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:11/21/2014)... Calif. , Nov. 20, 2014   Atmel® ... leader in microcontroller (MCU) and touch technology solutions, today ... temperature sensors with the widest V cc ... higher temperature accuracy and faster I 2 C bus ... and serial EEPROM memory making them ideal for consumer, ...
(Date:11/15/2014)... YORK , Nov. 13, 2014  While we may ... technology Doctor McCoy used in "Star Trek" to gain instant ... tools designed to work with smartphones and tablets for monitoring ... of the healthcare world. This may seem a tad Orwellian ... ready to adopt some of these technological opportunities into their ...
(Date:11/7/2014)... 2014  In conjunction with the Glendale ... Community Foundation of the Verdugos has announced the " ... a $250,000 initiative to keep the Verdugo Regional Crime Lab ... six months of existence, the Lab has processed more than ... law enforcement. "Because our number one priority is ...
Breaking Biology News(10 mins):Atmel Launches Industry's First Wide-V(cc) Low-Power Temperature Sensor Family 2Atmel Launches Industry's First Wide-V(cc) Low-Power Temperature Sensor Family 3Atmel Launches Industry's First Wide-V(cc) Low-Power Temperature Sensor Family 4Americans May Be Ready for a Brave New World of Healthcare 2Americans May Be Ready for a Brave New World of Healthcare 3Americans May Be Ready for a Brave New World of Healthcare 4Community Foundation Of The Verdugos Unveils Campaign To Fund Glendale-Burbank DNA Justice Project 2
(Date:11/26/2014)... 25, 2014 SonaCare Medical, a ... (HIFU) devices, recently participated in the American Urology ... 360° .” Key opinion leaders in urology presented ... to small renal masses while attendees had the ... technologies in hands-on labs. Attendees at the Los ...
(Date:11/26/2014)... November 25, 2014 The Pittcon marketing ... official conference and exposition mobile app, ... download in the App Store for iOS and Android ... resource tool before, during and after the event. It ... on exhibiting companies, technical sessions, Conferee Networking sessions and ...
(Date:11/26/2014)... 2014 SoundConnect , an award ... to announce that Darren Suders has joined the team ... will drive the partner program through innovative ... , Darren brings more than 10-years of channel ... in channel operations, from policy development, to partner education ...
(Date:11/26/2014)... 25 novembre 2014 Theravalues Corporation est fier ... marché européen au salon Hi Europe 2014 (du ... ). Curcumine la plus biodisponible actuellement ... (non-cristalline) à des ingrédients approuvés par les règlements ... jaune présent dans la racine de curcuma ( ...
Breaking Biology Technology:SonaCare Medical Supports American Urology Association’s Small Renal Mass 360° Summit 2SonaCare Medical Supports American Urology Association’s Small Renal Mass 360° Summit 3Pittcon Releases 2015 Mobile App 2SoundConnect Appoints Director of Channel Development & Sales 2La curcumine présentant la plus haute biodisponibilité bientôt en vente en Europe 2La curcumine présentant la plus haute biodisponibilité bientôt en vente en Europe 3
Cached News: