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:


(Date:1/26/2017)... , Jan. 26, 2017  Crossmatch, a leading provider ... new solution aimed at combatting fraud, waste and abuse ... introduced at the Action on Disaster Relief conference in ... point for UN agencies and foreign assistance organizations throughout ... waste and abuse are a largely unacknowledged problem in ...
(Date:1/24/2017)... 24, 2017 Biopharm Reports has carried ... use of nuclear magnetic resonance spectroscopy (NMR). This ... profiled current practices, developments, trends and end-user plans ... growth and opportunities. These areas include growth in ... needs and innovation requirements, hyphenated NMR techniques, main ...
(Date:1/21/2017)... , Jan 20, 2017 Research and ... Biometrics Market 2017-2021" report to their offering. ... The global voice recognition biometrics ... 2017-2021. The report covers the present scenario and ... 2017-2021. To calculate the market size, the report considers the revenue ...
Breaking Biology News(10 mins):
(Date:2/23/2017)... ROCHESTER, Minn. , Feb. 23, 2017 /PRNewswire/ ... a new product line of oncolytic vaccinia viruses ... Genelux Corporation as part of Genelux,s proprietary, vaccinia ... "We are excited to enter into a partnership ... time, selected oncolytic vaccinia viruses for use in ...
(Date:2/23/2017)... ... 23, 2017 , ... The Greater Gift Initiative, Inc , (GGI) a ... Research . GGI's mission is to advance global health and highlight the greater good ... honor of each clinical trial volunteer. The vision of GGI is to serve as ...
(Date:2/22/2017)... Therapeutics, Inc. (NASDAQ: PETX), a pet therapeutics company focused on ... companion animals, will host a live conference call on Tuesday, ... results from the fourth quarter and full year ended December ... access the audio webcast or use the conference ... ...
(Date:2/22/2017)... ... February 22, 2017 , ... ... provider of women’s health, primary care, and specialty education, announced today it ... Education (ACCME). ACCME’s Accreditation with Commendation is a six-year accreditation and is ...
Breaking Biology Technology:
Cached News: