domestic callers or ... be webcast live under the investor relations section of ...
(Date:10/27/2014)... The new research report, “Gas ... Medium), Sub-type (Primary & Secondary), and End-User (Transmission ... & Power Generation) - Trends and Forecasts to ... analysis and forecasting of the market size. , ... 52 Figures spread through 146 Pages and in-depth ...
(Date:10/27/2014)... October 27, 2014 The “Molecular ... Genetics, Microbiology), Technology (PCR, INAAT, DNA Sequencing), End ... Service, Software) - Global Forecast to 2018” provides ... challenges, opportunities, current market trends, and strategies impacting ... estimates and forecasts of the revenue and share ...
(Date:10/27/2014)... , Oct. 27, 2014 Pressure BioSciences, ... worldwide leader in the development and sale of ... sciences research market, today announced that Professor ... novel, accurate, highly reproducible, and robust method to ... high-throughput protein analysis on small needle biopsy samples ...
Breaking Biology Technology:Regado Biosciences to Provide Third Quarter 2014 Financial Results 2Gas Insulated Switchgear Market worth $21,951.9 Million by 2019 - New Report by MarketsandMarkets 2Gas Insulated Switchgear Market worth $21,951.9 Million by 2019 - New Report by MarketsandMarkets 3Gas Insulated Switchgear Market worth $21,951.9 Million by 2019 - New Report by MarketsandMarkets 4Global Molecular Diagnostics Market Will Reach $7.9 Billion by 2018 - New Research Report by MarketsandMarkets 2Global Molecular Diagnostics Market Will Reach $7.9 Billion by 2018 - New Research Report by MarketsandMarkets 3Global Molecular Diagnostics Market Will Reach $7.9 Billion by 2018 - New Research Report by MarketsandMarkets 4Global Molecular Diagnostics Market Will Reach $7.9 Billion by 2018 - New Research Report by MarketsandMarkets 5Breakthrough Method to Permit Quantification of Thousands of Proteins in Needle Biopsy Samples in 12 hours Presented at Major International Scientific Meeting; Method Enabled by Pressure BioSciences' PCT Sample Preparation Platform 2Breakthrough Method to Permit Quantification of Thousands of Proteins in Needle Biopsy Samples in 12 hours Presented at Major International Scientific Meeting; Method Enabled by Pressure BioSciences' PCT Sample Preparation Platform 3Breakthrough Method to Permit Quantification of Thousands of Proteins in Needle Biopsy Samples in 12 hours Presented at Major International Scientific Meeting; Method Enabled by Pressure BioSciences' PCT Sample Preparation Platform 4Breakthrough Method to Permit Quantification of Thousands of Proteins in Needle Biopsy Samples in 12 hours Presented at Major International Scientific Meeting; Method Enabled by Pressure BioSciences' PCT Sample Preparation Platform 5
Cached News: